{"id":57,"date":"2025-02-12T01:40:21","date_gmt":"2025-02-11T17:40:21","guid":{"rendered":"http:\/\/47.94.164.182\/wordpress\/?p=57"},"modified":"2025-03-03T20:02:37","modified_gmt":"2025-03-03T12:02:37","slug":"js%e5%ad%a6%e4%b9%a0%ef%bc%8c%e6%8c%81%e7%bb%ad%e6%9b%b4%e6%96%b0","status":"publish","type":"post","link":"https:\/\/codecraft.xin\/?p=57","title":{"rendered":"js\u5b66\u4e60\uff0c\u6301\u7eed\u66f4\u65b0~"},"content":{"rendered":"\n

\u521d\u8bc6JS<\/h1>\n\n\n\n

shift+alt+a\u591a\u884c\u6ce8\u91ca<\/p>\n\n\n\n

js\u7684\u8f93\u5165\u8f93\u51fa\uff1a<\/p>\n\n\n\n

prompt()\u8f93\u5165\u7684<\/p>\n\n\n\n

alert()\u8f93\u51fa\u7684\uff0c\u5c55\u793a\u7ed9\u7528\u6237\u7684<\/p>\n\n\n\n

console.log()\u63a7\u5236\u53f0\u663e\u793a<\/p>\n\n\n\n

js\u662f\u5f31\u8bed\u8a00\uff0c\u52a8\u6001\u8bed\u8a00\uff0c\u53d8\u91cf\u7684\u7c7b\u578b\u662f\u53ef\u4ee5\u53d8\u7684\uff0c\u6839\u636e\u53f3\u8fb9\u5177\u4f53\u7684\u503c\u6765\u53d8<\/p>\n\n\n\n

\u6bd4\u5982<\/p>\n\n\n\n

var x=10;\/\/\u6570\u5b57\u578b\nx='hello'\/\/\u53d8\u6210\u5b57\u7b26\u4e32\u578b\n\/\/\u8fd9\u79cd\u4e5f\u662f\u53ef\u4ee5\u7684\n<\/code><\/pre>\n\n\n\n
\u6570\u636e\u7c7b\u578b\u7684\u8f6c\u6362<\/p>\n\n\n\n
\u516b\u8fdb\u5236\u5c31\u662f\u5728\u6570\u5b57\u9762\u524d\u51990<\/p>\n\n\n\n
var num = 010;\nconsole.log(num);\n\/\/\u5c31\u662f8\n\/\/16\u8fdb\u5236\u5c31\u662f\uff0c\u524d\u9762\u52a00x\nvar num = 0x9;\/\/9\u5341\u8fdb\u5236\nvar num = 0xa;\/\/10\u5341\u8fdb\u5236\n<\/code><\/pre>\n\n\n\n
\u6570\u5b57\u578b\u6709\u6700\u5927\u503c\u548c\u6700\u5c0f\u503c<\/p>\n\n\n\n
\u7136\u540e\u8fd8\u6709\u4e09\u4e2a\u7279\u6b8a\u7684<\/p>\n\n\n\n
1.\u65e0\u7a77\u5927\uff08Infinity\uff09<\/p>\n\n\n\n
2.\u65e0\u7a77\u5c0f(-Infinity)<\/p>\n\n\n\n
3.NaN(\u975e\u6570\u503c)<\/p>\n\n\n\n
isNaA()\/\/\u8fd9\u4e2a\u65b9\u6cd5\u7528\u6765\u5224\u65ad\u975e\u6570\u5b57\uff0c\u5e76\u4e14\u8fd4\u56de\u4e00\u4e2a\u503c\uff0c\u5982\u679c\u662f\u6570\u5b57\uff0c\u8fd4\u56de\u7684\u662ffalse\uff0c\u5982\u679c\u4e0d\u662f\u6570\u5b57\uff0c\u8fd4\u56de\u7684\u662ftrue<\/p>\n\n\n\n
\u5b57\u7b26\u4e32\u578bString<\/p>\n\n\n\n
1.\u68c0\u6d4b\u5b57\u7b26\u4e32\u7684\u957f\u5ea6<\/p>\n\n\n\n
var str = 'zhangyujie';\nconsole.log(str.length);\n<\/code><\/pre>\n\n\n\n
2.\u5b57\u7b26\u4e32\u7684\u62fc\u63a5 +<\/p>\n\n\n\n
console.log('zhangyujie'+2.5);\/\/zhangyujie2.5\nconsole.log('zhangyujie'+'is good');\/\/ zhangyujieis good\nconsole.log('3'+2.5);\/\/32.5\nconsole.log(3+2.5);\/\/5.5\n<\/code><\/pre>\n\n\n\n
\u5e03\u5c14\u578b<\/p>\n\n\n\n
var flag = true;\nconsole.log(flag+1);\/\/\u4e3a2\n\/\/\u53c2\u52a0\u52a0\u6cd5\u8fd0\u7b97\uff0ctrue\u89c6\u4e3a1\uff0cfalse\u662f\u4e3a0\n<\/code><\/pre>\n\n\n\n
1.true<\/p>\n\n\n\n
2.false<\/p>\n\n\n\n
3.undefined<\/p>\n\n\n\n
4.null<\/p>\n\n\n\n
typeof\u7528\u6765\u68c0\u6d4b\u6570\u636e\u7c7b\u578b<\/p>\n\n\n\n
var num = 10;\nconsole.log(typeof num);\n<\/code><\/pre>\n\n\n\n
\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6d4f\u89c8\u5668\u63a7\u5236\u53f0\u7684\u989c\u8272\u6765\u5224\u65ad\u662f\u4ec0\u4e48\u7c7b\u578b\u7684<\/p>\n\n\n\n
\u6bd4\u5982\u5728\u84dd\u8272\u662f\u6570\u5b57\u578b\uff0c\u9ed1\u8272\u662f\u5b57\u7b26\u578b\uff0c\u6d45\u7070\u8272\u662f\u5e03\u5c14\u578b<\/p>\n\n\n\n
\u6570\u636e\u7c7b\u578b\u7684\u8f6c\u6362<\/p>\n\n\n\n
\u56e0\u4e3a\u5728\u8868\u5355\u548cprompt\u63a5\u6536\u5230\u7684\u6570\u636e\u90fd\u662f\u5b57\u7b26\u578b\uff0c\u9700\u8981\u6570\u5b57\u578b\u624d\u80fd\u8fdb\u884c\u64cd\u4f5c<\/p>\n\n\n\n
\u6570\u5b57\u578b\u8f6c\u6362\u4e3a\u5b57\u7b26\u578b<\/p>\n\n\n\n
1.toString()<\/p>\n\n\n\n
2.\u5229\u7528String()<\/p>\n\n\n\n
3.\u5229\u7528+\u62fc\u63a5\u5b57\u7b26\u4e32\u7684\u65b9\u6cd5(\u9690\u5f0f\u8f6c\u6362)<\/p>\n\n\n\n
        var num = 12;\n        var str = num.toString();\n        var str1= String(num);\n        console.log(num);\n        console.log(str1);\n        console.log(str);\n<\/code><\/pre>\n\n\n\n
\u5b57\u7b26\u578b\u8f6c\u6362\u4e3a\u6570\u5b57\u578b<\/p>\n\n\n\n
1.pareseInt()\u65b9\u6cd5\uff0c\u53d6\u6574\u6570\uff0c\u7136\u540e\u8fd8\u53ef\u4ee5\u76f4\u63a5\u53bb\u6389px\uff0c\u5982\u679c\u5f00\u5934\u662f\u5b57\u6bcd\u5c31\u4e0d\u80fd\u8f6c\u6362\u4e86<\/p>\n\n\n\n
        str = '123.56'\n        console.log(parseInt('23.5'));\/\/23\n        console.log(parseInt(str));\/\/123\n        console.log(parseInt('120px'));\/\/\u6253\u5370\u51fa120\n<\/code><\/pre>\n\n\n\n
2.parseFloat()\u65b9\u6cd5\uff0c\u53d6\u5c0f\u6570\u70b9\uff0c\u4e5f\u80fd\u53bb\u6389px<\/p>\n\n\n\n
3.Number()<\/p>\n\n\n\n
4.\u5229\u7528\u7b97\u6570\u8fd0\u7b97\uff0c-\uff0c*\uff0c\/\u9690\u5f0f\u8f6c\u6362<\/p>\n\n\n\n
console.log('12'-0)\/\/12\u6574\u6570\nconsole.log('12'-'1')\/\/11\n<\/code><\/pre>\n\n\n\n
\u7b2c\u4e8c\u5929\u770b\u8fd0\u7b97\u7b26<\/p>\n\n\n\n
\u8fd0\u7b97\u7b26<\/h1>\n\n\n\n
\/\u9664<\/p>\n\n\n\n
%\u4f59<\/p>\n\n\n\n
\u4f8b\uff1a3%5\u7ed3\u679c\u4e3a3<\/p>\n\n\n\n
\u6d6e\u70b9\u6570\u8fd0\u7b97\u91cc\u9762\u4f1a\u6709\u95ee\u9898,\u4f8b\u5982\uff0c\u89e3\u51b3\u65b9\u6cd5\u4ee5\u540e\u5b66\u4e60<\/p>\n\n\n\n
        console.log(0.1 + 0.2);\/\/0.30000000000000004\n        console.log(0.07 * 100 );\/\/7.000000000000001\n<\/code><\/pre>\n\n\n\n
\u6240\u4ee50.1+0.2\u4e0d\u7b49\u4e8e0.3<\/p>\n\n\n\n
\u4ee5\u540e\u8fdb\u884c\u8ba1\u7b97\uff0c\u907f\u5f00\u6d6e\u70b9\u6570\uff0c\u4f1a\u51fa\u73b0\u7cbe\u5ea6\u95ee\u9898\uff0c\u56e0\u4e3a\u4e8c\u8fdb\u5236\u7684\u8f6c\u6362<\/p>\n\n\n\n
\u8868\u8fbe\u5f0f\u548c\u8fd4\u56de\u503c<\/h2>\n\n\n\n
\u8868\u8fbe\u5f0f\u90fd\u4f1a\u6709\u4e2a\u8fd4\u56de\u503c\u7ed9\u6211\u4eec<\/p>\n\n\n\n
console.log('1+1')\/\/2\u5c31\u662f\u8fd4\u56de\u503c\uff0c1+1\u5c31\u662f\u8868\u8fbe\u5f0f\n<\/code><\/pre>\n\n\n\n
\u9012\u589e\u9012\u51cf\u8fd0\u7b97\u7b26<\/h2>\n\n\n\n
++\uff0c–\u5fc5\u987b\u5199\u5728\u53d8\u91cf\u7684\u524d\u9762\u6216\u8005\u540e\u9762\uff0c\u5982\u679c\u5355\u72ec\u4f7f\u7528\u6548\u679c\u4e00\u6837\uff0c\u5e76\u4e14\u8fd8\u4f1a\u6709\u4e9b\u533a\u522b<\/p>\n\n\n\n
\u524d\u7f6e\u9012\u589e\uff1a\u987a\u5e8f\u662f\uff0c\u5148\u52a01 \u540e\u8fd4\u56de\u503c<\/p>\n\n\n\n
\u540e\u7f6e\u9012\u589e\uff1a\u5148\u8fd4\u56de\u539f\u503c\uff0c\u540e\u81ea\u52a0,\u4f8b\u5982<\/p>\n\n\n\n
        var age =10;\n        console.log(age);\/\/10\n        console.log(age++ + 10);\/\/20\n        console.log(age);11\n<\/code><\/pre>\n\n\n\n
\/\/\u4f8b\u5b50\nvar e =10;\nvar f = e++ + ++e;\nconsole.log(f);\/\/22\n<\/code><\/pre>\n\n\n\n
\u6bd4\u8f83\u8fd0\u7b97\u7b26<\/h2>\n\n\n\n
\u9700\u8981\u6ce8\u610f\u7684\u662f<\/p>\n\n\n\n
==\u6709\u9ed8\u6570\u636e\u8f6c\u6362<\/p>\n\n\n\n
===\u5168\u7b49\uff0c\u5fc5\u987b\u4e00\u6a21\u4e00\u6837<\/p>\n\n\n\n
\u6bd4\u5982<\/p>\n\n\n\n
        console.log(18==18);\/\/true\n        console.log(18=='18');\/\/true\n        console.log(18==='18');\/\/false\n        console.log(18===18);\/\/true\n<\/code><\/pre>\n\n\n\n
\u903b\u8f91\u8fd0\u7b97\u7b26<\/h2>\n\n\n\n
&&\u4e0e<\/p>\n\n\n\n
||\u6216<\/p>\n\n\n\n
\uff01\u975e<\/p>\n\n\n\n
\u77ed\u8def\u8fd0\u7b97(\u903b\u8f91\u4e2d\u65ad)<\/h3>\n\n\n\n
\u5982\u679c\u5de6\u8fb9\u7684\u503c\u5df2\u7ecf\u786e\u5b9a\u7ed3\u679c\u4e86\uff0c\u5c31\u4e0d\u518d\u8ba1\u7b97\u53f3\u8fb9\u7684\u7ed3\u679c\u4e86<\/p>\n\n\n\n
&&\u5982\u679c\u5de6\u8fb9\u7684\u503c\u4e3a1\uff0c\u5c31\u5f97\u5230\u8868\u8fbe\u5f0f2\u7684\u503c\u4f5c\u4e3a\u7ed3\u679c<\/p>\n\n\n\n
\u5982\u679c\u8868\u8fbe\u5f0f\u4e3a\u5047\uff08\u5982\u679c\u6709\u7a7a\u6216\u8005\u5426\u5b9a\u4e3a\u5047\uff0c\u5176\u4f59\u90fd\u4e3a\u771f\uff0c0\uff0c” , null undefined NaN\uff09\uff0c\u5219\u8fd4\u56de\u5f0f\u4e3a\u5047false<\/p>\n\n\n\n
        console.log(123 && 456);\/\/456\n        console.log(0 && 456);\/\/0\n<\/code><\/pre>\n\n\n\n
\u903b\u8f91\u6216\u77ed\u8def\u8fd0\u7b97<\/p>\n\n\n\n
\u5982\u679c\u8868\u8fbe\u5f0f1\u7ed3\u679c\u4e3a\u771f\uff0c\u5219\u8fd4\u56de\u7684\u662f\u8868\u8fbe\u5f0f1 \u5982\u679c\u8868\u8fbe\u5f0f1 \u7ed3\u679c\u4e3a\u5047\uff0c\u5219\u8fd4\u56de\u8868\u8fbe\u5f0f2<\/p>\n\n\n\n
\u8d4b\u503c\u8fd0\u7b97\u7b26<\/h2>\n\n\n\n
=<\/p>\n\n\n\n
+=<\/p>\n\n\n\n
-=<\/p>\n\n\n\n
*=<\/p>\n\n\n\n
\/=<\/p>\n\n\n\n
\u8fd0\u7b97\u7b26<\/h2>\n\n\n\n
\u5c0f\u62ec\u53f7<\/p>\n\n\n\n
\u4e00\u5143\u8fd0\u7b97\u7b26<\/p>\n\n\n\n
\u7b97\u6570\u8fd0\u7b97\u7b26<\/p>\n\n\n\n
\u5173\u7cfb\u8fd0\u7b97\u7b26<\/p>\n\n\n\n
\u76f8\u7b49\u8fd0\u7b97\u7b26<\/p>\n\n\n\n
\u903b\u8f91\u8fd0\u7b97\u7b26<\/p>\n\n\n\n
\u8d4b\u503c\u8fd0\u7b97\u7b26<\/p>\n\n\n\n
\u9017\u53f7\u8fd0\u7b97\u7b26<\/p>\n\n\n\n
js\u6d41\u7a0b\u63a7\u5236<\/h1>\n\n\n\n
\u80fd\u591f\u4f7f\u7528if\u5206\u652f\u8bed\u53e5<\/h2>\n\n\n\n
#3 \u591a\u5206\u652f\u8bed\u53e5<\/p>\n\n\n\n
if<\/p>\n\n\n\n
else if<\/p>\n\n\n\n
\u5c31\u662f\u591a\u5206\u652f\u4e86<\/p>\n\n\n\n
\u5224\u65ad\u6210\u7ee9\u7684\u6848\u4f8b<\/p>\n\n\n\n
        var score = prompt(\"\u8bf7\u8f93\u5165\u5206\u6570\");\n        if (score >= 90) {\n            alert(\"\u4f18\u79c0\");\n        } else if (score >= 80) {\n            alert(\"\u826f\u597d\");\n        } else if (score >= 70) {\n            alert(\"\u4e2d\u7b49\");\n        } else if (score >= 60) {\n            alert(\"\u53ca\u683c\");\n        } else {\n            alert(\"\u4e0d\u53ca\u683c\");\n        }\n<\/code><\/pre>\n\n\n\n
\u4e09\u5143\u8868\u8fbe\u5f0f<\/h2>\n\n\n\n
\u8bed\u6cd5\u7ed3\u6784\uff1a\u6761\u4ef6\u8868\u8fbe\u5f0f?\u8868\u8fbe\u5f0f1:\u8868\u8fbe\u5f0f2<\/p>\n\n\n\n
\u6267\u884c\u601d\u8def\uff0c\u5982\u679c\u6761\u4ef6\u8868\u8fbe\u5f0f\u7ed3\u6784\u4e3a\u771f\uff0c\u5219\u8fd4\u56de\u8868\u8fbe\u5f0f1\u7684\u503c\uff0c\u5982\u679c\u4e3a\u5047\u5219\u8fd4\u56de\u8868\u8fbe\u5f0f2\u7684\u503c<\/p>\n\n\n\n
\u4f8b\u5b50\uff0c\u5c0f\u4e8e10\u5728\u524d\u9762\u88650<\/p>\n\n\n\n
        var score = prompt(\"\u8bf7\u8f93\u5165\u4e00\u4e2a\u6570\u5b57\");\n\t\tvar res;\n        res = score >=10?score:0+score;\n        console.log(res);\n<\/code><\/pre>\n\n\n\n
switch\u8bed\u53e5<\/h2>\n\n\n\n
switch(\u6761\u4ef6\u8868\u8fbe\u5f0f){\ncase value1:\n\t\u6267\u884c\u8bed\u53e51\uff1b\n\tbreak;\ncase value2:\n\t\u6267\u884c\u8bed\u53e52\uff1b\n\tbreak;\ndefault:\n\t\u6267\u884c\u8bed\u53e53\uff1b\n\tbreak;\n}\n<\/code><\/pre>\n\n\n\n
swtich\u91cc\u9762\u7684\u6761\u4ef6\u8868\u8fbe\u5f0f\uff0c\u4e00\u822c\u5199\u6210\u4e00\u4e2a\u53d8\u91cf<\/p>\n\n\n\n
num\u7684\u503c\u548ccase\u91cc\u9762\u7684\u503c\u76f8\u5339\u914d\u7684\u65f6\u5019\u5fc5\u987b\u662f\u5168\u7b49\uff0c\u5fc5\u987b\u7684\u503c\u6570\u636e\u7c7b\u578b\u4e00\u81f4\u624d\u53ef\u4ee5\u3002\u5c31\u662f===<\/p>\n\n\n\n
break\u6ca1\u8bf4\u4e00\u5b9a\u8981\u5199\uff0c\u4f46\u662f\u6700\u597d\u5199\uff0c\u5982\u679c\u5f53\u524d\u7684case\u91cc\u9762\u6ca1\u6709break\uff0c\u5219\u4e0d\u4f1a\u9000\u51faswitch\uff0c\u7ee7\u7eed\u6267\u884c\u4e0b\u4e00\u4e2acase<\/p>\n\n\n\n
switch(1){\ncase 1:\n\tconsole.log('1')\uff1b\ncase 2:\n\tconsole.log('2')\uff1b\ncase 3:\n\tconsole.log('3')\uff1b\n}\/\/\u8fd9\u6837\u4f1a\u628a1\uff0c2\uff0c3\u90fd\u6253\u5370\u51fa\u6765\n<\/code><\/pre>\n\n\n\n
if else\u548cswitch\u4e24\u4e2a\u4e00\u822c\u53ef\u4ee5\u76f8\u4e92\u66ff\u6362\u3002<\/p>\n\n\n\n
\u5982\u679c\u80fd\u786e\u5b9a\u503c\u7684\u60c5\u51b5\u4e0b\uff0c\u7528switch\u6bd4\u8f83\u5408\u9002\u3002<\/p>\n\n\n\n
\u5982\u679c\u662f\u8303\u56f4\u7684\u6e05\u7a7a\uff0cif else\u6bd4\u8f83\u5408\u9002\u3002<\/p>\n\n\n\n
\u5206\u652f\u591a\u7684\u65f6\u5019swtich\u6548\u7387\u4f1a\u66f4\u597d\u4e00\u4e9b\uff0c\u5206\u652f\u7ed3\u6784\u5c11\u7684\u65f6\u5019\uff0cif else\u6548\u7387\u66f4\u9ad8<\/p>\n\n\n\n
\u5faa\u73af\u7ed3\u6784<\/h1>\n\n\n\n
\u5faa\u73af\u7684\u76ee\u7684\uff1a\u53ef\u4ee5\u91cd\u590d\u6267\u884c\u67d0\u4e9b\u4ee3\u7801\uff0c\u8ba9\u7a0b\u5e8f\u66f4\u7b80\u5355\u66f4\u9ad8\u6548<\/p>\n\n\n\n
        for (var i=0;i<10;i++){\n            alert('\u6211\u9519\u4e86')\n        }\n<\/code><\/pre>\n\n\n\n
\u53e5\u6cd5\u7ed3\u6784\uff1a<\/h2>\n\n\n\n
1.for<\/h3>\n\n\n\n
\u5faa\u73af\u4f53\uff0c\u4e2d\u503c\u6761\u4ef6\uff0c\u4e00\u8d77\u7ec4\u6210\u5faa\u73af\u8bed\u53e5<\/p>\n\n\n\n
\/\/for\u5faa\u73af\u91cd\u590d\u6267\u884c\u67d0\u4e9b\u4ee3\u7801\uff0c\u901a\u5e38\u8ddf\u8ba1\u6570\uff0c\u6b21\u6570\u6709\u5173\u7cfb<\/p>\n\n\n\n
for (\u521d\u59cb\u5316\u53d8\u91cf;\u6761\u4ef6\u8868\u8fbe\u5f0f;\u64cd\u4f5c\u8868\u8fbe\u5f0f) {\n\t\u5faa\u73af\u4f53\uff1b\n}\n<\/code><\/pre>\n\n\n\n
\/\/\u6253\u5370100\u884c\u4f60\u597d\nfor (var i = 0; i<100;i++){\n    console.log('\u4f60\u597d');\n}\n<\/code><\/pre>\n\n\n\n
1-100\u7684\u7684\u7d2f\u52a0\u548c<\/p>\n\n\n\n
var sum = 0;\nfor (var i = 1; i<=100;i++){\n    sum +=i;\n}\nconsole.log(sum);\n<\/code><\/pre>\n\n\n\n
\u4e5d\u4e5d\u4e58\u6cd5\u8868<\/p>\n\n\n\n
        var str = ''\n        var res;\n        for (var row = 1;row<10;row++){\n            for (var col = 1;col<=row;col++){\n                res =col + \"*\" + row + \"=\" + col*row+\" \";\n                str +=res;\n                \n            }\n            str = str + '\\n';\n        }\n        console.log(str);\n\/* \n1*1=1 \n1*2=2 2*2=4 \n1*3=3 2*3=6 3*3=9 \n1*4=4 2*4=8 3*4=12 4*4=16 \n1*5=5 2*5=10 3*5=15 4*5=20 5*5=25 \n1*6=6 2*6=12 3*6=18 4*6=24 5*6=30 6*6=36 \n1*7=7 2*7=14 3*7=21 4*7=28 5*7=35 6*7=42 7*7=49 \n1*8=8 2*8=16 3*8=24 4*8=32 5*8=40 6*8=48 7*8=56 8*8=64 \n1*9=9 2*9=18 3*9=27 4*9=36 5*9=45 6*9=54 7*9=63 8*9=72 9*9=81 *\/\n<\/code><\/pre>\n\n\n\n
2.while<\/h3>\n\n\n\n
while(\u6761\u4ef6\u8868\u8fbe\u5f0f) {\n\/\/\u5faa\u73af\u4f53\n}\n\/\/\u6267\u884c\u601d\u8def \u5f53\u6761\u4ef6\u8868\u8fbe\u5f0f\u7ed3\u679c\u4e3atrue \u6267\u884c\u5faa\u73af\u4f53\uff0c\u5426\u5219\u9000\u51fa\u5faa\u73af\n<\/code><\/pre>\n\n\n\n
\u548cfor\u5faa\u73af\u5dee\u4e0d\u591a\uff0c\u5c0f\u5fc3\u6b7b\u5faa\u73af\uff0c\u4e00\u5b9a\u8981\u6709\u8ba1\u6570\u5668\u521d\u59cb\u5316\u53d8\u91cf\uff0c\u548c\u64cd\u4f5c\u8868\u8fbe\u5f0f<\/p>\n\n\n\n
3.do while<\/h3>\n\n\n\n
do {\n\/\/\u5faa\u73af\u4f53\n} while(\u6761\u4ef6\u8868\u8fbe\u5f0f){\n\/\/\u8981\u5148\u6267\u884c\u4e00\u6b21\u5faa\u73af\u4f53\uff0c\u518d\u6765\u5224\u65ad\u6761\u4ef6\uff0c\u5982\u679c\u6761\u4ef6\u5224\u65ad\u4e3a\u5047\n<\/code><\/pre>\n\n\n\n
4.continue<\/h3>\n\n\n\n
continue\u7ee7\u7eed\u8df3\u51fa\u672c\u6b21\u5faa\u73af\uff0c\u7ee7\u7eed\u4e0b\u4e00\u6b21\u5faa\u73af<\/p>\n\n\n\n
5.break<\/h3>\n\n\n\n
\u53ef\u4ee5\u9000\u51fa\u6574\u4e2a\u5faa\u73af\uff0c\u7acb\u9a6c\u5c31\u9000\u51fa<\/p>\n\n\n\n
\u6570\u7ec4<\/h1>\n\n\n\n
\u628a\u4e00\u7ec4\u6570\u636e\u5b58\u5728\u4e00\u4e2a\u53d8\u91cf\u4e0b\u3002\u662f\u4e00\u7ec4\u6570\u636e\u7684\u7ed3\u5408\u3002<\/p>\n\n\n\n
\u521b\u5efa\u6570\u7ec4<\/h2>\n\n\n\n
1.<\/p>\n\n\n\n
2.\u5229\u7528new\u5173\u952e\u5b57\u521b\u5efa\u6570\u7ec4<\/p>\n\n\n\n
var a = new Array();\/\/\u521b\u5efa\u4e00\u4e2a\u7a7a\u6570\u7ec4\n<\/code><\/pre>\n\n\n\n
3.\u5229\u7528\u6570\u7ec4\u5b57\u9762\u91cf\u521b\u5efa\u6570\u7ec4<\/p>\n\n\n\n
1.\u4f7f\u7528\u6570\u7ec4\u5b57\u9762\u91cf\u65b9\u5f0f\u521b\u5efa\u7a7a\u7684\u6570\u7ec4\nvar \u6570\u7ec4\u540d = [];\n2.\u4f7f\u7528\u6570\u7ec4\u5b57\u9762\u91cf\u65b9\u5f0f\u521b\u5efa\u5e26\u503c\u5f97\u6570\u7ec4\nvar \u6570\u7ec4\u540d = ['\u5c0f\u767d','\u5c0f\u9ed1','\u5c0f\u7ea2']\uff1b\/\/\u8fd9\u79cd\u65b9\u5f0f\u7528\u7684\u66f4\u52a0\u591a\uff0c\u6570\u7ec4\u91cc\u9762\u5f97\u6570\u636e\u4e00\u5b9a\u8981\u9017\u53f7\u5206\u9694\u3002\n<\/code><\/pre>\n\n\n\n
\u6570\u7ec4\u91cc\u9762\u5f97\u6570\u636e\u7684\u5143\u7d20\u7c7b\u578b\u662f\u4efb\u610f\u7684\u3002<\/p>\n\n\n\n
\u8bbf\u95ee\u6570\u7ec4\u5143\u7d20<\/h2>\n\n\n\n
1.\u6570\u7ec4\u7684\u7d22\u5f15\uff0c\u4e0b\u6807\uff0c\u7528\u6765\u8bbf\u95ee\u6570\u7ec4\u5143\u7d20\u7684\u5e8f\u53f7\u3002<\/p>\n\n\n\n
\u7d22\u5f15\u4ece0 \u5f00\u59cb<\/p>\n\n\n\n
\u4f7f\u7528\u65b9\u5f0f<\/p>\n\n\n\n
var a = [1,2,3] ;\nconsole.log(a[0]);\n<\/code><\/pre>\n\n\n\n
2.\u904d\u5386\u6570\u7ec4<\/p>\n\n\n\n
\u904d\u5386\uff1a\u628a\u6570\u7ec4\u6bcf\u4e00\u4e2a\u5143\u7d20\u4ece\u5934\u5230\u5c3e\u90fd\u8bbf\u95ee\u4e00\u6b21\u3002<\/p>\n\n\n\n
var a = [1,2,3] ;\nfor (var i=0 ; i<3 ; i++) {\n    console.log(a[i]);\n}\n<\/code><\/pre>\n\n\n\n
\u589e\u52a0\u6570\u7ec4\u5143\u7d20<\/h2>\n\n\n\n
1.\u65b0\u589e\u6570\u7ec4\u5143\u7d20\uff0c\u4fee\u6539length\u957f\u5ea6<\/h3>\n\n\n\n
var a = ['helo', 'world', 'this', 'is', 'a', 'test'];\na.length = 9\/\/\u8fd9\u6837\u591a\u51fa\u6765\u7684\u4e24\u4e2a\u5c31\u53d8\u4e3a\u7a7a\n<\/code><\/pre>\n\n\n\n
2.\u4fee\u6539\u6570\u7ec4\u7d22\u5f15<\/h3>\n\n\n\n
var arr1 = ['2','2','3','4'];\narr1[4]='5'\/\/\u8ffd\u52a0\u6570\u7ec4\u5143\u7d20\n\/\/\u5982\u679c\u7d22\u5f15\u7684\u5df2\u7ecf\u5b58\u5728\u4e86\uff0c\u5219\u4f1a\u88ab\u66ff\u6362\n<\/code><\/pre>\n\n\n\n
3.push\u8fd9\u4e2a\u65b9\u6cd5\u53ef\u4ee5\u589e\u52a0\u6570\u7ec4<\/h3>\n\n\n\n
var a = [];\nfor (var i = 0; i < 10; i++) {\n  a.push(i);\n}\nconsole.log(a);\/\/\u7ed9\u4e00\u4e2a\u7a7a\u6570\u7ec4\u5b58\u51651-9\u7684\u6570\n<\/code><\/pre>\n\n\n\n
4.\u5192\u6ce1\u7b97\u6cd5<\/h3>\n\n\n\n
\/\/\u628a\u4e00\u7cfb\u5217\u6570\u7ec4\u6309\u7167\u4e00\u5b9a\u7684\u6570\u636e\u6392\u5217\u663e\u793a\uff0c\u4ece\u5c0f\u5230\u5927\uff0c\u4ece\u5927\u5230\u5c0f\n\/\/\u4e00\u6b21\u6bd4\u8f83\u4e24\u4e2a\u5143\u7d20\uff0c\u5982\u679c\u987a\u5e8f\u9519\u8bef\u5c31\u4ea4\u6362\nvar a = [5,4,3,2,1];\nfor (var i = 0; i < a.length-1; i++) {\n    for(var j=0; j < a.length-i-1; j++) {\n        if(a[j] > a[j+1]) {\n            if (a[j] > a[j+1]) {\n                var temp = a[j];\n                a[j] = a[j+1];\n                a[j+1] = temp;\n            } \n        }\n    }\n}\nconsole.log(a);\n<\/code><\/pre>\n\n\n\n
\u51fd\u6570<\/h1>\n\n\n\n
\u51fd\u6570\u662f\u5c01\u88c5\u4e86\u4e00\u6bb5\u91cd\u590d\u6267\u884c\u8c03\u7528\u7684\u4ee3\u7801\u5757\uff0c\u76ee\u7684\u662f\u8ba9\u5927\u91cf\u7684\u4ee3\u7801\u91cd\u590d\u4f7f\u7528<\/p>\n\n\n\n
\u51fd\u6570\u7684\u4f7f\u7528<\/h2>\n\n\n\n
1.\u51fd\u6570\u7684\u58f0\u660e<\/h3>\n\n\n\n
function \u51fd\u6570\u540d() {\n\t\u51fd\u6570\u4f53\n}\n\/\/function \u58f0\u660e\u51fd\u6570\u7684\u5173\u952e\u5b57\u5168\u90e8\u5c0f\u5199\n\/\/\u51fd\u6570\u540d\u4e00\u822c\u662f\u52a8\u8bcd\n\/\/\u51fd\u6570\u4e0d\u8c03\u7528\uff0c\u81ea\u5df1\u4e0d\u6267\u884c\n<\/code><\/pre>\n\n\n\n
2.\u51fd\u6570\u7684\u8c03\u7528<\/h3>\n\n\n\n
\u8c03\u7528\u51fd\u6570\u7684\u65f6\u5019\u8981\u52a0\u5c0f\u62ec\u53f7\u3002\nfunction hanshu\uff08\uff09{\n    console.log('\u51fd\u6570')\n}\nhanshu();\n<\/code><\/pre>\n\n\n\n
3.\u5e26\u53c2\u6570\u7684\u51fd\u6570<\/h3>\n\n\n\n
function \u51fd\u6570\u540d(\u5f62\u53c21\uff0c\u5f62\u53c22\u3002\u3002\u3002){\n\n}\n\u51fd\u6570\u540d(\u5b9e\u53c21\uff0c\u5b9e\u53c22....)\n\/\/\u5f62\u53c2\u53ef\u4ee5\u63a5\u6536\u5b9e\u53c2\uff0c\u51fd\u6570\u7684\u53c2\u6570\u53ef\u4ee5\u6709\uff0c\u4e5f\u53ef\u4ee5\u6ca1\u6709\uff0c\u4e0d\u9650\u4e2a\u6570\n<\/code><\/pre>\n\n\n\n
js\u91cc\u9762\u7684\u5f62\u53c2\u548c\u5b9e\u53c2\u4e0d\u5339\u914d\u4e5f\u6ca1\u4e8b<\/p>\n\n\n\n
function helo(num1,num2){\n var res = num1+num2;\n console.log(res);\n}\nhelo(1,2);\/\/\u6b63\u5e38\u60c5\u51b5\uff0c\u7ed3\u679c\u4e3a3\nhelo(1);\/\/\u4e00\u4e2a\u5b9e\u53c2\uff0c\u591a\u4f59\u7684\u5f62\u53c2\u5b9a\u4e49\u4e3aundefined\uff0c\u6700\u7ec8\u7684\u7ed3\u679c\u4e3aNaN\nhelo(1,2,3);\/\/\u4e09\u4e2a\u5b9e\u53c2,\u8fd8\u662f3\n\/\/\u5c3d\u91cf\u76f8\u5339\u914d\n<\/code><\/pre>\n\n\n\n
4.\u51fd\u6570\u7684\u8fd4\u56de\u503c<\/h3>\n\n\n\n
\u8f93\u51fa\u8bed\u53e5\u4e00\u5b9a\u8981\u8fd4\u56de\uff0c\u51fd\u6570\u5185\u90e8\u4e00\u5b9a\u4e0d\u8981\u6709\u8f93\u51fa\u8bed\u53e5\u3002<\/p>\n\n\n\n
\u7528return\u6765\u5b9e\u73b0<\/p>\n\n\n\n
function hanshu(){\n\u51fd\u6570\u4f53\nreturn \u9700\u8981\u8fd4\u56de\u7684\u7ed3\u679c;\n}\n\/\/\u53ea\u8981\u51fd\u6570\u9047\u5230return \u5c31\u628a\u540e\u9762\u7684\u7ed3\u679c\u8fd4\u56de\u51fd\u6570\u7684\u8c03\u7528\u8005 \u51fd\u6570\u540d()=return \u540e\u9762\u7684\u7ed3\u679c\n<\/code><\/pre>\n\n\n\n
\u4ee3\u7801\u9a8c\u8bc1<\/p>\n\n\n\n
function cook(){\nreturn 666;\n}\ncook();\nconsole.log(cook());\n<\/code><\/pre>\n\n\n\n
return \u7ec8\u6b62\u51fd\u6570<\/h2>\n\n\n\n
return\u8bed\u53e5\u540e\u9762\u7684\u4ee3\u7801\u4e0d\u4f1a\u6267\u884c<\/p>\n\n\n\n
function helo(num1,num2){\n var res = num1+num2;\n    return res;\n    alert('\u6211\u4e0d\u4f1a\u6267\u884c');\n}\nhelo(1,2);\n<\/code><\/pre>\n\n\n\n
return\u53ea\u80fd\u8fd4\u56de\u4e00\u4e2a\u503c\nreturn num1,num2;\/\/\u8fd4\u56de\u7684\u662fnum2\n\u4f46\u662f\u5982\u679c\u60f3\u8fd4\u56de\u591a\u4e2a\u503c\uff0c\u5c31\u628a\u7ed3\u679c\u5199\u8fdb\u6570\u7ec4\uff0c\u8fd4\u56de\u6570\u7ec4\u5c31\u53ef\u4ee5\u4e86\nreturn [num1,num2];\n<\/code><\/pre>\n\n\n\n
\u51fd\u6570\u5982\u679c\u6709return\uff0c\u5219\u8fd4\u56dereturn\u540e\u9762\u7684\u503c\uff0c\u5982\u679c\u6ca1\u6709return\uff0c\u5219\u8fd4\u56deundefined<\/strong><\/p>\n\n\n\n
return:\u4e0d\u4ec5\u53ef\u4ee5\u9000\u51fa\u5faa\u73af\uff0c\u8fd8\u53ef\u4ee5\u7ed3\u675f\u51fd\u6570\u7684\u4ee3\u7801<\/p>\n\n\n\n
break\u5c31\u4e0d\u884c\uff0c\u53ea\u80fd\u9000\u51fa\u5faa\u73af<\/p>\n\n\n\n
\u5224\u65ad\u662f\u5426\u662f\u8d28\u6570<\/h3>\n\n\n\n
var num = Number(prompt(\"Enter a number: \"));\nfunction number(num){\n    for(var i=2;i<num;i++){\n       if(num%i==0){\n           return(\"Not a prime number\");\n       }\n       \n}\nreturn \"Prime number\";\n}\n\nconsole.log(number(num));\n<\/code><\/pre>\n\n\n\n
agruments\u7684\u4f7f\u7528<\/h2>\n\n\n\n
agruments\u91cc\u9762\u5b58\u50a8\u4e86\u6240\u6709\u5b9e\u53c2<\/p>\n\n\n\n
agruments\u5c55\u793a\u65b9\u5f0f\u662f\u4e00\u4e2a\u4f2a\u6570\u7ec4\u3002(\u5177\u6709\u6570\u7ec4\u7684length\u5c5e\u6027\uff0c\u6309\u7167\u7d22\u5f15\u53f7\u8fdb\u884c\u5b58\u50a8\uff0c\u4ed6\u6ca1\u6709\u771f\u6b63\u6570\u7ec4\u7684\u4e00\u4e9b\u65b9\u6cd5\uff0c\u6bd4\u5982push,pop\u7b49)<\/p>\n\n\n\n
\u53ea\u6709\u51fd\u6570\u624d\u6709arguments\uff0c\u6bcf\u4e2a\u51fd\u6570\u90fd\u5185\u7f6e\u597d\u4e86\u7684<\/p>\n\n\n\n
function test() {\n  console.log(arguments);\n}\ntest(1, 2, 3); \/\/ { '0': 1, '1': 2, '2': 3 }\/\/Arguments(3) [1, 2, 3, callee: \u0192, Symbol(Symbol.iterator): \u0192]\n<\/code><\/pre>\n\n\n\n
\\\\\u4f7f\u7528agruments\u6765\u83b7\u53d6\u6700\u5927\u503c\nfunction getMax(){\n    var max = 0;\n    for (var i = 0; i < arguments.length; i++){\n        if (arguments[i] > max){\n            max = arguments[i];\n        }\n    }\n    return max;\n}\nconsole.log(getMax(1, 2, 3)); \/\/ 5\nconsole.log(getMax(5, 4, 3, 2, 1)); \/\/ 5\nconsole.log(getMax(11, 22, 43, 25, 44)); \/\/ 5\n<\/code><\/pre>\n\n\n\n
\u5229\u7528\u51fd\u6570\u5c01\u88c5\u7684\u65b9\u6cd5\uff0c\u6765\u7ffb\u8f6c\u6570\u7ec4<\/p>\n\n\n\n
function reverse(arr) {\n    var newarr = [];\n    for (var i = arr.length - 1; i >= 0; i--) {\n        newarr.push(arr[i]);\n    }\n    return newarr;\n\n}\nvar arr1  = reverse([1,2,3,45]);\nconsole.log(arr1);\n\\\\\u7ed3\u679c[45, 3, 2, 1]\n<\/code><\/pre>\n\n\n\n
js\u7684\u9884\u7f16\u8bd1\u673a\u5236<\/h1>\n\n\n\n
\u5c31\u662f\u76f8\u5f53\u4e8e\uff0c\u5728\u6267\u884cjs\u8bed\u53e5\u7684\u65f6\u5019\uff0c\u4f1a\u5148\u7f16\u8bd1\u518d\u6267\u884c<\/p>\n\n\n\n
\u7136\u540e\u5177\u4f53\u7684\u7ec6\u8282\u5c31\u662f\uff0c\u5148\u5c06\u9047\u5230\u7684var \u53d8\u91cf\u548c\u51fd\u6570\u58f0\u660e\u7ed9\u653e\u5230\u4f5c\u7528\u57df\u7684\u524d\u9762\u518d\u8fdb\u884c\u8d4b\u503c\u3002<\/p>\n\n\n\n
\/\/\u4f8b\u5b50\nvar num = 10;\nfunction fn1 (){\n\tvar num1 = 1;\n\tconsole.log(num1);\n}\n\/\/\u9884\u7f16\u8bd1\u7684\u673a\u5236\u5982\u4e0b\nvar num;\nfunction fn1 (){\n\tvar num1;\n\tnum1 = 1;\n\tconsole.log(num1);\n}\nnum = 10;\n<\/code><\/pre>\n\n\n\n
\u5bf9\u8c61<\/h1>\n\n\n\n
\u521b\u5efa\u5bf9\u8c61\u7684\u4e09\u79cd\u65b9\u5f0f<\/h2>\n\n\n\n
\u65b9\u5f0f1\uff1a<\/h3>\n\n\n\n
var test = new Object();\nconsole.log(test); \/\/ true\n<\/code><\/pre>\n\n\n\n
\u65b9\u5f0f2\uff1a<\/h3>\n\n\n\n
var test = {\n    age : 18,\n    name : 'zhangsan',\n}\nconsole.log(test.age);\n<\/code><\/pre>\n\n\n\n
\u65b9\u5f0f3\uff1a\u5229\u7528\u6784\u9020\u51fd\u6570\u521b\u5efa\u5bf9\u8c61<\/h3>\n\n\n\n
\u4f18\u70b9\u5c31\u662f\uff0c\u80fd\u591f\u6279\u91cf\u7684\u521b\u5efa\u5bf9\u8c61\uff0c\u7c7b\u4f3cpython\u4e2d\u95f4\u7684\u7c7b\u548c\u5b9e\u4f8b\u5316\u5bf9\u8c61\u3002\u6784\u9020\u51fd\u6570\u521b\u5efa\u7c7b\u548c\u51fd\u6570\u7684\u65b9\u6cd5\uff0c\u5c31\u53ea\u6709 \u5728\u51fd\u6570\u91cc\u9762\u591a\u4e86\u4e00\u4e2athis\u6765\u786e\u4fdd\u662f\u5728\u8fd9\u4e2a\u7c7b\uff0c\u7136\u540e\u8c03\u7528\u5bf9\u8c61\u51fd\u6570\u5fc5\u987b\u4f7f\u7528new\u3002<\/strong><\/p>\n\n\n\n
\/\/\u628a\u76f8\u540c\u7684\u5c5e\u6027\uff1a\u76f8\u540c\u7684\u65b9\u6cd5\n\/\/\u6784\u9020\u51fd\u6570\u7684\u8bed\u6cd5\u683c\u5f0f\nfunction \u6784\u9020\u51fd\u6570\u540d(){\nthis.\u5c5e\u6027 = \u503c\uff1b\n    this.\u65b9\u6cd5 = function() {\n      \n    }\n}\nnew \u6784\u9020\u51fd\u6570\u540d\n<\/code><\/pre>\n\n\n\n
function Star(uname,age,sex){\n    this.uname = uname;\n    this.age = age;\n    this.sex = sex;\n    }\nlet zs = new Star('\u5f20\u4e09',18,'\u7537');\/\/\u6784\u9020\u51fd\u6570\u4e0d\u9700\u8981return\uff0c\u5c31\u80fd\u8fd4\u56de\u4e00\u4e2a\u5bf9\u8c61\nconsole.log(zs);\/\/Star {uname: '\u5f20\u4e09', age: 18, sex: '\u7537'}\nconsole.log(typeof zs);\/\/\u5f97\u5230object\uff0c\u8bf4\u660e\u5c31\u662f\u4e00\u4e2a\u5bf9\u8c61\n<\/code><\/pre>\n\n\n\n
\/\/\u521b\u5efa\u7f51\u7ad9\u82f1\u96c4\u5bf9\u8c61\nfunction hero(age,type,blood,attack){\n    this.age = age;\n    this.type = type;\n    this.blood = blood;\n    this.attack = attack;\n    this.attack = function(){\n        console.log(\"attack\");\n    }\n    this.defend = function(){\n        console.log(\"defend\");\n    }\n    this.move = function(){\n        console.log(\"move\");\n    }\n};\nvar luna = new hero('\u9732\u5a1c','\u6253\u91ce','10000','\u6cd5\u523a');\nvar houyi = new hero('\u540e\u88d4','\u53d1\u80b2\u8def','5000','\u5c04\u624b');\nconsole.log(luna);\n<\/code><\/pre>\n\n\n\n
\u6784\u9020\u51fd\u6570\u6cdb\u6307\u67d0\u4e00\u5927\u7c7b\uff0c\u7c7b\u4f3cjava\u91cc\u9762\u7684\u7c7bclass<\/strong><\/p>\n\n\n\n
\u5bf9\u8c61\u6307\u7684\u662f\u4e00\u4e2a\u5177\u4f53\u7684\u5b9e\u4f8b\uff0c\u6bd4\u5982\u9732\u5a1c\uff0c\u5218\u4ea6\u83f2\u3002<\/strong><\/p>\n\n\n\n
\u6240\u4ee5\u901a\u8fc7new\u521b\u5efa\u5bf9\u8c61\u7684\u8fc7\u7a0b\u4e5f\u88ab\u79f0\u4e3a\u5bf9\u8c61\u7684\u5b9e\u4f8b\u5316\u3002<\/strong><\/p>\n\n\n\n
new\u5173\u952e\u5b57\u7684\u6267\u884c\u8fc7\u7a0b<\/p>\n\n\n\n
1.\u5728\u5185\u5b58\u4e2d\u521b\u5efa\u4e86\u4e00\u4e2a\u7a7a\u7684\u5bf9\u8c61\u3002<\/p>\n\n\n\n
2.\u8ba9this\u6307\u5411\u8fd9\u4e2a\u65b0\u7684\u5bf9\u8c61\u3002<\/p>\n\n\n\n
3.\u6267\u884c\u6784\u9020\u51fd\u6570\u91cc\u9762\u7684\u4ee3\u7801\uff0c\u8ba9\u5bf9\u8c61\u6dfb\u52a0\u5c5e\u6027\u548c\u65b9\u6cd5\u3002<\/p>\n\n\n\n
4.\u8fd4\u56de\u8fd9\u4e2a\u5bf9\u8c61\uff08\u6240\u4ee5\u6784\u9020\u51fd\u6570\u4e0d\u9700\u8981return\uff09<\/p>\n\n\n\n
\u904d\u5386\u5bf9\u8c61<\/h2>\n\n\n\n
var obj = {\n    name:'xiaozhang',\n    age :'18',\n    sex:'famle'\n    fn1:function(){\n\t}\n}\n\/\/for in\u904d\u5386\u5bf9\u8c61\n\/* for (\u53d8\u91cf in \u5bf9\u8c61){\n\n} *\/\nfor(var k in obj){\n    console.log(k);\/\/k\u53d8\u91cf\u8f93\u51fa\u7684\u662f\u5c5e\u6027\u540d\n    console.log(obj[k]);\/\/obj[k]\u8f93\u51fa\u7684\u662f\u5c5e\u6027\u503c\n}\n<\/code><\/pre>\n\n\n\n
\u4f7f\u7528for in \u91cc\u9762\u7684\u53d8\u91cf\uff0c\u6211\u4eec\u559c\u6b22\u5199k \u6216\u8005 key<\/p>\n\n\n\n
\u9879\u76ee\u5c0f\u4f5c\u4e1a-\u7b80\u6613\u8ba1\u7b97\u5668<\/h2>\n\n\n\n
var a = prompt('1.\u52a0\u6cd5\u8fd0\u7b97\\n2.\u51cf\u6cd5\u8fd0\u7b97\\n3.\u4e58\u6cd5\u8fd0\u7b97\\n4.\u9664\u6cd5\u8fd0\u7b97\\n5.\u9000\u51fa\\n\u8bf7\u8f93\u5165\u4f60\u7684\u9009\u9879');\n\nfunction add() {\n    var a = parseFloat(prompt('\u8bf7\u8f93\u5165\u7b2c\u4e00\u4e2a\u6570\u5b57'));\n    var b = parseFloat(prompt('\u8bf7\u8f93\u5165\u7b2c\u4e8c\u4e2a\u6570\u5b57')); \n    return a + b;\n}\n\nfunction sub() {\n    var a = parseFloat(prompt('\u8bf7\u8f93\u5165\u7b2c\u4e00\u4e2a\u6570\u5b57'));\n    var b = parseFloat(prompt('\u8bf7\u8f93\u5165\u7b2c\u4e8c\u4e2a\u6570\u5b57')); \n    return a - b;\n}\n\nfunction mul() {\n    var a = parseFloat(prompt('\u8bf7\u8f93\u5165\u7b2c\u4e00\u4e2a\u6570\u5b57'));\n    var b = parseFloat(prompt('\u8bf7\u8f93\u5165\u7b2c\u4e8c\u4e2a\u6570\u5b57')); \n    return a * b;\n}\n\nfunction div() {\n    var a = parseFloat(prompt('\u8bf7\u8f93\u5165\u7b2c\u4e00\u4e2a\u6570\u5b57'));\n    var b = parseFloat(prompt('\u8bf7\u8f93\u5165\u7b2c\u4e8c\u4e2a\u6570\u5b57')); \n    return a \/ b;\n}\n\nif (a == 1) {\n    alert(add());\n} else if (a == 2) {\n    alert(sub());\n} else if (a == 3) {\n    alert(mul());\n} else if (a == 4) {\n    alert(div());\n} else if (a == 5) {\n    alert('\u9000\u51fa');\n}\n<\/code><\/pre>\n\n\n\n
\u6548\u679c\uff1a<\/p>\n\n\n\n\n\n
\u5185\u7f6e\u5bf9\u8c61<\/h1>\n\n\n\n
js\u91cc\u9762\u7684\u5bf9\u8c61\u5206\u4e3a\u4e09\u7c7b\uff1a\u81ea\u5b9a\u4e49\u5bf9\u8c61\uff0c\u5185\u7f6e\u5bf9\u8c61\uff0c\u6d4f\u89c8\u5668\u5bf9\u8c61<\/p>\n\n\n\n
\u524d\u4e24\u79cd\u662fjs\u7684\u57fa\u7840\u5185\u5bb9\uff0c\u7b2c\u4e09\u4e2a\u662fjs\u72ec\u6709<\/p>\n\n\n\n
\u6587\u6863\u67e5\u8be2\uff08MDN\uff09\u5fd8\u8bb0\u5c31\u53bb\u67e5<\/h2>\n\n\n\n
Math\u5bf9\u8c61<\/h2>\n\n\n\n
math\u5bf9\u8c61\u4e0d\u662f\u4e00\u4e2a\u6784\u9020\u5668\uff0c\u4e0d\u9700\u8981new\uff0c\u5c5e\u6027\u548c\u65b9\u6cd5\u662f\u9759\u6001\u7684\uff0c\u76f4\u63a5\u4f7f\u7528\u5c31\u53ef\u4ee5\u4e86<\/p>\n\n\n\n
console.log(Math.PI); \/\/ 3.141592653589793\nconsole.log(Math.max(1,4,2)); \/\/4\n<\/code><\/pre>\n\n\n\n
\u5c01\u88c5\u81ea\u5df1\u7684\u6570\u5b66\u5bf9\u8c61<\/h3>\n\n\n\n
var myMath = {\n    PI :3.14159265359,\n    MAX : function () {\n        var max = arguments[0];\n        for (var i = 1; i < arguments.length; i++) {\n            if (arguments[i] > max) {\n                max = arguments[i];\n            }\n        }\n        return max;\n    }\n}\nconsole.log(myMath.MAX(1, 2, 3, 4, 5)); \/\/ 5\n<\/code><\/pre>\n\n\n\n
Math.random()\u8fd4\u56de\u4e00\u4e2a\u968f\u673a\u5c0f\u6570(0<=x<1)<\/p>\n\n\n\n
\u65b9\u6cd5\u91cc\u9762\u4e0d\u8ddf\u53c2\u6570<\/p>\n\n\n\n
\u4ee3\u7801\u9a8c\u8bc1<\/p>\n\n\n\n
console.log(Math.random());\/\/0.6026389167533179\n<\/code><\/pre>\n\n\n\n
\/\/\u751f\u6210\u4e00\u5b9a\u8303\u56f4\u7684\u6574\u6570\u968f\u673a\u6570\nfunction getrandNumber(min , max) {\n  return Math.floor(Math.random() * (max - min + 1)) + min;\n}\nconsole.log(getrandNumber(1, 10)); \/\/ 1-10 aras\u0131 rastgele say\u0131 \u00fcretir\n<\/code><\/pre>\n\n\n\n
\u731c\u6570\u5b57\u7684\u6848\u4f8b<\/p>\n\n\n\n
\\\\\u731c\u6570\u5b57\u7684\u6848\u4f8b\nfunction getrandNumber(min , max) {\n  return Math.floor(Math.random() * (max - min + 1)) + min;\n}\nvar random = getrandNumber(1, 10);\nwhile (true) {\/\/\u6b7b\u5faa\u73af\nvar num = prompt(\"\u8bf7\u8f93\u5165\u4e00\u4e2a1-10\u7684\u6570\u5b57\uff1a\");\nif (num > random) {\n  alert(\"\u5927\u4e86\");}\n  else if (num < random) {\n    alert(\"\u5c0f\u4e86\");\n  } else {\n    alert(\"\u731c\u5bf9\u4e86\");\n    break;\n}\n}\n<\/code><\/pre>\n\n\n\n
\u65e5\u671f\u5bf9\u8c61<\/h2>\n\n\n\n
Date\u5b9e\u4f8b\u9700\u8981\u4f7f\u7528\u8c03\u7528Date\u6784\u9020\u51fd\u6570\uff0c\u5fc5\u987b\u4f7f\u7528new\u6765\u8c03\u7528<\/p>\n\n\n\n
var date = new Date();\nconsole.log(date);\/\/Thu Feb 13 2025 21:27:07 GMT+0800 (\u4e2d\u56fd\u6807\u51c6\u65f6\u95f4)\n<\/code><\/pre>\n\n\n\n
\u5982\u679cDate\u6ca1\u6709\u53c2\u6570\uff0c\u8fd4\u56de\u7cfb\u7edf\u7684\u5f53\u524d\u65f6\u95f4<\/p>\n\n\n\n
\u52a0\u53c2\u6570<\/p>\n\n\n\n
var date = new Date(2025,10,1);\nvar date = new Date('2025-10-1');\nconsole.log(date);\n<\/code><\/pre>\n\n\n\n
\u8fd4\u56de\u5f53\u524d\u7684\u5e74\uff0c\u6708<\/p>\n\n\n\n
var date = new Date();\nconsole.log(date.getFullYear());\/\/2025\nconsole.log(date.getMonth()+1);\/\/2\n<\/code><\/pre>\n\n\n\n
\u83b7\u53d6\u65f6\u671f\u7684\u603b\u6beb\u79d2\u7684\u5f62\u5f0f<\/p>\n\n\n\n
Date\u83b7\u5f97\u603b\u7684\u6beb\u79d2\u6570(\u65f6\u95f4\u6233)\uff0c\u4ece1970\u5e741\u6708\u5230\u73b0\u5728<\/p>\n\n\n\n
var date = new Date();\nconsole.log(date.getTime());\nconsole.log(date.valueOf());\nvar date1 = +new Date();\nconsole.log(date1);\nconsole.log(Date.now());\n<\/code><\/pre>\n\n\n\n
\u5012\u8ba1\u65f6\u65f6\u95f4\u6848\u4f8b<\/h3>\n\n\n\n
function countDown(time){\n    var nowtime = +new Date();\n    var inputtime = +new Date(time);\n    var times = (inputtime - nowtime)\/1000;\n    var d = parseInt(times\/60\/60\/24);\n    d = d<10 ? '0'+d : d;\n    var h = parseInt(times\/60\/60%24);\n    h = h<10 ? '0'+h : h;\n    var m = parseInt(times\/60%60);\n    m = m<10 ? '0'+m : m;\n    var s = parseInt(times%60);\n    s = s<10 ? '0'+s : s;\n    return d+'\u5929'+h+'\u5c0f\u65f6'+m+'\u5206\u949f'+s+'\u79d2';\n}\nconsole.log(countDown('2025-2-13 22:05:00'));\n<\/code><\/pre>\n\n\n\n
\u5176\u4ed6\u77e5\u8bc6\u70b9\uff0c\u5c31\u67e5mdn\u5427<\/p>\n\n\n\n
\u6570\u7ec4\u5bf9\u8c61<\/h2>\n\n\n\n
Array();<\/p>\n\n\n\n
\u6dfb\u52a0\u5220\u9664\u6570\u7ec4\u65b9\u6cd5<\/p>\n\n\n\n
push\u65b9\u6cd5<\/h3>\n\n\n\n
push\u65b9\u6cd5\u53ef\u4ee5\u7ed9\u6570\u7ec4\u8ffd\u52a0\u65b0\u7684\u5143\u7d20<\/p>\n\n\n\n
push\uff08\uff09\u53c2\u6570\u76f4\u63a5\u5199\u6570\u7ec4\u5143\u7d20\u5c31\u53ef\u4ee5\u3002<\/p>\n\n\n\n
push()\u5b8c\u6bd5\u7684\u8fd4\u56de\u503c\u662f\u65b0\u6570\u7ec4\u7684\u957f\u5ea6<\/p>\n\n\n\n
\u539f\u6570\u7ec4\u4e5f\u4f1a\u53d1\u751f\u53d8\u5316\uff0c\u9ed8\u8ba4\u5728\u539f\u6570\u7ec4\u7684\u672b\u5c3e\u6dfb\u52a0<\/p>\n\n\n\n
unshift\u5bf9\u8c61<\/h3>\n\n\n\n
\u5728\u6570\u7ec4\u5f00\u5934\u6dfb\u52a0<\/p>\n\n\n\n
arr = [1,2,3,4];\narr.unshift('5');\nconsole.log(arr);\n<\/code><\/pre>\n\n\n\n
\u5176\u4ed6\u7684\u5c5e\u6027\u548cpush\u5bf9\u8c61\u5dee\u4e0d\u591a<\/p>\n\n\n\n
pop\u5bf9\u8c61<\/h3>\n\n\n\n
\u5220\u9664\u6570\u7ec4\u6700\u540e\u4e00\u4e2a\u5143\u7d20\uff0c\u4e00\u6b21\u53ea\u80fd\u5220\u9664\u4e00\u4e2a\u3002<\/p>\n\n\n\n
\u4e5f\u6709\u8fd4\u56de\u503c\uff0c\u4f60\u5220\u9664\u54ea\u4e2a\u5143\u7d20\uff0c\u4ed6\u5c31\u8fd4\u56de\u54ea\u4e2a\u5143\u7d20\u3002<\/p>\n\n\n\n
pop\u91cc\u9762\u4e0d\u8ddf\u53c2\u6570<\/p>\n\n\n\n
shift\u5bf9\u8c61<\/h3>\n\n\n\n
\u5220\u9664\u6570\u7ec4\u7684\u7b2c\u4e00\u4e2a\u5bf9\u8c61\uff0c\u4e00\u6b21\u53ea\u80fd\u5220\u9664\u4e00\u4e2a\uff0c\u4e5f\u6ca1\u6709\u53c2\u6570<\/p>\n\n\n\n
\u5176\u4ed6\u8ddfpop\u5dee\u4e0d\u591a<\/p>\n\n\n\n
\u6570\u7ec4\u6392\u5e8f<\/h3>\n\n\n\n
1.\u7ffb\u8f6c\u6570\u7ec4<\/p>\n\n\n\n
reverse()\u76f4\u63a5\u5c31\u53ef\u4ee5\u7ffb\u8f6c\u4e86\u3002<\/p>\n\n\n\n
var arr = [1500,1200,2000,2100,1800];\narr.reverse();\nconsole.log(arr);\n<\/code><\/pre>\n\n\n\n
2.\u6570\u7ec4\u6392\u5e8f(\u5192\u6ce1\u6392\u5e8f)<\/p>\n\n\n\n
\/\/\u5f53\u6570\u7ec4\u4e2d\u7684\u503c\u90fd\u5c0f\u4e8e10\u7684\u65f6\u5019\uff0c\u5192\u6ce1\u6392\u5e8f\u76f4\u63a5\u7528sort\u65b9\u6cd5\u5c31\u53ef\u4ee5\u5b9e\u73b0\nvar arr = [3,1,2,5];\narr.sort();\nconsole.log(arr);\/\/ [1, 2, 3, 5]\n<\/code><\/pre>\n\n\n\n
\u5982\u679c\u4ed6\u7684\u503c\u662f\u6709\u4e24\u4f4d\u6570\u6216\u8005\u4e09\u4f4d\u6570\u7684\u5316\u5c31\u4e0d\u80fd<\/p>\n\n\n\n
var arr = [13,4,77,1,7];\narr.sort();\nconsole.log(arr);\n\/\/[1, 13, 4, 7, 77]\n<\/code><\/pre>\n\n\n\n
\u8fd9\u79cd\u60c5\u51b5\u7684\u89e3\u51b3\u65b9\u6cd5\uff0c\u6709\u4e2a\u5f88\u56fa\u5b9a\u7684\u65b9\u6cd5\uff0c\u5728sort\uff08\uff09\u65b9\u6cd5\u91cc\u9762\u518d\u5199\u4e00\u4e2a\u51fd\u6570<\/p>\n\n\n\n
var arr = [13,4,77,1,7];\narr.sort(function(a,b){\n    return a-b;\/\/\u5347\u5e8f\n    \/\/return b-a;\/\/\u964d\u5e8f\n});\nconsole.log(arr);\n\/\/[1, 4, 7, 13, 77]\n<\/code><\/pre>\n\n\n\n
\u6570\u7ec4\u7684\u7d22\u5f15\u65b9\u6cd5<\/h3>\n\n\n\n
indexOf();\/\/\u7684\u4f7f\u7528\u65b9\u6cd5<\/p>\n\n\n\n
var arr = [13,4,77,1,7];\nconsole.log(arr.indexOf(77)); \/\/ 2\n<\/code><\/pre>\n\n\n\n
\u5047\u5982\u6570\u7ec4\u91cc\u9762\u6709\u4e24\u4e2a\u76f8\u540c\u7684\u503c\uff0c\u8fd4\u56de\u7b2c\u4e00\u4e2a\u7b26\u5408\u7684\u7d22\u5f15\uff0c\u5982\u679c\u6570\u7ec4\u91cc\u9762\u6ca1\u6709\u60f3\u8981\u7684\u503c\uff0c\u5c31\u8fd4\u56de\u7d22\u5f15\u4e3a-1<\/p>\n\n\n\n
var arr = [13,4,77,1,7];\nconsole.log(arr.indexOf(2)); \/\/ -1\n<\/code><\/pre>\n\n\n\n
lastIndexOf()\u4ece\u540e\u9762\u5f00\u59cb\u67e5\u627e\uff0c\u4f46\u662f\u7d22\u5f15\u53f7\u8fd8\u662f\u4ece\u5de6\u5f80\u53f3\u6392\u5e8f\u3002<\/p>\n\n\n\n
\u6848\u4f8b\u6570\u7ec4\u53bb\u91cd<\/h3>\n\n\n\n
\u6838\u5fc3\u7b97\u6cd5\uff0c\u904d\u5386\u65e7\u6570\u7ec4\uff0c\u5982\u679c\u65b0\u6570\u7ec4\u91cc\u9762\u6ca1\u6709\u8fd9\u4e2a\u5143\u7d20\uff0c\u5c31\u5b58\u8fdb\u53bb\uff0c\u6709\u7684\u5316\u5c31\u4e0d\u5b58\u4e86<\/p>\n\n\n\n
function unique(arr){\n    var newarr = [];\n    for (var i = 0; i < arr.length;i++){\n        if (newarr.indexOf(arr[i]) == -1){\n            newarr.push(arr[i]);\n        }\n    }\n    return newarr;\n}\nvar res =  unique([1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0]); \/\/ [1,2,3,4,5,6,7,8,9,0]\nconsole.log(res);\/\/ [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]\n<\/code><\/pre>\n\n\n\n
\u6570\u7ec4\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32<\/h3>\n\n\n\n
1.toString()<\/p>\n\n\n\n
var str = ['1', '2', '3', '4', '5'];\nconsole.log(str.toString());\/\/1,2,3,4,5\n<\/code><\/pre>\n\n\n\n
2,join()\u91cc\u9762\u53ef\u4ee5\u8ddf\u5206\u9694\u7b26<\/p>\n\n\n\n
\u91cc\u9762\u5982\u679c\u6ca1\u52a0\u53c2\u6570\uff0c\u5c31\u9ed8\u8ba4\u4ee5\u9017\u53f7\u5206\u9694<\/p>\n\n\n\n
var str = ['1', '2', '3', '4', '5'];\nconsole.log(str.join());\/\/1,2,3,4,5\nconsole.log(str.join('-'));\/\/1-2-3-4-5\n<\/code><\/pre>\n\n\n\n
\u5176\u4ed6\u6570\u7ec4\u5bf9\u8c61<\/h3>\n\n\n\n
concat()\u8fde\u63a5\u4e24\u4e2a\u6570\u7ec4<\/p>\n\n\n\n
\u57fa\u672c\u5305\u88c5\u7c7b\u578b<\/h2>\n\n\n\n
\u6839\u636e\u524d\u9762\u7684\u7406\u8bba\uff0c\u5c5e\u6027\u548c\u65b9\u6cd5\u662f\u5728\u5bf9\u8c61\u4e0a\u624d\u6709\u7684\uff0c\u800c\u7b80\u5355\u7684\u6570\u636e\u7c7b\u578b\u4e0d\u5177\u6709\u5c5e\u6027\u548c\u65b9\u6cd5\u624d\u5bf9\uff0c\u5b57\u7b26\u4e32\u5c5e\u4e8e\u7b80\u5355\u6570\u636e\u7c7b\u578b\uff0c\u4f46\u662f\u4e5f\u6709length\u5c5e\u6027\uff0c\u662f\u56e0\u4e3a\u6709\u57fa\u672c\u5305\u88c5\u7c7b\u578b\uff1a\u628a\u7b80\u5355\u7684\u6570\u636e\u7c7b\u578b\u5305\u88c5\u6210\u590d\u6742\u7684\u6570\u636e\u7c7b\u578b\u3002<\/p>\n\n\n\n
1.\u628a\u7b80\u5355\u7684\u6570\u636e\u7c7b\u578b\u5305\u88c5\u4e3a\u590d\u6742\u7684\u6570\u636e\u7c7b\u578b<\/p>\n\n\n\n
var temp = new String(‘andy’);<\/p>\n\n\n\n
2.\u628a\u4e34\u65f6\u904d\u5386\u7684\u503c\u7ed9str<\/p>\n\n\n\n
str= temp<\/p>\n\n\n\n
3.\u9500\u6bc1\u8fd9\u4e2a\u4e34\u65f6\u53d8\u91cf<\/p>\n\n\n\n
temp = null<\/p>\n\n\n\n
\u5b57\u7b26\u4e32\u4e0d\u53d8\u6027<\/h2>\n\n\n\n
\u6307\u7684\u5b57\u7b26\u4e32\u4e0d\u4f1a\u968f\u610f\u6539\u53d8\uff0c\u4e5f\u4e0d\u8981\u968f\u610f\u62fc\u63a5\u5b57\u7b26\u4e32<\/p>\n\n\n\n
\u6839\u636e\u5b57\u7b26\u8fd4\u56de\u4f4d\u7f6e<\/h2>\n\n\n\n
\u548c\u6570\u7ec4\u7684\u65b9\u6cd5\u5dee\u4e0d\u591aindexOf()<\/p>\n\n\n\n
str.indexOf(‘\u8981\u67e5\u627e\u7684\u5b57\u7b26’,[\u8d77\u59cb\u7684\u4f4d\u7f6e])<\/p>\n\n\n\n
var str = '\u6539\u9769\u6625\u98ce\u5439\u6ee1\u5730\uff0c\u6625\u5929\u6765\u4e86'\/\/\u60f3\u627e\u7b2c\u4e8c\u4e2a\u6625\nconsole.log(str.indeOf('\u6625',[3]))\n<\/code><\/pre>\n\n\n\n
\u67e5\u627e\u5b57\u7b26\u4e32”abcdoefoxyozzopp”\u4e2do\u51fa\u73b0\u7684\u4f4d\u7f6e\u4ee5\u53ca\u6b21\u6570<\/p>\n\n\n\n
var str = 'abcdoefoxyozzopp';\nvar num = 0;\nvar index = str.indexOf('o');\nwhile(index !== -1){\n    console.log(index);\n    num++;\n    index = str.indexOf('o',[index+1]);\n    \n}\nconsole.log(num);\n<\/code><\/pre>\n\n\n\n
\/\/\u67e5\u627e\u6570\u7ec4\nvar arr = [\n    'pink',\n    'red',\n    'green',\n    'grew',\n    'pink'\n];\nvar num=0;\nvar index = arr.indexOf('pink');\nwhile(index !== -1){\n    console.log(index);\n    num++;\n    index = arr.indexOf('pink',index+1)\n}\nconsole.log(num);\n<\/code><\/pre>\n\n\n\n
webAPIs<\/h1>\n\n\n\n
\u524d\u9762\u5b66\u7684js\u662f\u57fa\u7840\u8bed\u6cd5\uff0cwebapi\u662fjs\u7684\u8fd0\u7528\uff0c\u53ef\u4ee5\u505a\u4ea4\u4e92\u3002<\/p>\n\n\n\n
API<\/h2>\n\n\n\n
API\u5c31\u662f\u4e00\u4e9b\u9884\u5b9a\u7684\u51fd\u6570\uff0c\u63d0\u4f9b\u5e94\u7528\u7a0b\u5e8f\u4e0e\u5f00\u53d1\u4eba\u5458\u57fa\u4e8e\u67d0\u79cd\u8f6f\u4ef6\u6216\u786c\u4ef6\u4ee5\u8bbf\u95ee\u4e00\u7ec4\u4f8b\u7a0b\u7684\u80fd\u529b\uff0c\u76f8\u5f53\u4e8e\u662f\u4e00\u79cd\u5de5\u5177\uff0c\u65b9\u4fbf\u7f16\u7a0b\u3002<\/p>\n\n\n\n
webapi\u592a\u591a\u4e86\uff0c\u5b66\u4e60\u4e3b\u8981\u7684\u5c31\u884c\uff0c\u7136\u540e\u4ee5\u540e\u9700\u8981\u7528\u5230\u7684\u5c31\u67e5webapi\u7684\u53c2\u8003\u6587\u6863\u3002<\/p>\n\n\n\n
DOM<\/h2>\n\n\n\n
\u6587\u6863\u5bf9\u8c61\u6a21\u578b\uff0c\u662f\u4e00\u4e2a\u63a5\u53e3\u7528\u6765\u5904\u7406html,xml\u3002<\/p>\n\n\n\n
document\u6587\u6863<\/p>\n\n\n\n
element\u5143\u7d20<\/p>\n\n\n\n
id<\/p>\n\n\n\n
getElementById(‘time’);<\/h3>\n\n\n\n
\u56e0\u4e3a\u6587\u6863\u9875\u9762\u662f\u4ece\u4e0a\u5f80\u4e0b\u52a0\u8f7d\u7684\uff0c\u6240\u4ee5\u5fc5\u987b\u73b0\u6709\u53d8\u8fc1\uff0c\u518d\u7528script\u5199\u5230\u6807\u7b7e\u7684\u4e0b\u9762<\/p>\n\n\n\n
\u53c2\u6570id\u662f\u5927\u5c0f\u5199\u654f\u611f\u7684\u5b57\u7b26\u4e32<\/p>\n\n\n\n
\u8fd4\u56de\u7684\u662f\u4e00\u4e2adom\u7c7b\u578b\u7684\u5bf9\u8c61<\/p>\n\n\n\n
<!DOCTYPE html>\n<html lang=\"zh-cn\">\n<head>\n    <meta charset=\"UTF-8\">\n    <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n    <title>Document<\/title>>\n<\/head>\n<body>\n    <div id=\"time\">19.50<\/div>\n    <script>\n        var time = document.getElementById('time');\n        console.log(time);\n        console.log(typeof time);\n        console.dir(time);  \/\/\u6253\u5370\u6211\u4eec\u8fd4\u56de\u7684\u5bf9\u8c61\u5143\u7d20\uff0c\u66f4\u597d\u7684\u67e5\u770b\u91cc\u9762\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u3002\n        <\/script>\n<\/body>\n<\/html>\n<\/code><\/pre>\n\n\n\n
getElementsByTagName()<\/h3>\n\n\n\n
\u8fd9\u4e2a\u65b9\u6cd5\u53ef\u4ee5\u8fd4\u56de\u5e26\u6709\u6307\u5b9a\u6807\u7b7e\u540d\u7684\u5bf9\u8c61\u7684\u96c6\u5408\u3002<\/p>\n\n\n\n
<body>\n    <li>1<\/li>\n    <li>1<\/li>\n    <li>1<\/li>\n    <li>15<\/li>\n    <li>124<\/li>\n    <li>12\/li>\n    <li>3<\/li>\n    <script>\n        var lis = document.getElementsByTagName('li');\n        console.dir(lis);  \n        <\/script>\n <\/body>\n\/\/\u8fd4\u56de\u7684\u662f\u83b7\u53d6\u5bf9\u8c61\u7684\u96c6\u5408\uff0c\u4ee5\u4f2a\u6570\u7ec4\u7684\u5f62\u52bf\u5b58\u8d2e\u7684\n<\/code><\/pre>\n\n\n\n
\u904d\u5386\u4f2a\u6570\u7ec4\u91cc\u9762\u7684\u5143\u7d20<\/p>\n\n\n\n
    <li>1<\/li>\n    <li>1<\/li>\n    <li>1<\/li>\n    <li>15<\/li>\n    <li>124<\/li>\n    <li>12\/li>\n    <li>3<\/li>\n    <script>\n        var lis = document.getElementsByTagName('li');\n        console.dir(lis); \n        for (var i = 0; i < lis.length; i++) {\n            console.log(lis[i]);\n            }\n        \n        <\/script>\n<\/code><\/pre>\n\n\n\n
\u5982\u679c\u9875\u9762\u53ea\u6709\u4e00\u4e2a\u5143\u7d20\uff0c\u8fd4\u56de\u7684\u8fd8\u662f\u4f2a\u6570\u7ec4\u3002<\/p>\n\n\n\n
\u5982\u679c\u9875\u9762\u4e00\u4e2a\u90fd\u6ca1\u6709\uff0c\u5c31\u8fd4\u56de\u7a7a\u7684\u4f2a\u6570\u7ec4\u3002<\/p>\n\n\n\n
\u5feb\u6377\u952e\uff0calt+shift+\u6846\u9009\uff0c\u53ef\u4ee5\u540c\u65f6\u6539\u591a\u4e2a<\/strong><\/p>\n\n\n\n
\u8fd8\u53ef\u4ee5\u83b7\u53d6\u67d0\u4e2a\u5143\u7d20\u5185\u90e8\u6240\u6709\u6307\u5b9a\u6807\u7b7e\u7684\u5b50\u5143\u7d20<\/p>\n\n\n\n
element.getElementsByTagName(‘\u6807\u7b7e\u540d’)\uff1b<\/p>\n\n\n\n
\u7236\u5143\u7d20\u5fc5\u987b\u662f\u5355\u4e2a\u5bf9\u8c61\uff0c\u5fc5\u987b\u6307\u660e\u662f\u54ea\u4e2a\u5143\u7d20\u5bf9\u8c61\u3002\u83b7\u53d6\u7684\u65f6\u5019\u4e0d\u5305\u62ec\u7236\u5143\u7d20\u81ea\u5df1\u3002<\/p>\n\n\n\n
H5\u7684\u83b7\u53d6\u5143\u7d20\u7684\u65b9\u6cd5<\/h3>\n\n\n\n
1.getElementsByClassName()\u6839\u636e\u7c7b\u540d\u83b7\u53d6\u67d0\u4e9b\u5143\u7d20\u7684\u96c6\u5408<\/p>\n\n\n\n
    <li class=\"li\">1<\/li>\n    <li>3<\/li>\n    <li>3<\/li>\n    <li>3<\/li>\n    <div id ='idtest'>\u65e0\u8bed<\/div>\n    <script>\n        var lis = document.getElementsByClassName('li');\n        console.log(lis);\n        var query = document.querySelector('.li');\n        var id1 = document.querySelector('#idtest');\n        console.log(query);\n        console.log(id1);\n        <\/script>\n \u7ed3\u679c\uff1a\n<\/code><\/pre>\n\n\n\n\n\n
2.\u6ce8\u610fquerySelector\u8fd4\u56de\u6307\u5b9a\u9009\u62e9\u5668\u7684\u7b2c\u4e00\u4e2a\u5143\u7d20\u5bf9\u8c61\uff0c\u9009\u62e9id\u8981\u5728idname\u524d\u9762\u52a0#\uff0c\u7c7b\u9009\u62e9\u7684\u5316\u8981\u5728classname\u524d\u9762\u52a0.\uff08\u5207\u8bb0\u91cc\u9762\u7684\u9009\u62e9\u5668\u4e00\u5b9a\u8981\u52a0\u7b26\u53f7\uff09<\/p>\n\n\n\n
3.querySelectAall()\u53ef\u4ee5\u5f97\u5230\u6240\u6709\u7684li\uff0c\u6bd4querySelector\u66f4\u597d\u70b9\uff0c\u66f4\u7b80\u5355\u70b9\u3002<\/p>\n\n\n\n
    <li class=\"li\">1<\/li>\n    <li class=\"li\">3<\/li>\n    <li class=\"li\">3<\/li>\n    <li>3<\/li>\n    <div id ='idtest'>\u65e0\u8bed<\/div>\n    <script>\n\n        var query = document.querySelectorAll('.li');\n        console.log(query);\n        <\/script\n<!-- NodeList(3) [li.li, li.li, li.li]\n0\n: \nli.li\n1\n: \nli.li\n2\n: \nli.li\nlength\n: \n3\n[[Prototype]]\n: \nNodeList -->\n<\/code><\/pre>\n\n\n\n
\u83b7\u53d6\u7279\u6b8a\u5143\u7d20<\/h3>\n\n\n\n
    <script>\n\n        \/\/1.\u83b7\u53d6body\u5143\u7d20\n        var body = document.body;\n        \/\/2.\u83b7\u53d6html\u5143\u7d20\n        var html = document.documentElement;\n        console.log(body);\n        console.log(html);\n        \n        <\/script\n<\/code><\/pre>\n\n\n\n
\u4e8b\u4ef6\u57fa\u7840<\/h2>\n\n\n\n
\u4e8b\u4ef6\u7531\u4e09\u90e8\u5206\u7ec4\u6210 \u4e8b\u4ef6\u6e90 \u4e8b\u4ef6\u7c7b\u578b \u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f \u79f0\u4e3a\u4e8b\u4ef6\u4e09\u8981\u7d20<\/p>\n\n\n\n
<button id = 'bind'>\u70b9\u6211<\/button>\n<script>\n    var things = document.getElementById('bind');\n    things.onclick = function(){\n        alert('hello');\n\n    }   \n    \/\/\u8fd9\u662f\u4e00\u4e2a\u70b9\u51fb\u4e8b\u4ef6\u7684\u4f8b\u5b50\n<\/code><\/pre>\n\n\n\n
\u6267\u884c\u4e8b\u4ef6\u7684\u8fc7\u7a0b<\/h3>\n\n\n\n
\u4e00\u4e2adiv\u5143\u7d20\uff0c\u70b9\u6211\u63a7\u5236\u53f0\u5c31\u4f1a\u663e\u793a\u6211\u88ab\u70b9\u51fb<\/p>\n\n\n\n
<div class = 'bind'>123<\/div>\n<script>\nvar div = document.querySelector('.bind');  \ndiv.onclick = function(){\n    console.log('\u6211\u88abclick');\n}\n<\/script>\n<\/code><\/pre>\n\n\n\n
\u64cd\u4f5c\u5143\u7d20<\/h3>\n\n\n\n
element.innerText<\/p>\n\n\n\n
\u4ece\u8d77\u59cb\u4f4d\u7f6e\u5230\u7ec8\u6b62\u4f4d\u7f6e\u7684\u5185\u5bb9\uff0c\u4f46\u662f\u5b83\u53bb\u9664html\u6807\u7b7e\uff0c\u540c\u65f6\u7a7a\u683c\u548c\u6362\u884c\u4e5f\u4f1a\u53bb\u6389<\/p>\n\n\n\n
element.innerHTML<\/p>\n\n\n\n
\u8d77\u59cb\u4f4d\u7f6e\u548c\u7ec8\u6b62\u4f4d\u7f6e\u7684\u5168\u90e8\u5185\u5bb9\uff0c\u5305\u62echtml\u6807\u7b7e\uff0c\u540c\u65f6\u4fdd\u7559\u7a7a\u683c\u548c\u6362\u884c<\/p>\n\n\n\n
\u6848\u4f8b\uff0c\u70b9\u51fb\u53ef\u4ee5\u83b7\u53d6\u5f53\u524d\u7cfb\u7edf\u4e8b\u4ef6\uff0c\u653e\u5230div\u91cc\u9762\u53bb\u3002<\/p>\n\n\n\n
<script>\n    var value1= document.getElementById('bind');\n    var value2= document.getElementById('bind1');\n    value1.onclick = function(){\n        value2.innerText = new Date().toLocaleString();\n    }\n<\/script>\n<\/code><\/pre>\n\n\n\n
innertext\u4e0d\u8bc6\u522bhtml\u6807\u7b7e\uff0cinnerhtml\u8bc6\u522b\u6807\u7b7e<\/p>\n\n\n\n
innerHTML\u7528\u7684\u6bd4\u8f83\u591a\uff08w3\u6807\u51c6\uff09<\/p>\n\n\n\n
        <button id=\"tu1\" title=\"tu1\">\u56fe\u4e00<\/button>\n        <button id=\"tu2\" title=\"tu2\">\u56fe\u4e8c<\/button>\n        <div>\n            <img src=\"images\/1.jpg\" >\n        <\/div>\n        <script >\n            document.getElementById('tu1').onclick = function(){\n                document.querySelector('img').src = 'images\/1.jpg';\n                document.querySelector('img').title = 'tu1';\n            }\n            document.getElementById('tu2').onclick = function(){\n                document.querySelector('img').src = 'images\/2.jpg';\n                document.querySelector('img').title = 'tu2';\n            }\n        <\/script>\n<\/code><\/pre>\n\n\n\n
\u6848\u4f8b \u5206\u65f6\u663e\u793a\u4e0d\u540c\u7684\u56fe\u7247\uff0c\u663e\u793a\u4e0d\u540c\u7684\u95ee\u5019\u8bed<\/p>\n\n\n\n
<p>\u65e9\u4e0a\u597d<\/p>\n<img src=\"images\/1.jpg\" alt=\"\" title=\"tu1\">\n<script>\n    var p = document.querySelector('p');\n    var img = document.querySelector('img');\n    var time = new Date().getHours();\n    if (time < 12){\n        p.innerHTML = '\u65e9\u4e0a\u597d';\n        img.src = 'images\/1.jpg';\n        img.title = 'tu1';\n    }\n    else{\n        p.innerHTML = '\u665a\u4e0a\u597d';\n        img.src = 'images\/2.jpg';\n        img.title = 'tu2';\n    }\n\n<\/script>\n<\/code><\/pre>\n\n\n\n
dom\u64cd\u4f5c\u8868\u5355\u5143\u7d20<\/h3>\n\n\n\n
<button>\u70b9\u51fb<\/button>\n<input type=\"text\" value=\"\u8f93\u5165\u5185\u5bb9\">\u3001\n<script>\nlet btn = document.querySelector('button');\nlet input = document.querySelector('input');\nbtn.onclick = function(){\n    input.value = '\u70b9\u51fb\u4e86\u6309\u94ae';\n    this.disable = true;\n}\n<\/code><\/pre>\n\n\n\n
\u8fd9\u91cc\u7528\u7684input.value\u800c\u4e0d\u662finnerHTML<\/p>\n\n\n\n
\u5982\u679c\u60f3\u8981\u67d0\u4e2a\u8868\u5355\u88ab\u7981\u7528\uff0c\u90a3\u5c31\u8ba9\u6309\u94ae\u4e0d\u80fd\u70b9\u51fb\uff0c\u5c31\u8981\u8ba9\u8fd9\u4e2a\u6309\u94ae\u88ab\u7981\u7528<\/p>\n\n\n\n
btn.disabled = true;\uff08button\u7684disable\u5c5e\u6027\uff09\u7b49\u4e8ethis.disable = true;\u8fd9\u4e2athis\u6307\u5411\u4e8b\u4ef6\u51fd\u6570\u7684\u8c03\u7528\u8005\u3002<\/p>\n\n\n\n
\u6848\u4f8b \u6a21\u4eff\u4eac\u4e1c\u663e\u793a\u5bc6\u7801\u7684\u6848\u4f8b<\/p>\n\n\n\n
dom\u64cd\u4f5c\u6837\u5f0f\u5c5e\u6027<\/h3>\n\n\n\n
element.style \u884c\u6837\u5f0f\u64cd\u4f5c<\/p>\n\n\n\n
element.className\u7c7b\u540d\u6837\u5f0f\u64cd\u4f5c<\/p>\n\n\n\n
js\u91cc\u9762\u7684\u6837\u5f0f\u91c7\u53d6\u9a7c\u5cf0\u547d\u540d\u6cd5\uff0c\u6bd4\u5982fontSize,backgroundColor<\/p>\n\n\n\n
js\u91cc\u9762\u4fee\u6539style\u6837\u5f0f\u64cd\u4f5c\uff0c\u4ea7\u751f\u7684\u662f\u884c\u5185\u6837\u5f0f\uff0ccss\u6743\u91cd\u6bd4\u8f83\u9ad8<\/p>\n\n\n\n
\u6848\u4f8b\u64cd\u4f5c<\/p>\n\n\n\n
\u663e\u793a\u548c\u9690\u85cf\u6837\u5f0f<\/p>\n\n\n\n
<div id=\"div\">\n    <button id=\"btn\">\u70b9\u51fb<\/button>\n    <img src=\"images\/1.jpg\" style=\"width: 60px; height: 60px; display: block;\" alt=\"\" id=\"img\">\n<\/div>\n<script>\n    document.getElementById('btn').onclick = function () {\n        if (document.getElementById('img').style.display == 'none') {\n            document.getElementById('img').style.display = 'block';\n        } else {\n            document.getElementById('img').style.display = 'none';\n        }\n    }\n<\/script>\n<\/code><\/pre>\n\n\n\n
\u4eac\u4e1c\u641c\u7d22\u6846\u7684\u805a\u7126\u548c\u975e\u805a\u7126\u8f93\u5165\u6846<\/h4>\n\n\n\n
\u4e24\u4e2a\u4e8b\u4ef6\u4e00\u4e2a\u83b7\u5f97\u7126\u70b9onfocus\uff0c\u4e00\u4e2a\u662f\u5931\u53bb\u7126\u70b9\uff0conblur<\/p>\n\n\n\n
<input type=\"text\" value=\"\u8bf7\u8f93\u5165\">\n<script>\nvar input = document.querySelector('input');\ninput.onfocus = function() {\n    if (input.value == '\u8bf7\u8f93\u5165') {\n        input.value = '';\n        this.style.color = 'black';\n    }\n}\ninput.onblur = function() {\n    if (input.value == '') {\n        input.value = '\u8bf7\u8f93\u5165';\n    }\n}\n<\/script>\n<\/code><\/pre>\n\n\n\n
className\u7684\u5c5e\u6027<\/h3>\n\n\n\n
element.style\u5728\u8be5\u6837\u5f0f\u7684\u65f6\u5019\u8fc7\u591a\u5c31\u5f88\u590d\u6742\uff0c\u5982\u679c\u5f88\u591a\u7684\u65f6\u5019\u8fd9\u91cc\u53ef\u4ee5\u6539\u5143\u7d20\u7684\u7c7b\u66f4\u65b9\u4fbf\uff0celement.className<\/p>\n\n\n\n
<style>\n.class{\n    color: red;\n    width: 100px;\n    height: 100px;\n    background-color: yellow;\n}\n\n<\/style>\n    <title>Document<\/title>\n<\/head>\n<body>\n<div>\u70b9\u6211<\/div>\n<script>\n    var test = document.querySelector('div');\n    test.onclick = function(){\n        test.className = 'class';\n    }\n<\/script>\n<\/code><\/pre>\n\n\n\n
\u4f46\u662f\u8fd9\u79cd\u65b9\u5f0f\u4f1a\u76f4\u63a5\u6539\u7c7b\u540d\uff0c\u5c31\u4f1a\u76f4\u63a5\u8986\u76d6\u539f\u6765\u7684\u7c7b<\/p>\n\n\n\n
\u5982\u679c\u60f3\u4fdd\u7559\u539f\u6765\u7684\u7c7b\u540d<\/p>\n\n\n\n
\u5c31\u5728\u524d\u9762\u52a0\u4e2a\u539f\u6765\u7684\u7c7b<\/p>\n\n\n\n
    var test = document.querySelector('div');\n    test.onclick = function(){\n        test.className = 'first class';\n    }\/\/first\u662f\u539f\u6765\u7684\u7c7b\n<\/code><\/pre>\n\n\n\n
\u6392\u4ed6\u601d\u60f3<\/h2>\n\n\n\n
1.\u6240\u6709\u5143\u7d20\u5168\u90e8\u6e05\u9664\u6837\u5f0f<\/p>\n\n\n\n
2.\u7559\u4e0b\u81ea\u5df1\u7684\u6837\u5f0f<\/p>\n\n\n\n
3.\u987a\u5e8f\u4e0d\u80fd\u98a0\u5012<\/p>\n\n\n\n
\u4f46\u662f\u6211\u611f\u89c9\u8fd9\u79cd\u7684\u7a7a\u95f4\u590d\u6742\u5ea6\u8f83\u5927\uff0c\u6211\u89c9\u5f97\u6709\u5176\u4ed6\u65b9\u6cd5\uff0c\u8fd9\u91cc\u5c31\u4e0d\u591a\u5199\u3002<\/p>\n\n\n\n
\u767e\u5ea6\u6362\u80a4\u6848\u4f8b<\/h3>\n\n\n\n
<style>\n.baidu img {\nwidth: 100px;\n}\n<\/style>\n    <title>Document<\/title>\n<\/head>\n<body class=\"baidu\" >\n<li><img src=\"images\/1.jpg\" alt=\"\" style=\"width:100px height=100px\"><\/li>\n<li><img src=\"images\/2.jpg\" alt=\"\" style=\"width:100px height=100px\"><\/li>\n<script>\n    var imgs = document.querySelectorAll('img');\n    for(var i =0;i<imgs.length;i++){\n        imgs[i].onclick = function(){\n            document.body.style.backgroundImage = 'url(' +this.src+ ')';\n        }\n    }\n<\/script>\n<\/code><\/pre>\n\n\n\n
\u9f20\u6807\u6ed1\u8fc7\u8868\u683c\u884c\u53d8\u8272\u6848\u4f8b<\/h3>\n\n\n\n
<style>\n    .tb {\n        border: solid 1px;\n    }\n    .bg {\n        background-color: blue;\n    }\n<\/style>\n<\/head>\n<body>\n<table class=\"tb\">\n    <thead><td>1<\/td><td>1<\/td><td>1<\/td><td>1<\/td><\/thead>\n    <tbody>\n        <tr><td>1<\/td><td>1<\/td><td>1<\/td><td>1<\/td><\/tr>\n        <tr><td>1<\/td><td>1<\/td><td>1<\/td><td>1<\/td><\/tr>\n    <\/tbody>\n<\/table>\n<script>\n    var trs = document.querySelectorAll('tr');\n\n    for(var i =0;i<trs.length;i++){\n        trs[i].onmouseover=function(){\n            this.className = 'bg';\n            \n        }\n        trs[i].onmouseout=function(){\n            this.className = '';\n            \n        }\n    }\n<\/script>\n<\/body>\n<\/code><\/pre>\n\n\n\n
\u83b7\u53d6\u81ea\u5b9a\u4e49\u5c5e\u6027<\/h3>\n\n\n\n
<input type=\"checkbox\" checked=\"\">\n<script>\n    var int1 = document.querySelector('input');\nconsole.log(int1.getAttribute('type'));\n<\/code><\/pre>\n\n\n\n
element.getAttribute\u80fd\u591f\u83b7\u53d6\u81ea\u5b9a\u4e49\u5c5e\u6027<\/p>\n\n\n\n
element.\u5c5e\u6027 \u53ea\u80fd\u83b7\u53d6\u5185\u7f6e\u5c5e\u6027\u3002<\/p>\n\n\n\n
\u8bbe\u7f6e\u79fb\u9664\u81ea\u5b9a\u4e49\u5c5e\u6027\u503c<\/h3>\n\n\n\n
div.setAttribute(‘index’,2);\u8bbe\u7f6e<\/p>\n\n\n\n
div.removeAttribute(‘index’,2);\u79fb\u9664<\/p>\n\n\n\n
tab\u680f\u5207\u6362(\u91cd\u70b9\u6848\u4f8b\uff0c\u524d\u7aef\u5fc5\u987b\u5b66\u4f1a\u7684)<\/h3>\n\n\n\n
<!DOCTYPE html>\n<html lang=\"en\">\n\n<head>\n    <meta charset=\"UTF-8\">\n    <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n    <meta http-equiv=\"X-UA-Compatible\" content=\"ie=edge\">\n    <title>Document<\/title>\n    <style>\n        * {\n            margin: 0;\n            padding: 0;\n        }\n        \n        li {\n            list-style-type: none;\n        }\n        \n        .tab {\n            width: 978px;\n            margin: 100px auto;\n        }\n        \n        .tab_list {\n            height: 39px;\n            border: 1px solid #ccc;\n            background-color: #f1f1f1;\n        }\n        \n        .tab_list li {\n            float: left;\n            height: 39px;\n            line-height: 39px;\n            padding: 0 20px;\n            text-align: center;\n            cursor: pointer;\n        }\n        \n        .tab_list .current {\n            background-color: #c81623;\n            color: #fff;\n        }\n        \n        .item_info {\n            padding: 20px 0 0 20px;\n        }\n        \n        .item {\n            display: none;\n        }\n    <\/style>\n<\/head>\n\n<body>\n    <div class=\"tab\">\n        <div class=\"tab_list\">\n            <ul>\n                <li class=\"current\">\u5546\u54c1\u4ecb\u7ecd<\/li>\n                <li>\u89c4\u683c\u4e0e\u5305\u88c5<\/li>\n                <li>\u552e\u540e\u4fdd\u969c<\/li>\n                <li>\u5546\u54c1\u8bc4\u4ef7\uff0850000\uff09<\/li>\n                <li>\u624b\u673a\u793e\u533a<\/li>\n            <\/ul>\n        <\/div>\n        <div class=\"tab_con\">\n            <div class=\"item\" style=\"display: block;\">\n                \u5546\u54c1\u4ecb\u7ecd\u6a21\u5757\u5185\u5bb9\n            <\/div>\n            <div class=\"item\">\n                \u89c4\u683c\u4e0e\u5305\u88c5\u6a21\u5757\u5185\u5bb9\n            <\/div>\n            <div class=\"item\">\n                \u552e\u540e\u4fdd\u969c\u6a21\u5757\u5185\u5bb9\n            <\/div>\n            <div class=\"item\">\n                \u5546\u54c1\u8bc4\u4ef7\uff0850000\uff09\u6a21\u5757\u5185\u5bb9\n            <\/div>\n            <div class=\"item\">\n                \u624b\u673a\u793e\u533a\u6a21\u5757\u5185\u5bb9\n            <\/div>\n\n        <\/div>\n    <\/div>\n    <script>\n        \/\/ \u83b7\u53d6\u5143\u7d20\n        var tab_list = document.querySelector('.tab_list');\n        var lis = tab_list.querySelectorAll('li');\n        var items = document.querySelectorAll('.item');\n        \/\/ for\u5faa\u73af\u7ed1\u5b9a\u70b9\u51fb\u4e8b\u4ef6\n        for (var i = 0; i < lis.length; i++) {\n            \/\/ \u5f00\u59cb\u7ed95\u4e2a\u5c0fli \u8bbe\u7f6e\u7d22\u5f15\u53f7 \n            lis[i].setAttribute('index', i);\n            lis[i].onclick = function() {\n                \/\/ 1. \u4e0a\u7684\u6a21\u5757\u9009\u9879\u5361\uff0c\u70b9\u51fb\u67d0\u4e00\u4e2a\uff0c\u5f53\u524d\u8fd9\u4e00\u4e2a\u5e95\u8272\u4f1a\u662f\u7ea2\u8272\uff0c\u5176\u4f59\u4e0d\u53d8\uff08\u6392\u4ed6\u601d\u60f3\uff09 \u4fee\u6539\u7c7b\u540d\u7684\u65b9\u5f0f\n\n                \/\/ \u5e72\u6389\u6240\u6709\u4eba \u5176\u4f59\u7684li\u6e05\u9664 class \u8fd9\u4e2a\u7c7b\n                for (var i = 0; i < lis.length; i++) {\n                    lis[i].className = '';\n                }\n                \/\/ \u7559\u4e0b\u6211\u81ea\u5df1 \n                this.className = 'current';\n                \/\/ 2. \u4e0b\u9762\u7684\u663e\u793a\u5185\u5bb9\u6a21\u5757\n                var index = this.getAttribute('index');\n                console.log(index);\n                \/\/ \u5e72\u6389\u6240\u6709\u4eba \u8ba9\u5176\u4f59\u7684item \u8fd9\u4e9bdiv \u9690\u85cf\n                for (var i = 0; i < items.length; i++) {\n                    items[i].style.display = 'none';\n                }\n                \/\/ \u7559\u4e0b\u6211\u81ea\u5df1 \u8ba9\u5bf9\u5e94\u7684item \u663e\u793a\u51fa\u6765\n                items[index].style.display = 'block';\n            }\n        }\n    <\/script>\n<\/body>\n<\/html>\n<\/code><\/pre>\n\n\n\n
\u5224\u65ad\u662f\u5426\u662f\u81ea\u5b9a\u4e49\u5c5e\u6027<\/h2>\n\n\n\n
\u8bbe\u7f6eh5\u81ea\u5b9a\u4e49\u5c5e\u6027\uff0c\u4e00\u5b9a\u8981\u5728\u53d8\u91cf\u524d\u9762\u52a0data<\/p>\n\n\n\n
\u6bd4\u5982data-index<\/p>\n\n\n\n
div.setAttribute(‘data-time’,23);<\/p>\n\n\n\n
\u62ff\u5230\u5c5e\u6027\u7684\u503c\uff0c\u5c31\u7528getAttribute\u83b7\u53d6<\/p>\n\n\n\n
H5\u65b0\u589e\uff0c<\/p>\n\n\n\n
div(div.dataset.index)\uff1b(\u5fc5\u987b\u4ee5data\u5f00\u5934)<\/p>\n\n\n\n
\u8282\u70b9\u64cd\u4f5c<\/h2>\n\n\n\n
\u7236\u4eb2\u8282\u70b9<\/h3>\n\n\n\n
\u5728\u4e4b\u524d\u7684\u64cd\u4f5c\u83b7\u53d6\u4e00\u4e2a\u5143\u7d20\uff0c\u6bd4\u8f83\u9ebb\u70e6\uff0c\u83b7\u53d6\u4e24\u4e2a\u5143\u7d20\uff0c\u5c31\u5fc5\u987b\u58f0\u660e\u4e24\u4e2a\u53d8\u91cf\uff0c\u5982\u679c\u7528\u8282\u70b9\u64cd\u4f5c\uff0c\u5c31\u6bd4\u8f83\u7b80\u5355<\/p>\n\n\n\n
    <div class=\"box\">\n        <span class=\"test\">1<\/span>\n    <\/div>\n    <script>\n        var box = document.querySelector('.box');\n        var test = document.querySelector('.test');\n        \/\/\u8fd9\u662f\u4e4b\u524d\u7684\u65b9\u6cd5\n        \/\/\u56e0\u4e3a\u5728\u8fd9\u4e2ahtml\u4e2d\uff0cdiv\u662fspan\u7684\u7236\u4eb2\u8282\u70b9\uff0c\u53ef\u4ee5\u4f7f\u7528\u4e0b\u9762\u65b9\u6cd5\n        var parent = document.querySelector('.test').parentNode\/\/\u5f97\u5230\u79bb\u5143\u7d20\u6700\u65b0\u7684\u7236\u4eb2\u8282\u70b9\uff0c\u5982\u679c\u627e\u4e0d\u5230\u7236\u8282\u70b9\uff0c\u5c31\u8fd4\u56de\u4e3a\u7a7a\n        console.log(parent);\/\/\u9a8c\u8bc1\uff0c\u53d1\u73b0\u786e\u5b9e\u53ef\u4ee5\n<\/code><\/pre>\n\n\n\n
\u513f\u5b50\u8282\u70b9<\/h3>\n\n\n\n
\u4f7f\u7528\u65b9\u6cd5\uff0celement.childNodes\uff08\u8fd4\u56de\u7684\u4e00\u4e2a\u6570\u7ec4\uff09\u8fd4\u56de\u6240\u6709\u7684\u8282\u70b9\uff0c\u5305\u62ec\u6587\u5b57\u8282\u70b9\uff0c\u5143\u7d20\u8282\u70b9<\/p>\n\n\n\n
\u8fd9\u4e2a\u65f6\u5019\u4e3a\u4e86\u533a\u5206\uff0c\u5c31\u5f97\u6ce8\u610f\u8282\u70b9\u7684type<\/p>\n\n\n\n
\u6587\u5b57\u8282\u70b9\u7684nodeType\u662f3<\/p>\n\n\n\n
\u5143\u7d20\u8282\u70b9\u7684nodeType\u662f1\uff1b<\/p>\n\n\n\n
\u53ef\u4ee5\u901a\u8fc7\u5224\u65ad\uff0c\u4f46\u662f\u8fd9\u79cd\u9ebb\u70e6<\/p>\n\n\n\n
\u7528\u7b80\u5355\u7684\u65b9\u6cd5<\/p>\n\n\n\n
chidren\u83b7\u53d6\u6240\u6709\u7684\u5b50\u5143\u7d20\u8282\u70b9<\/p>\n\n\n\n
        var box = document.querySelector('.box');\n        var test = document.querySelector('.test');\n\n        var chird = document.querySelector('.box').children;\n        console.log(chird);\/\/\u9a8c\u8bc1\uff0c\u53d1\u73b0\u786e\u5b9e\u53ef\u4ee5     \n<\/code><\/pre>\n\n\n\n
    <div class=\"box\">\n       <ul class=\"test\">\n        <li>1<\/li>\n        <li>2<\/li>\n        <li>3<\/li>\n        <li>4<\/li>\n        <li>5<\/li>\n       <\/ul>\n    <\/div>\n    <script>\nvar list = document.querySelector('.test');\nconsole.log(list.children[1]);\n\n    <\/script>\n<\/body>\n<\/code><\/pre>\n\n\n\n
\u56e0\u4e3achidren\u662f\u4e2a\u4f2a\u6570\u7ec4\uff0c\u7528\u4e0a\u8bc9\u65b9\u6cd5\u6765\uff0c\u83b7\u53d6\u3002<\/p>\n\n\n\n
\u5144\u5f1f\u8282\u70b9<\/h3>\n\n\n\n
    <p>2<\/p>\n    <div>1<\/div>\n    <span>2<\/span>\n    <script>\n        var div = document.querySelector('div');\n        console.log(div.nextSibling);\n        console.log(div.previousSibling);\n        console.log(div.nextElementSibling);\/\/\u4e0b\u8282\u70b9\n        console.log(div.previousElementSibling);\/\/\u4e0a\u8282\u70b9\uff0c\u540e\u9762\u4e24\u4e2a\u90fd\u662fH5\u65b0\u589e\u7684\u6709\u517c\u5bb9\u6027\u95ee\u9898\n    <\/script>\n<\/code><\/pre>\n\n\n\n
\u521b\u5efa\u8282\u70b9<\/h3>\n\n\n\n
document.createElement('tagName')\n<\/code><\/pre>\n\n\n\n
\u6dfb\u52a0\u8282\u70b9<\/h3>\n\n\n\n
1.node.appendChild(child) \/\/node\u662f\u7236\u4eb2\uff0cchild\u662f\u5b69\u5b50<\/p>\n\n\n\n
2.node.insertBefore(child,\u6307\u5b9a\u5143\u7d20)\uff1b\/\/\u5728\u5143\u7d20\u4e4b\u524d\u63d2\u5165<\/p>\n\n\n\n
\u5148\u521b\u5efa\u5143\u7d20\uff0c\u518d\u6dfb\u52a0\u5143\u7d20<\/p>\n\n\n\n
\u6848\u4f8b\uff1a\u5b9e\u73b0\u7559\u8a00\u677f<\/h3>\n\n\n\n
<textarea name=\"\" id=\"\"><\/textarea>\n<button>\u8bc4\u8bba<\/button>\n<span>\u8bf7\u5728\u4e0b\u9762\u8bc4\u8bba<\/span>\n<ul>\n\n<\/ul>\n<script>\n   \n    var ul = document.querySelector('ul')\n    var textarea = document.querySelector('textarea');\n    var button = document.querySelector('button');\n    button.onclick=function(){\n        if(textarea.value==''){\n            alert('\u8bf7\u8f93\u5165\u5185\u5bb9');\n        }else{\n        var li = document.createElement('li');\n        ul.insertBefore(li,ul.children[0]);\n        li.innerHTML = textarea.value;\n        }\n    }\n\n<\/code><\/pre>\n\n\n\n
\u4e3b\u8981\u662f\u5f53\u70b9\u51fb\u6309\u94ae\u540e\uff0c\u5c31\u4f1a\u521b\u5efa\u65b0\u7684li\uff0c\u7136\u540e\u4ece\u524d\u9762\u63d2\u5165\u4f7f\u7528Inserbefore\uff0c\u7b26\u5408\u7559\u8a00\u677f\u7684\u903b\u8f91\u3002<\/p>\n\n\n\n
\u5220\u9664\u8282\u70b9<\/h3>\n\n\n\n
node.removeChild(child)<\/p>\n\n\n\n
<ul>\n    <li>hello<\/li>\n    <li>hello1<\/li>\n<\/ul>\n<button>\u70b9\u51fb\u5220\u9664hello<\/button>\n<script>\n    var ul=document.querySelector('ul');\n    var button =document.querySelector('button');\n    button.onclick=function(){\n        \n        if(ul.children.length==0){\n            alert('\u6ca1\u6709\u5185\u5bb9');\n        }else{\n            ul.removeChild(ul.children[0]); \n        }\n        \n    }\n<\/script>\n<\/code><\/pre>\n\n\n\n
ul.removeChild(ul.children[0]);<\/strong><\/p>\n\n\n\n
\u4e00\u5b9a\u8981\u5728ul.children\u8fd9\u91cc\u6307\u660e\u7236\u4eb2\u4e3aul\u3002<\/p>\n\n\n\n
\u7559\u8a00\u677f\u5185\u5bb9\u5220\u9664<\/h3>\n\n\n\n
\u6709\u4e2a\u5c0f\u6280\u5de7\u963b\u6b62\u94fe\u63a5\u8df3\u8f6c\u5728href\u6dfb\u52a0’javascript:;’<\/p>\n\n\n\n
\"<a href='javascript:;'>\u5220\u9664<\/a>\"\n<\/code><\/pre>\n\n\n\n
<body>\n    <textarea name=\"\" id=\"\"><\/textarea>\n    <button>\u53d1\u5e03<\/button>\n    <ul>\n\n    <\/ul>\n    <script>\n        \/\/ 1. \u83b7\u53d6\u5143\u7d20\n        var btn = document.querySelector('button');\n        var text = document.querySelector('textarea');\n        var ul = document.querySelector('ul');\n        \/\/ 2. \u6ce8\u518c\u4e8b\u4ef6\n        btn.onclick = function() {\n            if (text.value == '') {\n                alert('\u60a8\u6ca1\u6709\u8f93\u5165\u5185\u5bb9');\n                return false;\n            } else {\n                \/\/ console.log(text.value);\n                \/\/ (1) \u521b\u5efa\u5143\u7d20\n                var li = document.createElement('li');\n                \/\/ \u5148\u6709li \u624d\u80fd\u8d4b\u503c\n                li.innerHTML = text.value + \"<a href='javascript:;'>\u5220\u9664<\/a>\";\n                \/\/ (2) \u6dfb\u52a0\u5143\u7d20\n                \/\/ ul.appendChild(li);\n                ul.insertBefore(li, ul.children[0]);\n                \/\/ (3) \u5220\u9664\u5143\u7d20 \u5220\u9664\u7684\u662f\u5f53\u524d\u94fe\u63a5\u7684li  \u5b83\u7684\u7236\u4eb2\n                var as = document.querySelectorAll('a');\n                for (var i = 0; i < as.length; i++) {\n                    as[i].onclick = function() {\n                        \/\/ node.removeChild(child); \u5220\u9664\u7684\u662f li \u5f53\u524da\u6240\u5728\u7684li  this.parentNode;\n                        ul.removeChild(this.parentNode);\n                    }\n                }\n            }\n        }\n    <\/script>\n<\/code><\/pre>\n\n\n\n
\u514b\u9686\u8282\u70b9(\u590d\u5236\u8282\u70b9)<\/h3>\n\n\n\n
node.cloneNode(),\u62ec\u53f7\u91cc\u9762\u4e3a\u7a7a\u6216\u8005\u91cc\u9762\u662ffalse\u6d45\u62f7\u8d1d \u53ea\u590d\u5236\u6807\u7b7e\u4e0d\u590d\u5236\u91cc\u9762\u7684\u5185\u5bb9<\/p>\n\n\n\n
node.cloneNode(true)\uff0c\u4e3atrue\u4e3a\u6df1\u62f7\u8d1d\u3002<\/p>\n\n\n\n
\u6848\u4f8b\u52a8\u6001\u751f\u6210\u8868\u683c<\/h3>\n\n\n\n
<!DOCTYPE html>\n<html lang=\"en\">\n\n<head>\n    <meta charset=\"UTF-8\">\n    <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n    <meta http-equiv=\"X-UA-Compatible\" content=\"ie=edge\">\n    <title>Document<\/title>\n    <style>\n        table {\n            width: 500px;\n            margin: 100px auto;\n            border-collapse: collapse;\n            text-align: center;\n        }\n        \n        td,\n        th {\n            border: 1px solid #333;\n        }\n        \n        thead tr {\n            height: 40px;\n            background-color: #ccc;\n        }\n    <\/style>\n<\/head>\n\n<body>\n    <table cellspacing=\"0\">\n        <thead>\n            <tr>\n                <th>\u59d3\u540d<\/th>\n                <th>\u79d1\u76ee<\/th>\n                <th>\u6210\u7ee9<\/th>\n                <th>\u64cd\u4f5c<\/th>\n            <\/tr>\n        <\/thead>\n        <tbody>\n\n        <\/tbody>\n    <\/table>\n    <script>\n        \/\/ 1.\u5148\u53bb\u51c6\u5907\u597d\u5b66\u751f\u7684\u6570\u636e\n        var datas = [{\n            name: '\u9b4f\u748e\u73de',\n            subject: 'JavaScript',\n            score: 100\n        }, {\n            name: '\u5f18\u5386',\n            subject: 'JavaScript',\n            score: 98\n        }, {\n            name: '\u5085\u6052',\n            subject: 'JavaScript',\n            score: 99\n        }, {\n            name: '\u660e\u7389',\n            subject: 'JavaScript',\n            score: 88\n        }, {\n            name: '\u5927\u732a\u8e44\u5b50',\n            subject: 'JavaScript',\n            score: 0\n        }];\n        \/\/ 2. \u5f80tbody \u91cc\u9762\u521b\u5efa\u884c\uff1a \u6709\u51e0\u4e2a\u4eba\uff08\u901a\u8fc7\u6570\u7ec4\u7684\u957f\u5ea6\uff09\u6211\u4eec\u5c31\u521b\u5efa\u51e0\u884c\n        var tbody = document.querySelector('tbody');\n        for(var i=0;i<datas.length;i++){\n            var tr=document.createElement('tr');\n            tbody.appendChild(tr);\n            for(var k in datas[i] ){\n                var td = document.createElement('td');\n                tr.appendChild(td);\n                td.innerHTML = datas[i][k];\n            }\n            var td = document.createElement('td');\n            td.innerHTML = '<a href=\"javascript:;\">\u5220\u9664 <\/a>';\n            tr.appendChild(td);\n        \n        }\n        var as = document.querySelectorAll('a');\n        for (var i=0;i<as.length;i++){\n            as[i].onclick = function(){\n                tbody.removeChild(this.parentNode.parentNode); \n        }\n    }\n    <\/script>\n<\/body>\n<\/html>\n<\/code><\/pre>\n\n\n\n
\u4e09\u79cd\u52a8\u6001\u521b\u5efa\u5143\u7d20\u7684\u533a\u522b\uff08\u9762\u8bd5\u91cd\u70b9\uff09<\/h3>\n\n\n\n
document.write()<\/p>\n\n\n\n
\u76f4\u63a5\u5c06\u5185\u5bb9\u5199\u8fdb\u9875\u9762\u7684\u5185\u5bb9\u6d41\uff0c\u4f46\u662f\u6587\u6863\u6267\u884c\u5b8c\u6bd5\uff0c\u5c06\u4f1a\u5bfc\u81f4\u9875\u9762\u5168\u90e8\u91cd\u7ed8\u3002<\/p>\n\n\n\n
element.innerHTML<\/p>\n\n\n\n
\u5c06\u5185\u5bb9\u76f4\u63a5\u5199\u5165\u67d0\u4e2adom\u8282\u70b9\uff0c\u4e0d\u4f1a\u5bfc\u81f4\u9875\u9762\u5168\u90e8\u91cd\u7ed8<\/p>\n\n\n\n
\u521b\u5efa\u591a\u4e2a\u5143\u7d20\u6548\u7387\u66f4\u9ad8\uff08\u4e0d\u8981\u62fc\u63a5\u5b57\u7b26\u4e32\uff0c\u91c7\u53d6\u6570\u7ec4\u5f62\u5f0f\u62fc\u63a5\uff09\uff0c\u7ed3\u6784\u7a0d\u5fae\u590d\u6742\u3002<\/p>\n\n\n\n
document.createElement()<\/p>\n\n\n\n
\u521b\u5efa\u591a\u4e2a\u5143\u7d20\u6548\u7387\u7a0d\u4f4e\u4e00\u70b9\uff0c\u4f46\u662f\u7ed3\u6784\u66f4\u52a0\u6e05\u6670<\/p>\n\n\n\n
\u6ce8\u518c\u4e8b\u4ef6<\/h2>\n\n\n\n
\u4f20\u7edf\u7684\u6ce8\u518c\u65b9\u5f0f<\/h3>\n\n\n\n
\u6ce8\u518c\u4e8b\u4ef6\u7684\u552f\u4e00\u6027<\/p>\n\n\n\n
\u4f20\u7edf\u7684\u4e8b\u4ef6\u53ea\u80fd\u8bbe\u7f6e\u4e00\u4e2a\u5904\u7406\u51fd\u6570\uff0c\u6700\u540e\u6ce8\u518c\u7684\u5904\u7406\u51fd\u6570\u5c06\u4f1a\u8986\u76d6\u524d\u9762\u6ce8\u518c\u7684\u5904\u7406\u51fd\u6570<\/p>\n\n\n\n
\u65b9\u6cd5\u76d1\u542c\u6ce8\u518c\u65b9\u5f0f<\/h3>\n\n\n\n
w3c\u6807\u51c6\u63a8\u8350<\/p>\n\n\n\n
addEventListener()\u4ed6\u662f\u4e00\u4e2a\u65b9\u6cd5<\/p>\n\n\n\n
IE9\u4ee5\u524d\u4e0d\u652f\u6301\u8fd9\u4e2a\u65b9\u6cd5\uff0c\u53ef\u4ee5\u7528attatchEvent()\u4ee3\u66ff<\/p>\n\n\n\n
\u65b9\u5f0f<\/p>\n\n\n\n
evenTarget.addEventLisentener(type,listenr[, useCapture])\n<\/code><\/pre>\n\n\n\n
type:\u4e8b\u4ef6\u5b57\u7b26\u4e32\u7c7b\u578b\uff0c\u6bd4\u5982click,mouseover\u8fd9\u91cc\u4e0d\u5e26on lisener:\u4e8b\u4ef6\u5904\u7406\u51fd\u6570\uff0c\u4e8b\u4ef6\u53d1\u751f\u65f6\uff0c\u4f1a\u8c03\u7528\u76d1\u542c\u51fd\u6570<\/p>\n\n\n\n
useCapture\uff1a\u53ef\u9009\u53c2\u6570\uff0c\u662f\u4e00\u4e2a\u5e03\u5c14\u503c\uff0c\u9ed8\u8ba4\u4e3afalse\u3002\u5b66\u5b8cDOM\u4e8b\u4ef6\u6d41\u540e\uff0c\u8fdb\u4e00\u6b65\u5b66\u4e60<\/p>\n\n\n\n
    <button>\u76d1\u542c\u4e8b\u4ef6\u6d4b\u8bd5<\/button>\n    <script>\n        var btn = document.querySelector('button');\n        btn.addEventListener('click',function(){\n            alert('11');\n        })\n    <\/script>\n<\/code><\/pre>\n\n\n\n
\u53ef\u4ee5\u7ed1\u5b9a\u591a\u4e2a\u4e8b\u4ef6<\/p>\n\n\n\n
    <button>\u76d1\u542c\u4e8b\u4ef6\u6d4b\u8bd5<\/button>\n    <script>\n        var btn = document.querySelector('button');\n        btn.addEventListener('click',function(){\n            alert('11');\n        })\n        btn.addEventListener('click',function(){\n            alert('22');\n        })\n<\/code><\/pre>\n\n\n\n
addEventLisentener\u662fi9\u4ee5\u4e0a\u624d\u652f\u6301\u7684\uff0c\u4f4e\u7248\u672c\u7684\u5316\u3002\u7528attachEvent\u4e8b\u4ef6\u76d1\u542c\u65b9\u5f0f\uff0c\u4e86\u89e3\u5c31\u597d<\/p>\n\n\n\n
\u5220\u9664\u4e8b\u4ef6\uff08\u89e3\u7ed1\u4e8b\u4ef6\uff09<\/h2>\n\n\n\n
\u5220\u9664\u4e8b\u4ef6\u7684\u65b9\u6cd5<\/p>\n\n\n\n
1.\u4f20\u7edf\u6ce8\u518c\u65b9\u6cd5<\/h3>\n\n\n\n
eventTarget.onclick = null;<\/p>\n\n\n\n
2.\u76d1\u542c\u6ce8\u518c\u65b9\u6cd5<\/h3>\n\n\n\n
eventTarget.addEventListener('click',fn);\n\/\/\u5728\u6dfb\u52a0\u7ed1\u5b9a\u7684\u65f6\u5019\u5c31\u4e0d\u80fd\u7528\u533f\u540d\u51fd\u6570\u7684\u65b9\u5f0f\u4e86\uff0c\u5f97\u5199\u51fa\u6765\u518d\u8c03\u7528\u624d\u884c\uff0c\u5e76\u4e14fn\u4e0d\u52a0\u62ec\u53f7\uff0c\u6bd4\u8f83\u7279\u6b8a\neventTarget.removeEventListener('click',fn);\nfunction fn(){\n\nalert(22);\n\n}\n<\/code><\/pre>\n\n\n\n
dom\u4e8b\u4ef6\u6d41<\/h2>\n\n\n\n
\u4e8b\u4ef6\u6d41\u63cf\u8ff0\u5f97\u662f\u9875\u9762\u4e2d\u63a5\u6536\u4e8b\u4ef6\u5f97\u987a\u5e8f<\/p>\n\n\n\n
\u5206\u4e3a\u4e09\u4e2a\u9636\u6bb5\u3002<\/p>\n\n\n\n
1.\u6355\u83b7\u9636\u6bb5<\/p>\n\n\n\n
2.\u5f53\u524d\u76ee\u6807\u9636\u6bb5<\/p>\n\n\n\n
3.\u5192\u6ce1\u9636\u6bb5<\/p>\n\n\n\n
\u610f\u601d\u5c31\u662f\u5047\u5982\u4e00\u4e2adiv\u91cc\u9762\u5d4c\u5957\u4e86\u4e00\u4e2adiv\uff0c\u5982\u679c\u4e24\u4e2a\u90fd\u7ed1\u5b9a\u4e86\u4e8b\u4ef6\uff0c\u90a3\u5982\u679c\u4e8b\u4ef6\u76d1\u542c\u5f97\u7684\u7b2c\u4e09\u4e2a\u53c2\u6570\u51b3\u5b9a\u662f\u5192\u6ce1\u9636\u6bb5\u8fd8\u662f\u6355\u83b7\u9636\u6bb5\uff0c\u5982\u679c\u662ftrue\u662f\u4e8b\u4ef6\u6355\u83b7\uff0c\u5982\u679c\u4e0d\u5199\u548cfalse\u662f\u5192\u6ce1\u4e8b\u4ef6\uff0c\u6355\u83b7\u7684\u5316\u90a3\u5c31\u662f\u5148\u6267\u884c\u5916\u9762div\u7684\u4e8b\u4ef6\uff0c\u518d\u6267\u884c\u91cc\u9762\u7684div\u4e8b\u4ef6<\/p>\n\n\n\n
\u4e8b\u4ef6\u5bf9\u8c61<\/h2>\n\n\n\n
var div = document.queryselect('div');\ndiv.onclick = function(event){}\n\/\/\u5176\u4e2d\u7684event\u5c31\u662f\u4e8b\u4ef6\u5bf9\u8c61\uff0c\u5199\u5728\u4fa6\u542c\u51fd\u6570\u7684\u5c0f\u62ec\u53f7\u91cc\u9762\uff0c\u5f53\u4f5c\u5f62\u53c2\u6765\u770b\n\/\/\u4e8b\u4ef6\u5bf9\u8c61\u53ea\u6709\u6709\u4e86\u4e8b\u4ef6\u624d\u4f1a\u5b58\u5728\u3002\u4ed6\u662f\u7cfb\u7edf\u81ea\u52a8\u521b\u5efa\u7684\uff0c\u4e0d\u9700\u8981\u6211\u4eec\u4f20\u9012\u53c2\u6570\n\/\/\u4e8b\u4ef6\u5bf9\u8c61\u662f\u6211\u4eec\u4e8b\u4ef6\u7684\u4e00\u7cfb\u5217\u76f8\u5173\u5bf9\u8c61\u7684\u96c6\u5408\uff0c\u6bd4\u5982\u9f20\u6807\u70b9\u51fb\u5c31\u5305\u542b\u4e86\u9f20\u6807\u7684\u76f8\u5173\u4fe1\u606f\u3002\n\/\/\u4e8b\u4ef6\u5bf9\u8c61\u4e5f\u53ef\u4ee5\u81ea\u547d\u540devent\u5199\u6210\u4e5f\u8bb8\n\n<\/code><\/pre>\n\n\n\n
<div>1<\/div>\n<script>\n    var div = document.querySelector('div');\n    div.onclick = function(){\n        console.log(event);\n    }\n<\/script>\n<\/code><\/pre>\n\n\n\n
this\u548ce.target\u7684\u533a\u522b<\/h3>\n\n\n\n
this\u662f\u7ed1\u5b9a\u7684\u4e8b\u4ef6\u5bf9\u8c61\uff0ctarget\u662f\u89e6\u53d1\u4e8b\u4ef6\u7684\u5bf9\u8c61<\/p>\n\n\n\n
\u8fd8\u6709\u5176\u4ed6\u5f88\u591a\u7684\u4e8b\u4ef6\u5bf9\u8c61\uff0c\u8981\u770b\u67e5\u6587\u6863\u5427\u3002<\/p>\n\n\n\n
\u963b\u6b62\u5192\u6ce1\u4e8b\u4ef6<\/h3>\n\n\n\n
\u6807\u51c6\u5199\u6cd5\uff1a\u5229\u7528\u4e8b\u4ef6\u5bf9\u8c61\u91cc\u9762\u7684stopPropagation()\u65b9\u6cd5<\/p>\n\n\n\n
    <div class=\"father\">\n        <div class=\"son\">son\u513f\u5b50<\/div>\n    <\/div>\n    <script>\n        \/\/ \u5e38\u89c1\u4e8b\u4ef6\u5bf9\u8c61\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\n        \/\/ \u963b\u6b62\u5192\u6ce1  dom \u63a8\u8350\u7684\u6807\u51c6 stopPropagation() \n        var son = document.querySelector('.son');\n        son.addEventListener('click', function(e) {\n            alert('son');\n            e.stopPropagation(); \/\/ stop \u505c\u6b62  Propagation \u4f20\u64ad\n            e.cancelBubble = true; \/\/ \u975e\u6807\u51c6 cancel \u53d6\u6d88 bubble \u6ce1\u6ce1\n        }, false);\n\n        var father = document.querySelector('.father');\n        father.addEventListener('click', function() {\n            alert('father');\n        }, false);\n        document.addEventListener('click', function() {\n            alert('document');\n        })\n    <\/script>\n<\/code><\/pre>\n\n\n\n
\u4e8b\u4ef6\u59d4\u6258\uff0c\u4e8b\u4ef6\u4ee3\u7406<\/h3>\n\n\n\n
\u4e0d\u662f\u6bcf\u4e2a\u5b50\u8282\u70b9\u5355\u72ec\u8bbe\u7f6e\u4e8b\u4ef6\u76d1\u542c\u5668\uff0c\u800c\u662f\u4e8b\u4ef6\u76d1\u542c\u5668\u8bbe\u7f6e\u5728\u5176\u7236\u8282\u70b9\u4e0a\uff0c\u7136\u540e\u5229\u7528\u5192\u6ce1\u539f\u7406\u5f71\u54cd\u8bbe\u7f6e\u6bcf\u4e2a\u5b50\u8282\u70b9<\/p>\n\n\n\n
\u6848\u4f8b\uff1aul\u6ce8\u518c\u70b9\u51fb\u4e8b\u4ef6\uff0c\u7136\u540e\u5229\u7528\u4e8b\u4ef6\u5bf9\u8c61\u7684target\u6765\u627e\u5230\u5f53\u524d\u70b9\u51fb\u7684li\uff0c\u56e0\u4e3a\u70b9\u51fbli\uff0c\u4e8b\u4ef6\u4f1a\u5192\u6ce1\u5230ul\u3002<\/p>\n\n\n\n
\u63d0\u9ad8\u4e86DOM\u7684\u6027\u80fd\u3002<\/p>\n\n\n\n
    <ul>\n        <li>\u77e5\u5426\u77e5\u5426\uff0c\u70b9\u6211\u5e94\u6709\u5f39\u6846\u5728\u624b\uff01<\/li>\n        <li>\u77e5\u5426\u77e5\u5426\uff0c\u70b9\u6211\u5e94\u6709\u5f39\u6846\u5728\u624b\uff01<\/li>\n        <li>\u77e5\u5426\u77e5\u5426\uff0c\u70b9\u6211\u5e94\u6709\u5f39\u6846\u5728\u624b\uff01<\/li>\n        <li>\u77e5\u5426\u77e5\u5426\uff0c\u70b9\u6211\u5e94\u6709\u5f39\u6846\u5728\u624b\uff01<\/li>\n        <li>\u77e5\u5426\u77e5\u5426\uff0c\u70b9\u6211\u5e94\u6709\u5f39\u6846\u5728\u624b\uff01<\/li>\n    <\/ul>\n    <script>\n        \/\/ \u4e8b\u4ef6\u59d4\u6258\u7684\u6838\u5fc3\u539f\u7406\uff1a\u7ed9\u7236\u8282\u70b9\u6dfb\u52a0\u4fa6\u542c\u5668\uff0c \u5229\u7528\u4e8b\u4ef6\u5192\u6ce1\u5f71\u54cd\u6bcf\u4e00\u4e2a\u5b50\u8282\u70b9\n        var ul = document.querySelector('ul');\n        ul.addEventListener('click', function(e) {\n            \/\/ alert('\u77e5\u5426\u77e5\u5426\uff0c\u70b9\u6211\u5e94\u6709\u5f39\u6846\u5728\u624b\uff01');\n            \/\/ e.target \u8fd9\u4e2a\u53ef\u4ee5\u5f97\u5230\u6211\u4eec\u70b9\u51fb\u7684\u5bf9\u8c61\n            e.target.style.backgroundColor = 'pink';\n\n\n        })\n    <\/script>\n<\/code><\/pre>\n\n\n\n
\u5e38\u7528\u7684\u9f20\u6807\u4e8b\u4ef6<\/h2>\n\n\n\n
1.\u7981\u6b62\u9f20\u6807\u53f3\u952e<\/p>\n\n\n\n
contextmenu\u63a7\u5236\u4f55\u65f6\u663e\u793a\u4e0a\u4e0b\u6587<\/p>\n\n\n\n
    \u6211\u662f\u4e00\u6bb5\u4e0d\u613f\u610f\u5206\u4eab\u7684\u6587\u5b57\n    <script>\n        \/\/ 1. contextmenu \u6211\u4eec\u53ef\u4ee5\u7981\u7528\u53f3\u952e\u83dc\u5355\n        document.addEventListener('contextmenu', function(e) {\n                e.preventDefault();\n            })\n    <\/script>\n<\/code><\/pre>\n\n\n\n
2.\u7981\u6b62\u9f20\u6807\u9009\u4e2d<\/p>\n\n\n\n
selectstart \u5f00\u59cb\u9009\u4e2d<\/p>\n\n\n\n
        document.addEventListener('selectstart', function(e) {\n            e.preventDefault();\n        })\n<\/code><\/pre>\n\n\n\n
\u9f20\u6807\u4e8b\u4ef6\u5bf9\u8c61<\/h3>\n\n\n\n
e.clientX<\/p>\n\n\n\n
e.clientY<\/p>\n\n\n\n
\u8fd9\u4e24\u4e2a\u662f\u9f20\u6807\u5728\u6d4f\u89c8\u5668\u7a97\u53e3\u7684\u5750\u6807<\/p>\n\n\n\n
e.pageX<\/p>\n\n\n\n
e.pageY<\/p>\n\n\n\n
\u8fd9\u4e24\u4e2a\u662f\u9f20\u6807\u5728\u6587\u6863\u9875\u9762\u7684\u5750\u6807\u3002<\/p>\n\n\n\n
e.screenX<\/p>\n\n\n\n
e.screenY<\/p>\n\n\n\n
\u8ddd\u79bb\u7535\u8111\u5c4f\u5e55\u7684\u5750\u6807<\/p>\n\n\n\n
\u8ddf\u968f\u9f20\u6807\u7684\u5c0f\u5929\u4f7f\u6848\u4f8b\uff08\u8fd9\u4e2a\u8fd8\u4e0d\u9519\uff09<\/h3>\n\n\n\n
1.\u9f20\u6807\u4e0d\u65ad\u79fb\u52a8\uff0c\u6ce8\u518cmousemove<\/p>\n\n\n\n
2.\u7ed9document\u6ce8\u518c\u4e8b\u4ef6<\/p>\n\n\n\n
3.\u56fe\u7247\u79fb\u52a8\u8ddd\u79bb\uff0c\u4e0d\u5360\u7528\u4f4d\u7f6e\uff0c\u6211\u4eec\u4f7f\u7528\u7edd\u5bf9\u4f4d\u7f6e\u5373\u53ef<\/p>\n\n\n\n
4.\u6838\u5fc3\u539f\u7406\uff1a\u6bcf\u6b21\u79fb\u52a8\u9f20\u6807\uff0c\u5c31\u53ef\u4ee5\u83b7\u53d6\u6700\u65b0\u7684\u9f20\u6807\u5750\u6807\uff0c\u628a\u8fd9\u4e2axy\u7684\u5750\u6807\u4f5c\u4e3a\u56fe\u6807\u7684top\u548cleft\u503c\u5c31\u53ef\u4ee5\u79fb\u52a8\u56fe\u7247<\/p>\n\n\n\n
<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n    <meta charset=\"UTF-8\">\n    <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n    <title>Document<\/title>\n    <style>\n        img{\n            position: absolute;\n        }\n    <\/style>\n<\/head>\n<body>\n    <img src=\"\u7b2c\u4e09\u5929\/images\/angel.gif\" alt=\"\">\n    <script>\n        var document = document.querySelector('document');\n        document.addEventListener('mousemove',function(e){\n            var X= e.clientX;\n            var Y= e.clientY;\n            var angel = document.querySelector('img');\n            angel.style.left = X + 'px';\n            angel.style.top = Y + 'px';  \n\n        })\n    <\/script>\n<\/body>\n<\/html>\n<\/code><\/pre>\n\n\n\n
\u8fd9\u91cc\u7684img\u7684css\u7684postion\u8981\u6539\u4e3aabsolute\u624d\u884c\u3002<\/p>\n\n\n\n
        angel.style.left = X + 'px';\n        angel.style.top = Y + 'px';  \/\/\u5343\u4e07\u8981\u52a0\u4e0a\u4e00\u4e2apx\u5355\u4f4d\n<\/code><\/pre>\n\n\n\n
\u4f46\u662f\u8fd9\u6837\u7684\u5316\uff0c\u56fe\u7247\u5728\u9f20\u6807\u7684\u53f3\u4e0b\u89d2\uff0c\u53ef\u4ee5\u6539\u4e00\u4e0b<\/p>\n\n\n\n
angel.style.left = X-30 + ‘px’;<\/p>\n\n\n\n
angel.style.top = Y -30+ ‘px’;<\/p>\n\n\n\n
\u51cf\u4e00\u4e2a30\u5c31\u5dee\u4e0d\u591a\u4e86\u3002<\/p>\n\n\n\n
\u5e38\u89c1\u7684\u952e\u76d8\u4e8b\u4ef6<\/h2>\n\n\n\n
onkeyup<\/p>\n\n\n\n
\u6309\u952e\u5f39\u8d77\u7684\u65f6\u5019\u89e6\u53d1<\/p>\n\n\n\n
onkeydown<\/p>\n\n\n\n
\u6309\u952e\u6309\u4e0b\u7684\u65f6\u5019\u89e6\u53d1<\/p>\n\n\n\n
onkeypress<\/p>\n\n\n\n
\u6309\u952e\u6309\u4e0b\u65f6\u89e6\u53d1,\u4f46\u662f\u4e0d\u80fd\u8bc6\u522b\u529f\u80fd\u952e\uff0cshift,ctrl,\u7bad\u5934\u7b49\u90fd\u4e0d\u53ef\u4ee5<\/p>\n\n\n\n
\u8fd9\u4e09\u4e2a\u4e8b\u4ef6\u7684 \u6267\u884c\u987a\u5e8fkeydown>keypress>keyup<\/p>\n\n\n\n
keycode\u53ef\u4ee5\u83b7\u5f97\u952e\u76d8\u7684ascii\u7801<\/p>\n\n\n\n
BOM<\/h2>\n\n\n\n
BOM\u662f\u6d4f\u89c8\u5668\u5bf9\u8c61\u6a21\u578b\uff0c\u4ed6\u63d0\u4f9b\u4e86\u72ec\u7acb\u5185\u5bb9\u800c\u4e0e\u6d4f\u89c8\u5668\u7a97\u53e3\u8fdb\u884c\u4ea4\u4e92\u7684\u5bf9\u8c61\uff0c\u5176\u6838\u5fc3\u662fwindow\u3002<\/p>\n\n\n\n
\u4e3b\u8981\u5b66\u4e60BOM\u5bf9\u8c61\uff0c\u4f46\u662f\u4ed6\u7684\u517c\u5bb9\u6027\u6bd4\u8f83\u5dee\uff0c\u6ca1\u6709\u6807\u51c6\u3002<\/p>\n\n\n\n
BOM\u7684\u9876\u7ea7\u5bf9\u8c61\u662fwindow<\/p>\n\n\n\n
\u5728\u5168\u5c40\u4f5c\u7528\u4e0b\u7684\u53d8\u91cf\u548c\u51fd\u6570\u5176\u5b9e\u90fd\u662fwindow\u7684\u5c5e\u6027\u548c\u65b9\u6cd5<\/p>\n\n\n\n
    <script>\n        var num = 10;\n        console.log(num);\n        console.log(window.num);\n        function test(){\n            console.log(11);\n        }\n        test();\n        window.test();\n    <\/script>\n<\/code><\/pre>\n\n\n\n
\u5e38\u89c1\u7684window\u5bf9\u8c61<\/h3>\n\n\n\n
\u7a97\u53e3\u52a0\u8f7d\u4e8b\u4ef6<\/h4>\n\n\n\n
\u5728\u4e4b\u524d\u7684\u5b66\u4e60\u4e2d\uff0c\u6211\u4eec\u60f3\u8981\u8ba9\u6309\u94ae\u7ed1\u5b9a\u4e00\u4e2a\u4e8b\u4ef6\u5f39\u51fa\u5bf9\u8bdd\u6846\uff0c\u4f46\u662fscript\u4e00\u76f4\u53ea\u80fd\u653e\u5728\u6309\u94ae\u7684\u540e\u9762\uff0c\u6709\u6ca1\u6709\u4ec0\u4e48\u529e\u6cd5\u53ef\u4ee5\u653e\u5230\u524d\u9762\u5462\uff1f<\/p>\n\n\n\n
\u5728window.onload\u9875\u9762\u52a0\u8f7d\u5b8c\u6210\u540e\u624d\u4f1a\u89e6\u53d1\uff0c\u6211\u4eec\u628a\u8981\u6267\u884c\u7684\u6240\u6709\u7684\u5185\u5bb9\u90fd\u653e\u5230window.onload\u91cc\u9762\u5c31\u53ef\u4ee5\u4e86\u3002<\/p>\n\n\n\n
<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n    <script>\n        window.onaload = function(){\n            var bun = document.querySelector('button');\n            bun.addEventListener('click',function(){\n                alert('\u5f39\u6846');\n            })\n        }\n    <\/script>\n    <meta charset=\"UTF-8\">\n    <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n    <title>Document<\/title>\n<\/head>\n<body>\n<button>\u70b9\u6211\u5f39\u6846<\/button>\n<\/body>\n<\/html>\n<\/code><\/pre>\n\n\n\n
\u4f46\u662f\u8fd9\u91cc\u6700\u597d\u4e0d\u8981\u7528onload\u8fd9\u79cd\u662f\u4f20\u7edf\u5199\u6cd5\u4f1a\u6709\u9650\u5236\uff0c\u6700\u597d\u7528<\/p>\n\n\n\n
window.addEventListener('click',function(){\n    var bun = document.querySelector('button');\n            bun.addEventListener('click',function(){\n                alert('\u5f39\u6846');\n            })\n}\n<\/code><\/pre>\n\n\n\n
DomContentLoaded \u4ec5\u5f53dom\u5143\u7d20\u52a0\u8f7d\u5b8c\u6210\u5c31\u53ef\u4ee5\u4e86\uff0c\u4e0d\u9700\u8981\u6837\u5f0f\u8868\u548c\u56fe\u7247\u5b8c\u5168\u52a0\u8f7d\u5b8c\u540e\u624d\u5f39\u51fa\u6765\u3002\u8fd9\u4e2a\u6bd4\u8f83\u5feb<\/p>\n\n\n\n
\u8c03\u6574<\/h4>\n\n\n\n
resize \u5c3a\u5bf8\u53d1\u751f\u53d8\u5316\u5c31\u4f1a\u89e6\u53d1<\/p>\n\n\n\n
    <script>\n        window.addEventListener('load', function() {\n            var div = document.querySelector('div');\n            window.addEventListener('resize', function() {\n                console.log(window.innerWidth);\n\n                console.log('\u53d8\u5316\u4e86');\n                if (window.innerWidth <= 800) {\n                    div.style.display = 'none';\n                } else {\n                    div.style.display = 'block';\n                }\n\n            })\n        })\n    <\/script>\n    <div><\/div>\n<\/body>\n<\/code><\/pre>\n\n\n\n
\u8fd9\u91cc\u9700\u8981\u6ce8\u610f\u4e00\u4e2a\u53c2\u6570\uff0c\u83b7\u7a97\u53e3\u5c3a\u5bf8\uff0cwindow.innerWidth<\/p>\n\n\n\n
\u5b9a\u65f6\u5668<\/h3>\n\n\n\n
setTimeout()\u5b9a\u65f6\u5668<\/h4>\n\n\n\n
window.setTimeout(\u8c03\u7528\u51fd\u6570\uff0c[\u5ef6\u8fdf\u7684\u6beb\u79d2\u6570])<\/p>\n\n\n\n
\u8fd9\u4e2a\u8c03\u7528\u51fd\u6570\u53ef\u4ee5\u5199\u51fd\u6570\uff0c\u8fd8\u53ef\u4ee5\u76f4\u63a5\u5199\u51fd\u6570\u540d<\/p>\n\n\n\n
    <script>\n        \/\/ 1. setTimeout \n        \/\/ \u8bed\u6cd5\u89c4\u8303\uff1a  window.setTimeout(\u8c03\u7528\u51fd\u6570, \u5ef6\u65f6\u65f6\u95f4);\n        \/\/ 1. \u8fd9\u4e2awindow\u5728\u8c03\u7528\u7684\u65f6\u5019\u53ef\u4ee5\u7701\u7565\n        \/\/ 2. \u8fd9\u4e2a\u5ef6\u65f6\u65f6\u95f4\u5355\u4f4d\u662f\u6beb\u79d2 \u4f46\u662f\u53ef\u4ee5\u7701\u7565\uff0c\u5982\u679c\u7701\u7565\u9ed8\u8ba4\u7684\u662f0\n        \/\/ 3. \u8fd9\u4e2a\u8c03\u7528\u51fd\u6570\u53ef\u4ee5\u76f4\u63a5\u5199\u51fd\u6570 \u8fd8\u53ef\u4ee5\u5199 \u51fd\u6570\u540d \u8fd8\u6709\u4e00\u4e2a\u5199\u6cd5 '\u51fd\u6570\u540d()'\n        \/\/ 4. \u9875\u9762\u4e2d\u53ef\u80fd\u6709\u5f88\u591a\u7684\u5b9a\u65f6\u5668\uff0c\u6211\u4eec\u7ecf\u5e38\u7ed9\u5b9a\u65f6\u5668\u52a0\u6807\u8bc6\u7b26 \uff08\u540d\u5b57)\n        \/\/ setTimeout(function() {\n        \/\/     console.log('\u65f6\u95f4\u5230\u4e86');\n\n        \/\/ }, 2000);\n        function callback() {\n            console.log('\u7206\u70b8\u4e86');\n\n        }\n        var timer1 = setTimeout(callback, 3000);\n        var timer2 = setTimeout(callback, 5000);\n        \/\/ setTimeout('callback()', 3000); \/\/ \u6211\u4eec\u4e0d\u63d0\u5021\u8fd9\u4e2a\u5199\u6cd5\n    <\/script>\n<\/body>\n<\/code><\/pre>\n\n\n\n
setTimeout()\u4e5f\u88ab\u79f0\u4e3a\u56de\u8c03\u51fd\u6570<\/p>\n\n\n\n
5s\u9690\u85cf\u5e7f\u544a\u6848\u4f8b<\/h4>\n\n\n\n
5s\u540e\u9690\u85cf\u8d77\u6765\u5c31\u53ef\u4ee5\u4e86<\/p>\n\n\n\n
    <div>\n        <img src=\"\u7b2c\u4e09\u5929\/images\/wb.jpg\" alt=\"\">\n    <\/div>\n    <script>\n        var div = document.querySelector('div')\n        window.setTimeout(function(){\n            div.style.display = 'none';\n        },5000)\n    <\/script>\n<\/code><\/pre>\n\n\n\n
\u505c\u6b62\u5b9a\u65f6\u5668<\/h4>\n\n\n\n
window.clearTimeout(timeout ID)<\/p>\n\n\n\n
    <button>\u70b9\u51fb\u505c\u6b62\u5b9a\u65f6\u5668<\/button>\n    <script>\n        var btn = document.querySelector('button');\n        var timer = setTimeout(function() {\n            console.log('\u7206\u70b8\u4e86');\n\n        }, 5000);\/\/\u7ed9\u5b9a\u65f6\u5668\u52a0\u4e86\u4e00\u4e2a\u6807\u8bc6\u7b26timer\n        btn.addEventListener('click', function() {\n            clearTimeout(timer);\/\/\u505c\u6b62\u8fd9\u4e2a\u5b9a\u65f6\u5668\u91cc\u9762\u5199\u6807\u8bc6\u7b26\n        })\n    <\/script>\n<\/code><\/pre>\n\n\n\n
setInterval()\u5b9a\u65f6\u5668<\/h4>\n\n\n\n
window.setInterval(\u8c03\u7528\u51fd\u6570\uff0c[\u5ef6\u8fdf\u7684\u6beb\u79d2\u6570])<\/p>\n\n\n\n
\u8fd9\u4e2a\u8ddf\u4e0a\u9762\u7684\u533a\u522b\u5c31\u662f\u4e00\u65e6\u5f00\u542f\uff0c\u5c31\u4e00\u76f4\u6267\u884c\uff0c\u4e00\u76f4\u8c03\u7528<\/p>\n\n\n\n
    <script>\n        \/\/ 1. setInterval \n        \/\/ \u8bed\u6cd5\u89c4\u8303\uff1a  window.setInterval(\u8c03\u7528\u51fd\u6570, \u5ef6\u65f6\u65f6\u95f4);\n        setInterval(function() {\n            console.log('\u7ee7\u7eed\u8f93\u51fa');\n        }, 1000);\n        \/\/ 2. setTimeout  \u5ef6\u65f6\u65f6\u95f4\u5230\u4e86\uff0c\u5c31\u53bb\u8c03\u7528\u8fd9\u4e2a\u56de\u8c03\u51fd\u6570\uff0c\u53ea\u8c03\u7528\u4e00\u6b21 \u5c31\u7ed3\u675f\u4e86\u8fd9\u4e2a\u5b9a\u65f6\u5668\n        \/\/ 3. setInterval  \u6bcf\u9694\u8fd9\u4e2a\u5ef6\u65f6\u65f6\u95f4\uff0c\u5c31\u53bb\u8c03\u7528\u8fd9\u4e2a\u56de\u8c03\u51fd\u6570\uff0c\u4f1a\u8c03\u7528\u5f88\u591a\u6b21\uff0c\u91cd\u590d\u8c03\u7528\u8fd9\u4e2a\u51fd\u6570\n    <\/script>\n<\/code><\/pre>\n\n\n\n
\u4eac\u4e1c\u5012\u8ba1\u65f6\u6848\u4f8b<\/h4>\n\n\n\n
<body>\n    <div>\n        <span class=\"hour\">1<\/span>\n        <span class=\"minute\">2<\/span>\n        <span class=\"second\">3<\/span>\n    <\/div>\n    <script>\n        \/\/ 1. \u83b7\u53d6\u5143\u7d20 \n        var hour = document.querySelector('.hour'); \/\/ \u5c0f\u65f6\u7684\u9ed1\u8272\u76d2\u5b50\n        var minute = document.querySelector('.minute'); \/\/ \u5206\u949f\u7684\u9ed1\u8272\u76d2\u5b50\n        var second = document.querySelector('.second'); \/\/ \u79d2\u6570\u7684\u9ed1\u8272\u76d2\u5b50\n        var inputTime = +new Date('2019-5-1 18:00:00'); \/\/ \u8fd4\u56de\u7684\u662f\u7528\u6237\u8f93\u5165\u65f6\u95f4\u603b\u7684\u6beb\u79d2\u6570\n        countDown(); \/\/ \u6211\u4eec\u5148\u8c03\u7528\u4e00\u6b21\u8fd9\u4e2a\u51fd\u6570\uff0c\u9632\u6b62\u7b2c\u4e00\u6b21\u5237\u65b0\u9875\u9762\u6709\u7a7a\u767d \n        \/\/ 2. \u5f00\u542f\u5b9a\u65f6\u5668\n        setInterval(countDown, 1000);\n\n        function countDown() {\n            var nowTime = +new Date(); \/\/ \u8fd4\u56de\u7684\u662f\u5f53\u524d\u65f6\u95f4\u603b\u7684\u6beb\u79d2\u6570\n            var times = (inputTime - nowTime) \/ 1000; \/\/ times\u662f\u5269\u4f59\u65f6\u95f4\u603b\u7684\u79d2\u6570 \n            var h = parseInt(times \/ 60 \/ 60 % 24); \/\/\u65f6\n            h = h < 10 ? '0' + h : h;\n            hour.innerHTML = h; \/\/ \u628a\u5269\u4f59\u7684\u5c0f\u65f6\u7ed9 \u5c0f\u65f6\u9ed1\u8272\u76d2\u5b50\n            var m = parseInt(times \/ 60 % 60); \/\/ \u5206\n            m = m < 10 ? '0' + m : m;\n            minute.innerHTML = m;\n            var s = parseInt(times % 60); \/\/ \u5f53\u524d\u7684\u79d2\n            s = s < 10 ? '0' + s : s;\n            second.innerHTML = s;\n        }\n    <\/script>\n<\/code><\/pre>\n\n\n\n
\u518d\u6b21\u53d1\u9001\u77ed\u4fe1\u9700\u7b4960s\u518d\u70b9\u51fb\u6848\u4f8b<\/h4>\n\n\n\n
    <input type=\"text\">\n    <button>\n        \u53d1\u9001\u9a8c\u8bc1\u7801\n    <\/button>\n    <script>\n        var btn = document.querySelector('button');\n        var time = 60;\n        btn.addEventListener('click',function(){\n            btn.disabled = true;\n            btn.innerHTML = time + 's\u540e\u91cd\u65b0\u53d1\u9001';\n            var timer = setInterval(function(){\n                time--;\n                btn.innerHTML = time + 's\u540e\u91cd\u65b0\u53d1\u9001';\n                if(time == 0){\n                    clearInterval(timer);\n                    btn.disabled = false;\n                    btn.innerHTML = '\u53d1\u9001\u9a8c\u8bc1\u7801';\n                    time = 60;\/\/\u91cd\u7f6e\u65f6\u95f4\n                }\n            },1000)\n        })\n    <\/script>\n<\/code><\/pre>\n\n\n\n
this\u6307\u5411\u95ee\u9898<\/h3>\n\n\n\n
1.\u5168\u5c40\u4f5c\u7528\u57df\u6216\u8005\u666e\u901a\u51fd\u6570\u4e2d\u7684this\u6307\u5411\u7684\u5168\u5c40\u5bf9\u8c61window\uff0c\u5b9a\u65f6\u5668\u7684this\u6307\u5411\u7684\u4e5f\u662fWindow<\/p>\n\n\n\n
2.\u65b9\u6cd5\u4e2d\u7684this\uff0c\u6307\u5411\u7684\u4e5f\u662f\u8c03\u7528\u8005<\/p>\n\n\n\n
3.\u6784\u9020\u51fd\u6570\u4e2d\u7684this\u6307\u5411\u7684\u5b9e\u4f8b\u5bf9\u8c61<\/p>\n\n\n\n
js\u6267\u884c\u673a\u5236<\/h2>\n\n\n\n
js\u662f\u5355\u7ebf\u7a0b\u7684\uff0c\u8fd9\u53ef\u80fd\u4f1a\u9020\u6210\u4e00\u4e2a\u4efb\u52a1\u6267\u884c\u592a\u957f\uff0c\u540e\u9762\u7684\u8fd8\u6ca1\u5b8c\u6210\uff0c\u5bfc\u81f4\u6e32\u67d3\u4e0d\u8fde\u8d2f\u3002<\/p>\n\n\n\n
\u540c\u6b65\u548c\u5f02\u6b65<\/h3>\n\n\n\n
\u4e3a\u4e86\u89e3\u51b3\u7ebf\u7a0b\u95ee\u9898\uff0c\u5728html5\u4e2d\u63d0\u51fa\u4e86webworker\u6807\u51c6\uff0c\u5141\u8bb8js\u521b\u5efa\u591a\u4e2a\u7ebf\u7a0b\uff0c\u5c31\u51fa\u73b0\u4e86\u540c\u6b65\u548c\u5f02\u6b65\u3002<\/p>\n\n\n\n
\u540c\u6b65\uff1a<\/p>\n\n\n\n
\u524d\u4e00\u4e2a\u4efb\u52a1\u7ed3\u675f\u540e\u518d\u6267\u884c\u540e\u4e00\u4e2a\u4efb\u52a1\uff0c\u7a0b\u5e8f\u7684\u6267\u884c\u987a\u5e8f\u548c\u4efb\u52a1\u7684\u987a\u5e8f\u662f\u4e00\u81f4\u7684\uff0c\u540c\u6b65\u7684\u3002\u3001<\/p>\n\n\n\n
\u6bd4\u5982\uff1a\u6211\u4eec\u8981\u70e7\u6c34\u716e\u996d\uff0c\u70e7\u6c34\u898110\u5206\u949f\uff0c\u7b49\u6c34\u5f00\u4e86\u518d\u53bb\u505a\u996d\uff0c\u5e76\u4e0d\u5408\u7406<\/p>\n\n\n\n
\u5f02\u6b65\uff1a<\/p>\n\n\n\n
\u5728\u505a\u4e00\u4ef6\u4e8b\u7684\u65f6\u5019\uff0c\u53c8\u53ef\u4ee5\u53bb\u505a\u53e6\u4e00\u4ef6\u4e8b\u3002<\/p>\n\n\n\n
js\u4e2d\u662f\u5982\u4f55\u5904\u7406<\/h3>\n\n\n\n
js\u4e2d\u6709\u4e2a\u6267\u884c\u6808\uff0c\u5148\u770b\u540c\u6b65\u4efb\u52a1\uff0c\u5982\u679c\u6ca1\u6709\u56de\u8c03\u51fd\u6570\uff0c\u90a3\u90fd\u662f\u540c\u6b65\u4efb\u52a1\uff0c\u5982\u679c\u9047\u5230\u56de\u8c03\u51fd\u6570,\u5982\u5b9a\u65f6\u5668\u51fd\u6570\u5c31\u653e\u5230\u5f02\u6b65\u4efb\u52a1\u4e2d\uff0c\u90a3\u5c31\u5148\u628a\u540c\u6b65\u4efb\u52a1\u5b8c\u6210\uff0c\u518d\u5b8c\u6210\u5f02\u6b65\u4efb\u52a1\u3002<\/p>\n\n\n\n
    console.log(1);\n    setTimeout(() => {\n        console.log(3);\n        \n    }, 0);\n    console.log(2);\n\/\/\u7ed3\u679c\u662f1\uff0c2\uff0c3\n<\/code><\/pre>\n\n\n\n
\u8fd9\u91cc\u6d89\u53ca\u591a\u4e2a\u540d\u5b57\uff0c\u591a\u4e86\u4e2a \u5f02\u6b65\u8fdb\u7a0b\u5904\u7406\uff0c\u548c\u4e8b\u4ef6\u5faa\u73af\uff08\u6709\u9700\u8981\u770bppt\uff09<\/p>\n\n\n\n
location\u5bf9\u8c61<\/h2>\n\n\n\n
location\u5bf9\u8c61\u5c5e\u6027<\/p>\n\n\n\n
location.href \u83b7\u53d6\u6216\u8005 \u8bbe\u7f6e\u6574\u4e2aurl<\/p>\n\n\n\n
location.host \u8fd4\u56de\u4e3b\u673a \u57df\u540d<\/p>\n\n\n\n
location.port \u8fd4\u56de\u7aef\u53e3\u53f7 \u6ca1\u6709\u8fd4\u56de\u5c31\u8fd4\u56de\u7a7a\u5b57\u7b26\u4e32<\/p>\n\n\n\n
location.path \u8fd4\u56de\u8def\u5f84<\/p>\n\n\n\n
location.search \u8fd4\u56de\u53c2\u6570<\/p>\n\n\n\n
location.hash \u8fd4\u56de\u7247\u6bb5\uff0c\u8fd4\u56de\u951a\u70b9\u94fe\u63a5#\u540e\u9762\u90e8\u5206<\/p>\n\n\n\n
\/\/\u6848\u4f8b\u83b7\u53d6\u63d0\u4ea4\u7684\u6570\u636e\nindex.html\n    <div><\/div>\n    <script>\n        console.log(location.search); \/\/ ?uname=andy\n        \/\/ 1.\u5148\u53bb\u6389\uff1f  substr('\u8d77\u59cb\u7684\u4f4d\u7f6e'\uff0c\u622a\u53d6\u51e0\u4e2a\u5b57\u7b26);\n        var params = location.search.substr(1); \/\/ uname=andy\n        console.log(params);\n        \/\/ 2. \u5229\u7528=\u628a\u5b57\u7b26\u4e32\u5206\u5272\u4e3a\u6570\u7ec4 split('=');\n        var arr = params.split('=');\n        console.log(arr); \/\/ [\"uname\", \"ANDY\"]\n        var div = document.querySelector('div');\n        \/\/ 3.\u628a\u6570\u636e\u5199\u5165div\u4e2d\n        div.innerHTML = arr[1] + '\u6b22\u8fce\u60a8';\n    <\/script>\n<\/body>\n<\/code><\/pre>\n\n\n\n
    <form action=\"index.html\">\n        \u7528\u6237\u540d\uff1a <input type=\"text\" name=\"uname\">\n        <input type=\"submit\" value=\"\u767b\u5f55\">\n    <\/form>\/\/login.html\n<\/code><\/pre>\n\n\n\n
\u8fd9\u4e2a\u6848\u4f8b\u4e3b\u8981\u662f\u5206\u9694\u5b57\u7b26\u4e32\uff0csubstr\u548csplit\u7684\u65b9\u6cd5\u4f7f\u7528\u3002<\/p>\n\n\n\n
location.assign()\u8ddfhref\u4e00\u6837\uff0c\u53ef\u4ee5\u8df3\u8f6c\u9875\u9762\uff0c\u4e5f\u79f0\u4e3a\u91cd\u5b9a\u5411\u9875\u9762\uff08\u53ef\u4ee5\u8bb0\u5f55\u6d4f\u89c8\u5386\u53f2\uff0c\u53ef\u4ee5\u540e\u9000\uff09<\/p>\n\n\n\n
location.replace\u867d\u7136\u4e5f\u53ef\u4ee5\u8df3\u8f6c\u9875\u9762\uff0c\u4f46\u662f\u4e0d\u8bb0\u5f55\u6d4f\u89c8\u9875\u9762\uff0c\u4e0d\u80fd\u56de\u9000<\/p>\n\n\n\n
location.reload\u91cd\u65b0\u5237\u65b0\u6211\u4eec\u7684\u9875\u9762\u3002\u76f8\u5f53\u4e8e\u5237\u65b0\u6309\u94ae\uff0c\u6216\u8005F5\uff0c\u5982\u4f55\u53c2\u6570\u4e3atrue\u5c31\u662f\u5f3a\u5236\u5237\u65b0ctrl+F5<\/p>\n\n\n\n
navigator\u5bf9\u8c61<\/h2>\n\n\n\n
\u5bf9\u8c61\u5305\u542b\u5173\u4e8e\u6d4f\u89c8\u5668\u7684\u4fe1\u606f\uff0c\u53ef\u4ee5\u8fd4\u56de\u6709\u5ba2\u6237\u7aef\u53d1\u9001\u670d\u52a1\u5668\u7684user-agent\u7684\u5934\u90e8\u4fe1\u606f<\/p>\n\n\n\n
history\u5bf9\u8c61<\/h2>\n\n\n\n
back()\u540e\u9000<\/p>\n\n\n\n
forward()\u524d\u8fdb<\/p>\n\n\n\n
go(\u53c2\u6570)\u586b1\u5c31\u662f\u524d\u8fdb1\uff0c\u586b-2\u5c31\u662f\u540e\u9000<\/p>\n\n\n\n
\u672c\u5730\u5b58\u50a8<\/h2>\n\n\n\n
localStorage<\/h3>\n\n\n\n
1.\u6570\u636e\u5b58\u50a8\u5728\u7528\u6237\u7684\u6d4f\u89c8\u5668\u91cc\u9762<\/p>\n\n\n\n
2.\u8bbe\u7f6e\u548c\u8bfb\u53d6\u65b9\u4fbf\uff0c\u9875\u9762\u5237\u65b0\u4e5f\u4e0d\u4f1a\u4e22\u5931\u6570\u636e<\/p>\n\n\n\n
\u4f5c\u7528\uff1a\u53ef\u4ee5\u628a\u6570\u636e\u6c38\u4e45\u7684\u5b58\u50a8\u5728\u7528\u6237\u7684\u7535\u8111\u4e0a\uff0c\u9664\u975e\u624b\u52a8\u5220\u9664\uff0c\u5426\u5219\u5173\u95ed\u9875\u9762\u4e5f\u4f1a\u5b58\u5728<\/p>\n\n\n\n
\u7279\u5f81\uff1a\u591a\u7a97\u53e3\u5171\u4eab<\/p>\n\n\n\n
\u4ee5\u952e\u503c\u5bf9\u7684\u5f62\u5f0f\u5b58\u50a8<\/p>\n\n\n\n
localStorage.setItem(key, value);\n<\/code><\/pre>\n\n\n\n
\u8bfb\u53d6\u6570\u636e<\/p>\n\n\n\n
localStorage.getItem(key);\n<\/code><\/pre>\n\n\n\n
\u5220\u9664\u672c\u5730\u5b58\u50a8 \u53ea\u5220\u9664\u540d\u5b57<\/p>\n\n\n\n
localStorage.removeItem(key);\n<\/code><\/pre>\n\n\n\n
\u67e5\u770b\uff0c\u5728\u6d4f\u89c8\u5668\u7684\u5f00\u53d1\u8005\u5de5\u5177\u91cc\u7684\u5e94\u7528\u91cc\u9762\u672c\u5730\u5b58\u50a8\u91cc\u9762\u627e<\/p>\n\n\n\n
\u6539\u6570\u636e<\/p>\n\n\n\n
        localStorage.setItem('key', 'value');\n        localStorage.setItem('key','\u6539');\n<\/code><\/pre>\n\n\n\n
\u672c\u5730\u5b58\u50a8\u53ea\u80fd\u5b58\u653e\u5b57\u7b26\u4e32\u6570\u636e\u7c7b\u578b<\/strong>\u3002\u952e\u4e00\u5b9a\u662f\u8981\u52a0\u5f15\u53f7<\/p>\n\n\n\n
sessionStorage<\/h3>\n\n\n\n
\u7279\u5f81\uff1a\u751f\u547d\u5468\u671f\u4e3a\u5173\u95ed\u6d4f\u89c8\u5668\u7a97\u53e3<\/p>\n\n\n\n
\u5728\u540c\u4e00\u7a97\u53e3\u4e0b\u6570\u636e\u53ef\u4ee5\u5171\u4eab<\/p>\n\n\n\n
\u5176\u4ed6\u8ddflocalStorage\u5dee\u4e0d\u591a<\/p>\n\n\n\n
\u5b58\u50a8\u590d\u6742\u7684\u5bf9\u8c61\u7c7b\u578b<\/h3>\n\n\n\n
\u5b58<\/h4>\n\n\n\n
\u5047\u5982\u8981\u5b58\u50a8\u4e00\u4e2a\u5bf9\u8c61\u8fdb\u53bb\u672c\u5730<\/p>\n\n\n\n
    <script>\n        const obj = {\n            name: '\u5f20\u4e09',\n            age: 18,\n            sex: '\u7537'\n        }\n        localStorage.setItem('obj', obj);\/\/\u8fd9\u79cd\u65b9\u5f0f\u5b58\u8fdb\u53bb\u4e86\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u867d\u7136\u5b58\u8fdb\u53bb\u4e86\uff0c\u4f46\u662f\u53d6\u4e0d\u51fa\u6765\uff0c\u7528\u4e0d\u4e86\n        \/\/\u8fd9\u4e2a\u65f6\u5019\u5c31\u4e0d\u80fd\u8fd9\u4e48\u64cd\u4f5c\u4e86\uff0c\u5c31\u5fc5\u987b\u901a\u8fc7\u4e00\u4e2a\u8f6c\u6362\u4e3ajson\u683c\u5f0f\u624d\u884c\n        localStorage.setItem('obj', JSON.stringify(obj));\/\/\u8fd9\u6837\u5b58\u8fdb\u53bb\u7684\u5c31\u662f\u4e00\u4e2a\u5b57\u7b26\u4e32\u4e86\n        \/\/\u53d6\u51fa\u6765\u7684\u65f6\u5019\uff0c\u9700\u8981\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5bf9\u8c61\n        const obj1 = JSON.parse(localStorage.getItem('obj'));\n        console.log(obj1);\/\/\u8fd9\u6837\u5c31\u53ef\u4ee5\u53d6\u51fa\u6765\u4e86\n    <\/script>\n<\/code><\/pre>\n\n\n\n
JSON.stringify(obj)<\/p>\n\n\n\n
\u8f6c\u4e3aJSON\u5bf9\u8c61\uff0c\u90fd\u6709\u5f15\u53f7\uff0c\u7edf\u4e00\u7528\u53cc\u5f15\u53f7<\/p>\n\n\n\n
json\u683c\u5f0f\u5c31\u662f\u952e\u503c\u90fd\u662f\u6709\u4e24\u4e2a\u5f15\u53f7\u5f15\u8d77\u6765\u7684\u5b57\u7b26\u4e32\uff0c\u957f\u5f97\u548c\u5bf9\u8c61\u5f88\u50cf\uff0c\u4f46\u662f\u6709\u5f15\u53f7<\/p>\n\n\n\n
\u53d6<\/h4>\n\n\n\n
\u5c06JSON\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5bf9\u8c61\u3002<\/p>\n\n\n\n
JSON.parse\uff08\uff09\u5c06\u5b57\u7b26\u4e32\u8f6c\u4e3a\u5bf9\u8c61<\/p>\n\n\n\n
        console.log(localStorage.getItem('obj'));\/\/\u8fd9\u6837\u53d6\u51fa\u6765\u7684\u662f\u5b57\u7b26\u4e32\n        console.log(JSON.parse(localStorage.getItem('obj')));\/\/\u8fd9\u6837\u53d6\u51fa\u6765\u7684\u662f\u5bf9\u8c61\n<\/code><\/pre>\n\n\n\n
\u6570\u7ec4\u7684map\u65b9\u6cd5 \u8fed\u4ee3\u6570\u7ec4<\/h3>\n\n\n\n
\u904d\u5386\u6570\u7ec4\u5904\u7406\u6570\u636e\u5e76\u8fd4\u56de\u65b0\u7684\u6570\u7ec4<\/p>\n\n\n\n
map\u4e5f\u88ab\u79f0\u4e3a\u6620\u5c04\u3002map\u91cd\u70b9\u5728\u4e8e\u6709\u8fd4\u56de\u503c\uff0cforeach\u6ca1\u6709\u8fd4\u56de\u503c<\/p>\n\n\n\n
join\u65b9\u6cd5<\/h3>\n\n\n\n
\u5c06\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u62fc\u63a5\u6210\u4e00\u4e2a\u5b57\u7b26\u4e32<\/p>\n\n\n\n
arr.join(”);<\/p>\n\n\n\n
\u5982\u679c\u7528\u7a7a\u5b57\u7b26\u4e32\uff0c\u5219\u5143\u7d20\u6ca1\u6709\u5206\u9694\uff0c\u8fde\u5728\u4e00\u8d77\u7684<\/p>\n\n\n\n
\u5c0f\u62ec\u53f7\u4e3a\u7a7a\uff0c\u9ed8\u8ba4\u7528\u9017\u53f7\u5206\u9694\u3002<\/p>\n\n\n\n
\u6b63\u5219\u8868\u8fbe\u5f0f<\/h2>\n\n\n\n
\u6b63\u5219\u8868\u8fbe\u5f0f\u662f\u4e00\u79cd\u6a21\u5f0f\uff0c\u4e5f\u662f\u4e00\u79cd\u5bf9\u8c61<\/p>\n\n\n\n
const str = 'hello world'\nconst re = \/\u524d\u7aef\/\nconsole.log(re.test(str));\n \/\/ false\n<\/code><\/pre>\n\n\n\n
re\u662f\u89c4\u5219<\/p>\n\n\n\n
str\u662f\u88ab\u68c0\u6d4b\u5f97\u5b57\u7b26\u4e32<\/p>\n\n\n\n
re.test(str)<\/p>\n\n\n\n
\u8fd9\u662f\u5199\u6cd5<\/p>\n\n\n\n
re.exec(str)\u8fd9\u662f\u8fd4\u56de\u6570\u7ec4<\/p>\n\n\n\n
\u5143\u5b57\u7b26<\/h3>\n\n\n\n
^    \u4ee5\u4ec0\u4e48\u5f00\u59cb\n$\t \u4ee5\u4ec0\u4e48\u7ed3\u5c3e\n<\/code><\/pre>\n\n\n\n
\u5b57\u7b26\u7c7b<\/p>\n\n\n\n
[]\u5339\u914d\u5b57\u7b26\u96c6\u5408<\/p>\n\n\n\n
{}\u524d\u9762\u7684\u5b57\u7b26\u4e2a\u6570<\/p>\n\n\n\n
. \u5339\u914d\u9664\u6362\u884c\u7b26\u5916\u7684\u4efb\u610f\u5b57\u7b26<\/p>\n\n\n\n
\u9884\u5b9a\u4e49\u7c7b<\/p>\n\n\n\n
\\d \u76f8\u5f53\u4e8e[0-9]<\/p>\n\n\n\n
\\w \u76f8\u5f53\u4e8e[A-Za-z0-9]<\/p>\n\n\n\n
\u4fee\u9970\u7b26<\/p>\n\n\n\n
\/\u8868\u8fbe\u5f0f\/\u4fee\u9970\u7b26<\/p>\n\n\n\n
\u4fee\u9970\u7b26\uff0cg\u662f\u5168\u5c40\u5339\u914d\uff0ci\u662f\u533a\u5206\u5927\u5c0f\u5199<\/p>\n\n\n\n
JS\u8fdb\u9636<\/h1>\n\n\n\n
\u5168\u5c40\u4f5c\u7528\u57df\u548c\u5c40\u90e8\u4f5c\u7528\u57df\uff08\u51fd\u6570\u4f5c\u7528\u57df\uff0c\u5757\u7ea7\u4f5c\u7528\u57df\uff09<\/p>\n\n\n\n
let \u548cconst\u90fd\u662f\u5757\u7ea7\u4f5c\u7528\u57df<\/p>\n\n\n\n
var\u6ca1\u6709\u5757\u7ea7\u4f5c\u7528\u57df\u3002<\/p>\n\n\n\n
\u5c11\u7528\u5168\u5c40\u53d8\u91cf\uff0c\u9632\u6b62\u53d8\u91cf\u88ab\u6c61\u67d3\u3002<\/p>\n\n\n\n
script\u6807\u7b7e\u548cjs\u6587\u4ef6\u91cc\u7684\u6700\u9876\u5c42\u7684\u5c31\u662f\u5168\u5c40\u4f5c\u7528\u57df<\/p>\n\n\n\n
\u4f5c\u7528\u57df\u94fe<\/h2>\n\n\n\n
\u4f5c\u7528\u57df\u94fe\u7684\u672c\u8d28\u662f\u5e95\u5c42\u7684\u53d8\u91cf\u67e5\u627e\u673a\u5236<\/p>\n\n\n\n
\u51fd\u6570\u88ab\u6267\u884c\u7684\u65f6\u5019\uff0c\u4f1a\u4f18\u5148\u67e5\u627e\u5f53\u524d\u51fd\u6570\u4f5c\u7528\u57df\u4e2d\u67e5\u627e\u53d8\u91cf<\/p>\n\n\n\n
\u5982\u679c\u5f53\u524d\u4f5c\u7528\u57df\u67e5\u4e0d\u5230\u5219\u4f1a\u4f9d\u6b21\u9010\u7ea7\u67e5\u627e\u7236\u7ea7\u4f5c\u7528\u57df\u76f4\u5230\u5168\u5c40\u4f5c\u7528\u57df\u3002<\/p>\n\n\n\n
\u5783\u573e\u56de\u6536\u673a\u5236<\/h2>\n\n\n\n
js\u4e2d\u7684\u5185\u5b58\u5206\u914d\u548c\u56de\u6536\u90fd\u662f\u81ea\u52a8\u5b8c\u6210\u7684\uff0c\u5185\u5b58\u5728\u4e0d\u9002\u7528\u7684\u65f6\u5019\u4f1a\u88ab\u5783\u573e\u56de\u6536\u5668\u81ea\u52a8\u56de\u6536<\/p>\n\n\n\n
js\u73af\u5883\u4e2d\u5206\u914d\u7684\u5185\u5b58\uff0c\u4e00\u822c\u6709\u5982\u4e0b\u7684\u751f\u547d\u5468\u671f\uff1a 1.\u5185\u5b58\u5206\u914d<\/p>\n\n\n\n
2.\u5185\u5b58\u4f7f\u7528<\/p>\n\n\n\n
3.\u5185\u5b58\u56de\u6536<\/p>\n\n\n\n
\u5168\u5c40\u53d8\u91cf\u4e00\u822c\u4e0d\u56de\u6536<\/p>\n\n\n\n
\u4e00\u822c\u60c5\u51b5\u4e0b\u5c40\u90e8\u53d8\u91cf\u7684\u503c\uff0c\u4f1a\u88ab\u81ea\u52a8\u56de\u6536\u6389\u3002<\/p>\n\n\n\n
\u5185\u5b58\u6cc4\u6f0f<\/strong>\uff1a\u7a0b\u5e8f\u4e2d\u5206\u914d\u7684\u5185\u5b58\u7531\u4e8e\u67d0\u79cd\u539f\u56e0\u7a0b\u5e8f\u672a\u91ca\u653e\u53eb\u505a\u5185\u5b58\u6cc4\u6f0f<\/strong><\/p>\n\n\n\n
\u5f15\u7528\u8ba1\u6570\uff1a<\/p>\n\n\n\n
\u53ea\u8981\u6570\u636e\u7c7b\u578b\u6ca1\u6709\u6ca1\u5f15\u7528\u4e86<\/strong>\uff0c\u5c31\u56de\u6536<\/p>\n\n\n\n
\u6807\u8bb0\u6e05\u9664\u6cd5\uff1a<\/p>\n\n\n\n
\u73b0\u4ee3\u6d4f\u89c8\u5668\u5df2\u7ecf\u4e0d\u7528\u5f15\u7528\u8ba1\u6570\u4e86\uff0c\u90fd\u7528\u6807\u8bb0\u8ba1\u6570\u3002<\/p>\n\n\n\n
\u6838\u5fc3\u7b97\u6cd5\uff1a<\/p>\n\n\n\n
1.\u6807\u8bb0\u6e05\u9664\u7b97\u6cd5\u5c06\u2019\u4e0d\u518d\u4f7f\u7528\u7684\u5bf9\u8c61\u2018\u5b9a\u4e49\u4e3a\u2019\u65e0\u6cd5\u8fbe\u5230\u7684\u5bf9\u8c61\u2018<\/p>\n\n\n\n
2.\u5c31\u662f\u4ece\u6839\u90e8\u51fa\u53d1\u5b9a\u65f6\u626b\u63cf\u5185\u5b58\u4e2d\u7684\u5bf9\u8c61\u3002\u51e1\u662f\u80fd\u591f\u4ece\u6839\u90e8\u5230\u8fbe\u7684\u5bf9\u8c61\uff0c\u90fd\u662f\u9700\u8981\u4f7f\u7528\u7684\u3002<\/p>\n\n\n\n
3.\u65e0\u6cd5\u7531\u6839\u90e8\u89e6\u53d1\u89e6\u53ca\u5230\u7684\u5bf9\u8c61\u88ab\u6807\u8bb0\u4e3a\u4e0d\u518d\u4f7f\u7528\uff0c\u7a0d\u540e\u8fdb\u884c\u56de\u6536\u3002<\/p>\n\n\n\n
\u95ed\u5305<\/h2>\n\n\n\n
\u6982\u5ff5\uff1a\u4e00\u4e2a\u51fd\u6570\u5bf9\u5468\u56f4\u72b6\u6001\u7684\u5f15\u7528\u6346\u7ed1\u5728\u4e00\u8d77\uff0c\u5185\u5c42\u51fd\u6570\u4e2d\u8bbf\u95ee\u5230\u5916\u5c42\u51fd\u6570\u7684\u4f5c\u7528\u57df<\/p>\n\n\n\n
\u7b80\u5355\u7406\u89e3\uff1a\u95ed\u5305=\u5185\u5c42\u51fd\u6570+\u5916\u5c42\u51fd\u6570\u7684\u53d8\u91cf<\/p>\n\n\n\n
function close_package(){\n    let a = 1;\/\/const\u4e5f\u53ef\u4ee5\n    function func(){\n        console.log(a); \/\/ 1\n    }\n    func();\n}\nclose_package();\n<\/code><\/pre>\n\n\n\n
\u91cc\u9762\u7684\u51fd\u6570\u5c31\u7528\u5230\u4e86\u5916\u9762\u7684\u5e38\u91cfa<\/p>\n\n\n\n
\u95ed\u5305\u7684\u57fa\u672c\u683c\u5f0f<\/p>\n\n\n\n
function close_package(){\n    let a = 1;\/\/const\u4e5f\u53ef\u4ee5\n    function func(){\n        console.log(a); \/\/ 1\n    }\n    return func;\n}\nconst fun = close_package();\nfun();\n<\/code><\/pre>\n\n\n\n
\u95ed\u5305\u7684\u4f5c\u7528\uff0c\u60f3\u8ba9\u5916\u90e8\u7684\u51fd\u6570\u8bbf\u95ee\u5185\u90e8\u7684\u53d8\u91cf<\/strong><\/p>\n\n\n\n
\u53ef\u4ee5\u4fdd\u62a4\u53d8\u91cf\u79c1\u6709\u3002<\/p>\n\n\n\n
\u95ed\u5305\u7684\u5e94\u7528 \u7edf\u8ba1\u51fd\u6570\u88ab\u8c03\u7528\u7684\u6b21\u6570<\/strong><\/p>\n\n\n\n
\/\/\u5047\u5982\u662f\u539f\u6765\u8fd9\u79cd\u5199\u6cd5\uff0c\u8fd9\u4e2a\u53d8\u91cfa\u662f\u5168\u5c40\u53d8\u91cf\u5bb9\u6613\u88ab\u4fee\u6539\nlet a = 0;\nfunction test() {\n    a++\n    console.log(a)\n}\n<\/code><\/pre>\n\n\n\n
\u91c7\u7528\u95ed\u5305\u7684\u5f62\u5f0f<\/p>\n\n\n\n
function fn1(){\n    let i = 0;\n    function fn2(){\n        i++\n        console.log(i)\n        \n    }\n    return fn2\n}\nconst out = fn1()\n<\/code><\/pre>\n\n\n\n
\u73b0\u5728\u5c31\u5728\u5916\u9762\u8bbf\u95ee\u4e0d\u4e86\u4e86\uff0c\u592a\u5999\u5999\u5c4b\u4e86<\/p>\n\n\n\n
\u53d8\u91cf\u63d0\u5347<\/h2>\n\n\n\n
\u53d8\u91cf\u63d0\u5347\u662fjs\u7684\u7f3a\u9677\uff0c\u5b83\u5141\u8bb8\u5728\u53d8\u91cf\u58f0\u660e\u4e4b\u524d\u88ab\u8bbf\u95ee\uff08\u4ec5\u5b58\u5728var \u58f0\u660e\u53d8\u91cf\uff09<\/p>\n\n\n\n
\u8fd9\u4e2a\u8ddf\u6211\u4eec\u524d\u9762\u7684js\u9884\u5904\u7406\u673a\u5236\u5dee\u4e0d\u591a\u3002<\/p>\n\n\n\n
\u6240\u4ee5\u51fa\u73b0\u4e86let \u548cconst\u6765\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898<\/p>\n\n\n\n
console.log(\"\u8fd9\u662f\u6d4b\u8bd5\u53d8\u91cf\u63d0\u5347         \"+a);\nvar a = 1;\n\/\/\u8fd9\u662f\u6d4b\u8bd5\u53d8\u91cf\u63d0\u5347         undefined\n<\/code><\/pre>\n\n\n\n
\u5176\u5b9e\u5c31\u662f\u5148<\/p>\n\n\n\n
var a;\nconsole.log(\"\u8fd9\u662f\u6d4b\u8bd5\u53d8\u91cf\u63d0\u5347         \"+a);\na = 1;\n\/\/\u6240\u4ee5\u5148\u58f0\u660e\uff0c\u4e0d\u8d4b\u503c\uff0c\u6240\u4ee5\u662f\u672a\u5b9a\u4e49\n<\/code><\/pre>\n\n\n\n
\u53d8\u91cf\u63d0\u5347\uff0c\u53ea\u63d0\u5347\u58f0\u660e\uff0c\u4e0d\u63d0\u793a\u8d4b\u503c\uff0c\u5e76\u4e14\u662f\u63d0\u5347\u5230\u5f53\u524d\u4f5c\u7528\u57df<\/strong><\/p>\n\n\n\n
console.log(\"\u8fd9\u662f\u6d4b\u8bd5\u53d8\u91cf\u63d0\u5347         \"+a);\nlet a = 1;\n\/\/\u62a5\u9519\n<\/code><\/pre>\n\n\n\n
\u51fd\u6570\u63d0\u5347<\/h2>\n\n\n\n
\u4e0e\u53d8\u91cf\u63d0\u5347\u6bd4\u8f83\u7c7b\u4f3c\uff0c\u51fd\u6570\u5728\u58f0\u660e\u4e4b\u524d\u5c31\u53ef\u4ee5\u88ab\u8c03\u7528<\/p>\n\n\n\n
fun1()\nfunction fun1(){\n    console.log('fun1');    \n}\n\/\/result = fun1()\n<\/code><\/pre>\n\n\n\n
\u5176\u5b9e\u5c31\u662f<\/p>\n\n\n\n
function fun1(){\n    console.log('fun1');    \n}\nfun1()\n<\/code><\/pre>\n\n\n\n
\u51fd\u6570\u63d0\u5347\u4f1a\u628a\u51fd\u6570\u58f0\u660e\u63d0\u5347\u5230\u5f53\u524d\u7684\u4f5c\u7528\u57df\u7684\u6700\u524d\u9762<\/p>\n\n\n\n
\u5728\u51fd\u6570\u8868\u8fbe\u5f0f\u5199\u6cd5\u7684\u90a3\u91cc\u5c31\u4f1a\u51fa\u95ee\u9898<\/p>\n\n\n\n
fn()\nvar fn = function(){\n    console.log('fn')\n}\n<\/code><\/pre>\n\n\n\n
\u76f8\u5f53\u4e8e<\/p>\n\n\n\n
 var fn\n fn()\n \/\/fn\u662f\u4e2a\u53d8\u91cf\u7684\uff0c\u4e0d\u80fd\u88ab\u8c03\u7528\n<\/code><\/pre>\n\n\n\n
\u51fd\u6570\u8fdb\u9636<\/h2>\n\n\n\n
\u52a8\u6001\u53c2\u6570<\/h3>\n\n\n\n
agruments\u7684\u4f7f\u7528<\/p>\n\n\n\n
\u524d\u9762\u6709\u8bf4<\/p>\n\n\n\n
\u51fd\u6570\u5269\u4f59\u53c2\u6570<\/h3>\n\n\n\n
\u5269\u4f59\u53c2\u6570\u5141\u8bb8\u6211\u4eec\u5c06\u4e00\u4e2a\u4e0d\u5b9a\u6570\u91cf\u7684\u53c2\u6570\u8868\u793a\u6210\u4e00\u4e2a\u6570\u7ec4<\/p>\n\n\n\n
function getsum(...arr){\n    console.log(arr);   \n}\ngetsum(1,2,3)\ngetsum(1,2)\n\/\/ [1, 2, 3]\n\/\/  [1, 2]\n<\/code><\/pre>\n\n\n\n
…\u5c31\u662f\u5269\u4f59\u53c2\u6570<\/p>\n\n\n\n
\u4e24\u8005\u533a\u522b<\/h3>\n\n\n\n
1.\u5269\u4f59\u53c2\u6570\uff0c\u5c31\u662f\u524d\u9762\u7684\u53c2\u6570\u53ef\u4ee5\u5141\u8bb8\u81ea\u5b9a\u4e49\uff0c\u6240\u4ee5\u66f4\u52a0\u7075\u6d3b<\/p>\n\n\n\n
\u5047\u8bbe\uff0c\u5141\u8bb8\u7528\u6237\u8f93\u5165\u4e24\u4e2a\u53c2\u6570\uff0c\u5176\u4ed6\u4efb\u610f<\/p>\n\n\n\n
\/\/\u4f8b\u5982\nfunction test (a,b,...arr){\n\n}\/\/\u8fd9\u91cc\u53ef\u4ee5\u5199\u4e24\u4e2a\u5f62\u53c2a,b\n<\/code><\/pre>\n\n\n\n
2.\u5269\u4f59\u53c2\u6570\u662f\u4e00\u4e2a\u771f\u6570\u7ec4\uff0c\u53ef\u4ee5\u7528\u6570\u7ec4\u7684\u65b9\u6cd5\uff0c\u800cagrument\u662f\u4f2a\u6570\u7ec4\uff0c\u4e0d\u80fd\u7528\u6570\u7ec4\u7684\u65b9\u6cd5\u3002<\/p>\n\n\n\n
\u5269\u4f59\u53c2\u6570\u7684\u573a\u666f\uff0c\u7528\u4e8e\u83b7\u53d6\u591a\u4f59\u7684\u53c2\u6570\u3002<\/p>\n\n\n\n
\u5c55\u5f00\u8fd0\u7b97\u7b26<\/h3>\n\n\n\n
\u5c55\u5f00\u8fd0\u7b97\u7b26\uff08…\uff09\u53ef\u4ee5\u628a\u6570\u7ec4\u7ed9\u5c55\u5f00<\/p>\n\n\n\n
const arr = [1,2,3,4,5,6,7,8,9,10];\nconsole.log(...arr);\n<\/code><\/pre>\n\n\n\n
const arr = [1,2,3,4,5,6,7,8,9,10];\nconsole.log(...arr);\nconsole.log(arr);\n\/\/(1) 1,2,3,4,5,6,7,8,9,10\n\/\/(10) [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]\n<\/code><\/pre>\n\n\n\n
\u8bf4\u660e\uff1a<\/p>\n\n\n\n
1.\u4e0d\u4f1a\u4fee\u6539\u539f\u6570\u7ec4<\/p>\n\n\n\n
\u5178\u578b\u4f7f\u7528\u573a\u666f\uff0c\u6c42\u6570\u7ec4\u6700\u5927\u503c<\/p>\n\n\n\n
const arr = [1,2,3,4,5,6,7,8,9,10];\nconsole.log(Math.max(...arr))\n<\/code><\/pre>\n\n\n\n
\u7bad\u5934\u51fd\u6570\uff08\u975e\u5e38\u91cd\u8981\uff09<\/h3>\n\n\n\n
\u76ee\u7684\uff1a\u5f15\u8fdb\u7bad\u5934\u51fd\u6570\u7684\u76ee\u7684\u662f\u7528\u66f4\u7b80\u77ed\u7684\u51fd\u6570\u5199\u6cd5\u5e76\u4e14\u4e0d\u7ed1\u5b9athis\uff0c\u7bad\u5934\u7684\u51fd\u6570\u7684\u8bed\u6cd5\u6bd4\u51fd\u6570\u66f4\u7b80\u6d01<\/p>\n\n\n\n
\u4f7f\u7528\u573a\u666f\uff1a\u7bad\u5934\u51fd\u6570\u66f4\u9002\u5408\u7528\u4e8e\u9700\u8981\u533f\u540d\u51fd\u6570\u7684\u5730\u65b9\u3002<\/p>\n\n\n\n
\/\/\u666e\u901a\u51fd\u6570\nfunction fn(){\n}\n\/\/\u51fd\u6570\u8868\u8fbe\u5f0f\nconst = function (){\n}\n<\/code><\/pre>\n\n\n\n
\/\/\u7bad\u5934\u51fd\u6570\nconst fn = () =>{\n    \n}\n<\/code><\/pre>\n\n\n\n
const jiantou = (x) => {\n    console.log(x)   \n}\njiantou(1)\n<\/code><\/pre>\n\n\n\n
\u53ea\u6709\u4e00\u4e2a\u5f62\u53c2\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u7701\u7565\u5c0f\u62ec\u53f7<\/p>\n\n\n\n
const fn = x = >{\n    console.log(x)   \n}\nfn(1)\n\/\/1\n<\/code><\/pre>\n\n\n\n
\u53ea\u6709\u4e00\u884c\u4ee3\u7801\u7684\u65f6\u5019\u53ef\u4ee5\u7701\u7565\u5927\u62ec\u53f7<\/p>\n\n\n\n
const fn = x => console.log(x)   \nfn(1)\n<\/code><\/pre>\n\n\n\n
\u5728return\u91cc\u9762\u8fd8\u80fd\u7701<\/p>\n\n\n\n
const fn = x = >{\n     return x+x  \n}\nconsole.log(fn(1))\n\/\/\u53ef\u4ee5\u7b80\u5199\u6210\nconst fn = x => x+x\nconsole.log(fn(1))\n<\/code><\/pre>\n\n\n\n
\u5728\u5199\u4e00\u884c\u7684\u65f6\u5019\uff0c\u4e0d\u52a0return\u4e5f\u80fd\u628a\u7ed3\u679c\u7ed9\u51fa\u6765\u3002<\/p>\n\n\n\n
\u6ce8\u610f\u7bad\u5934\u51fd\u6570\u53ef\u4ee5\u76f4\u63a5\u8fd4\u56de\u4e00\u4e2a\u5bf9\u8c61<\/strong><\/p>\n\n\n\n
\/\/\u539f\u5148\u662f\u8fd9\u6837\nconst  fn = (uname) => {\n    return {name:uname}\n}\nfn('\u5f20\u4e09')\n<\/code><\/pre>\n\n\n\n
\u53ef\u4ee5\u6539\u6210\u8fd9\u6837<\/p>\n\n\n\n
const  fn = (uname) => ({uname:uname})\nfn('\u5f20\u4e09')\n<\/code><\/pre>\n\n\n\n
\u8fd9\u91cc\u56e0\u4e3a\u5bf9\u8c61\u7684\u5927\u62ec\u53f7\u548c\u7bad\u5934\u51fd\u6570\u7684\u5927\u62ec\u53f7\u51b2\u7a81\u4e86\uff0c\u6240\u4ee5\u8fd9\u91cc\u62ff\u5c0f\u62ec\u53f7\u5305\u8d77\u6765<\/strong><\/p>\n\n\n\n
\u7bad\u5934\u51fd\u6570\u53c2\u6570<\/h4>\n\n\n\n
\u7bad\u5934\u51fd\u6570\u6ca1\u6709arguments\u4f46\u662f\u6709\u5269\u4f59\u53c2\u6570…<\/p>\n\n\n\n
\u7bad\u5934\u51fd\u6570\u7684this<\/h4>\n\n\n\n
\u7bad\u5934\u51fd\u6570\u7684this\u6307\u5411\u7684\u662f\u4e0a\u4e00\u5c42\u51fd\u6570\u7684\u4f5c\u7528\u57df<\/p>\n\n\n\n
\u6bd4\u5982<\/p>\n\n\n\n
const fn = ()=>{\nconsole.log(this)\n}\nfn()\n\/\/\u6253\u5370\u51fa\u6765\u5c31\u662fwindow\n<\/code><\/pre>\n\n\n\n
\u7bad\u5934\u51fd\u6570\u6ca1\u6709this\uff0c\u4f20\u7edf\u7684\u51fd\u6570\u5199\u6cd5\u6709this<\/p>\n\n\n\n
let obj = {\nname : '\u5f20\u4e09',\nage : 18,\nsex : '\u7537',\nsayhi:function(){\n    console.log(this);\n    let i = 10\n    const count = () => {\n        console.log(this);\n\n        }\n        count()\n}\n}  \nobj.sayhi()  \n<\/code><\/pre>\n\n\n\n
\u5728\u8fd9\u4e2a count\u51fd\u6570\u91cc\u9762\uff0cthis\u56e0\u4e3a\u7bad\u5934\u51fd\u6570\u91cc\u9762\u6ca1\u6709this\u4ed6\u5c31\u53bb\u4e0a\u9762\u627e\uff0c\u521a\u597d\u4e0a\u9762\u662f\u5728\u4f20\u7edf\u7684\u51fd\u6570\u6709this\uff0c\u4f20\u7edf\u7684\u51fd\u6570\u7684this\u6307\u5411\u7684\u662f\u8c03\u7528\u4ed6\u7684\u5730\u65b9\uff0c\u6240\u4ee5this\u5c31\u662fobj<\/p>\n\n\n\n
\u6240\u4ee5\u5728dom\u56de\u8c03\u51fd\u6570\u7684\u65f6\u5019\uff0c\u4e0d\u5efa\u8bae\u7528\u7bad\u5934\u51fd\u6570\uff0cthis\u6307\u5411\u7684\u5c31\u662fwindow\u4e86\u3002<\/strong><\/p>\n\n\n\n
\u89e3\u6784\u8d4b\u503c<\/h2>\n\n\n\n
\u6570\u7ec4\u89e3\u6784\u5c31\u662f\u5c06\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u5feb\u901f\u7684\u8d4b\u503c\u7ed9\u4e00\u7cfb\u5217\u53d8\u91cf\u7684\u7b80\u6d01\u8bed\u6cd5<\/p>\n\n\n\n
const arr = [100,60,80]\n\/\/\u6570\u7ec4\u89e3\u6784 \u8d4b\u503c\nconst [max,min,avg] = arr\nconsole.log(max)\/\/100\n<\/code><\/pre>\n\n\n\n
\u57fa\u672c\u8bed\u6cd5\uff1a\u4ea4\u6362\u4e24\u4e2a\u53d8\u91cf<\/p>\n\n\n\n
let a = 1\nlet b = 1;\n[b,a] = [a,b]\nconsole.log(a,b)\n<\/code><\/pre>\n\n\n\n
\u5728let b =1\u7684\u540e\u9762\u5fc5\u987b\u52a0\u5206\u53f7\uff0c\u4e0d\u7136\u4f1a\u62a5\u9519<\/p>\n\n\n\n
\u4e3a\u4ec0\u4e48\u5fc5\u987b\u52a0\u5206\u53f7\uff1f \u4e24\u79cd\u5fc5\u987b\u52a0\u5206\u53f7\u7684\u5fc5\u987b\u60c5\u51b5<\/p>\n\n\n\n
\u7acb\u5373\u6267\u884c\u51fd\u6570\u8981\u52a0<\/strong><\/p>\n\n\n\n
\u4f7f\u7528\u6570\u7ec4\u7684\u65f6\u5019\u89e3\u6784<\/h4>\n\n\n\n
const arr = 'hello'\n[1,2,3].map(function(item){\nconsole.log(item)\n})\n\/\/\u5728\u8fd9\u91cc\u5c31\u4f1a\u62a5\u9519\n\u6240\u4ee5\u6570\u7ec4\u524d\u9762\u8981\u52a0\u5206\u53f7\u3002\n\nconst arr = 'hello'\n[1,2,3].map(function(item){\nconsole.log(item)\n})\n\/\/\u52a0\u4e86\u5206\u53f7\u540e\u5c31\u4e0d\u4f1a\u62a5\u9519\u4e86\n<\/code><\/pre>\n\n\n\n
\u4f7f\u7528\u5bf9\u8c61\u7684\u65f6\u5019\u89e3\u6784<\/h4>\n\n\n\n
\/\/\u89e3\u6784\u7684\u8bed\u6cd5\nconst {uname,age} = {uname:'\u5f20\u4e09',age:18}\n\/\/\u7b49\u4ef7\u4e8econst uname = obj.uname\nconsole.log(uname);\nconsole.log(age);\n<\/code><\/pre>\n\n\n\n
\u6709\u4e2a\u8981\u6c42\uff0c\u5c31\u662f\u5c5e\u6027\u540d\u548c\u53d8\u91cf\u540d\u5fc5\u987b\u76f8\u540c\u3002<\/strong><\/p>\n\n\n\n
\u5982\u679c\u5bf9\u8c61\u548c\u5c5e\u6027\u4e0d\u4e00\u81f4\u7684\u5316\u5c31\u662fundefined<\/p>\n\n\n\n
\u5bf9\u8c61\u89e3\u6784\u7684\u53d8\u91cf\u540d\uff0c\u53ef\u4ee5\u91cd\u65b0\u6539\u540d<\/p>\n\n\n\n
\u7528\u6cd5 \u65e7\u53d8\u91cf\u540d\uff1a\u65b0\u53d8\u91cf\u540d<\/p>\n\n\n\n
const uname = '\u5c0f\u738b'\nconst {uname\uff1aname,age} = {uname:'\u5f20\u4e09',age:18}\n<\/code><\/pre>\n\n\n\n
\u6570\u7ec4\u5bf9\u8c61\u7684\u89e3\u6784<\/h4>\n\n\n\n
const pig  = [{uname : '\u5f20\u4e09', age: 18}]\n\/\/\u6570\u7ec4\u5bf9\u8c61\u89e3\u6784\nconst [{uname, age}] = pig\nconsole.log(uname, age);\n<\/code><\/pre>\n\n\n\n
\u591a\u7ea7\u5bf9\u8c61\u89e3\u6784<\/h4>\n\n\n\n
\/\/\u591a\u7ea7\u5bf9\u8c61\u89e3\u6784\nconst obj = {\n    name : '\u5f20\u4e09',\n    family:{\n        father:'\u5f20\u56db',\n        mother:'\u5f20\u4e94',\n}\n}\nconst {name,family:{father}} = obj\nconsole.log(name,father);\n<\/code><\/pre>\n\n\n\n
\u904d\u5386\u6570\u7ec4foreach\u65b9\u6cd5<\/h4>\n\n\n\n
\u88ab\u904d\u5386\u7684\u6570\u7ec4.forEach(funtion(\u5f53\u524d\u5143\u7d20\uff0c\u5f53\u524d\u5143\u7d20\u7684\u7d22\u5f15\u53f7){<\/p>\n\n\n\n
\u51fd\u6570\u4f53})<\/p>\n\n\n\n
\u5f53\u524d\u5143\u7d20 \u5fc5\u987b\u5199\uff0c\u7d22\u5f15\u53f7\u53ef\u4ee5\u4e0d\u5fc5\u8981\u5199\u3002<\/p>\n\n\n\n
\u904d\u5386\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20,\u53ea\u904d\u5386\uff0c\u4e0d\u8fd4\u56de\u6570\u7ec4<\/p>\n\n\n\n
\u52a0\u5f3a\u7248\u7684map\u5faa\u73af\uff0cfor\u5faa\u73af<\/p>\n\n\n\n
\u53ea\u80fd\u904d\u5386\u6570\u7ec4\uff0c\u5bf9\u8c61\u4e0d\u53ef\u4ee5<\/p>\n\n\n\n
const arr = [1,2,3,4,5,6,7,8,9,10];\narr.map((item,index)=>{\n    console.log(item,index)\n})\narr.forEach((item,index)=>{\n    console.log(item,index)\n})\n<\/code><\/pre>\n\n\n\n
forEach\u9002\u5408\u904d\u5386\u6570\u7ec4\u5bf9\u8c61\u3002<\/p>\n\n\n\n
\u6df1\u5165\u5bf9\u8c61<\/h2>\n\n\n\n
\u6570\u636e\u7684\u5904\u7406<\/h3>\n\n\n\n
\u6784\u9020\u51fd\u6570<\/p>\n\n\n\n
function people(name,age,sex){\nthis.name = name;\nthis.age = age\nthis.sex = sex\n}\nnew people('xiaozhang','18','female')\nconsole.log(people.name);\n<\/code><\/pre>\n\n\n\n
\u6709\u4e24\u4e2a\u7ea6\u5b9a<\/p>\n\n\n\n
1.\u547d\u540d\u5fc5\u987b\u8981\u5927\u5199\u5b57\u6bcd\u5f00\u5934<\/p>\n\n\n\n
2.\u521b\u5efa\u5bf9\u8c61\uff0c\u5fc5\u987b\u8981\u7528new<\/p>\n\n\n\n
3.\u4f7f\u7528new\u5173\u952e\u5b57\u8c03\u7528\u6784\u9020\u51fd\u6570\u53eb\u505a\u5b9e\u4f8b\u5316<\/p>\n\n\n\n
\u4e0d\u52a0\u53c2\u6570\u53ef\u4ee5\u7701\u7565<\/p>\n\n\n\n
\u6784\u9020\u51fd\u6570\u6ca1\u6709return\uff0c\u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u5bf9\u8c61\u3002<\/p>\n\n\n\n
\u5b9e\u4f8b\u6210\u5458\uff0c\u9759\u6001\u6210\u5458<\/h3>\n\n\n\n
\u5b9e\u4f8b\u6210\u5458\u5305\u542b\u5b9e\u4f8b\u5c5e\u6027\u548c\u5b9e\u4f8b\u65b9\u6cd5<\/p>\n\n\n\n
\u9759\u6001\u6210\u5458\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u88ab\u79f0\u4e3a\u9759\u6001\u5c5e\u6027\u548c\u9759\u6001\u65b9\u6cd5\u3002<\/p>\n\n\n\n
\u9762\u5411\u5bf9\u8c61\u7684\u7279\u6027<\/p>\n\n\n\n
1.\u5c01\u88c5\u6027<\/p>\n\n\n\n
2.\u7ee7\u627f\u6027<\/p>\n\n\n\n
3.\u591a\u6001\u6027<\/p>\n\n\n\n
\u6784\u9020\u51fd\u6570\u7684\u4e00\u4e9b\u95ee\u9898<\/p>\n\n\n\n
function Goods(name,age,sex){\nthis.name = name;\nthis.age = age\nthis.sex = sex\nthis.study  = function(){\n    console.log('\u5b66\u4e60');\n}\n}\nconst xiaozhang =  new Goods('xiaozhang','18','female')\nconst xiaohong = new Goods('xiao\u7ea2','13','male')\nconsole.log(xiaozhang.study === xiaohong.study);\n\/\/result = false\n<\/code><\/pre>\n\n\n\n
\u8868\u9762\u4e0a\u8fd9\u4e24\u4e2asing\u90fd\u662f\u76f8\u540c\u7684\u4e00\u6a21\u4e00\u6837\uff0c\u4f46\u662f\u4e0d\u76f8\u540c\uff0c\u8fd9\u6837\u5730\u5740\u662f\u4e0d\u540c\u7684\uff0c\u4f1a\u51fa\u73b0\u6d6a\u8d39\u5185\u5b58\u7684\u60c5\u51b5\uff0c\u89e3\u51b3\u65b9\u6cd5\u5c31\u662f\u539f\u578b<\/p>\n\n\n\n
\u539f\u578b<\/h3>\n\n\n\n
\u80fd\u591f\u539f\u578b\u5bf9\u8c61\u5b9e\u73b0\u65b9\u6cd5\u5171\u4eab<\/p>\n\n\n\n
js\u89c4\u5b9a\uff0c\u6784\u9020\u51fd\u6570\u91cc\u9762\u6709\u4e00\u4e2a\u5c5e\u6027\uff0c\u53eb\u505aprototype\u5c5e\u6027\uff0c\u4f46\u662f\u4ed6\u5176\u5b9e\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u5c31\u662f\u539f\u578b<\/p>\n\n\n\n
\u6bd4\u5982\u6253\u5370\u4e00\u4e0b<\/p>\n\n\n\n
function Goods(name,age,sex){\nthis.name = name;\nthis.age = age\nthis.sex = sex\nthis.study  = function(){\n    console.log('\u5b66\u4e60');\n}\n}\nconsole.log(Goods.prototype);\n\\\\[[Prototype]]:Object\n<\/code><\/pre>\n\n\n\n
\u73b0\u5728\u53ef\u4ee5\u7528\u8fd9\u79cd\u5199\u6cd5<\/p>\n\n\n\n
function Goods(name,age,sex){\nthis.name = name;\nthis.age = age\nthis.sex = sex\n}\nGoods.prototype.study = function(){\n    console.log('\u6211\u8981\u5b66\u4e60');\n}\/\/\u4fee\u6539\u4e86\u8fd9\u91cc\uff0c\u628athis.study\u6539\u6210\u4e86this.prototype.study\nconst xiaozhang =  new Goods('xiaozhang','18','female')\nconst xiaohong = new Goods('xiao\u7ea2','13','male')\nconsole.log(xiaozhang.study === xiaohong.study);\n\/\/res \u662ftrue\n<\/code><\/pre>\n\n\n\n
\u516c\u5171\u7684\u65b9\u6cd5\u5199\u5728\u539f\u578b\u5bf9\u8c61\u91cc\u9762<\/p>\n\n\n\n
constructor\u5c5e\u6027<\/h3>\n\n\n\n
\u5355\u8bcd\u7684\u610f\u601d\u5c31\u662f\u6784\u9020\u5668\uff0c\u6784\u9020\u51fd\u6570<\/p>\n\n\n\n
constructor\u662f\u5728\u539f\u578b\u5bf9\u8c61\u91cc\u9762\u7684\u3002\u6307\u56de\u4e86\u539f\u6765\u7684\u5bf9\u8c61\u3002<\/p>\n\n\n\n
function Goods(name,age,sex){\nthis.name = name;\nthis.age = age\nthis.sex = sex\n}\nGoods.prototype.study = function(){\n    console.log('\u6211\u8981\u5b66\u4e60');\n}\nconst xiaozhang =  new Goods('xiaozhang','18','female')\nconst xiaohong = new Goods('xiao\u7ea2','13','male')\nconsole.log(Goods.prototype.constructor === Goods);\/\/true\n<\/code><\/pre>\n\n\n\n
\u4f46\u662f\u5047\u8bbe\u6211\u4eec\u8981\u628a\u591a\u4e2a\u81ea\u5b9a\u4e49\u65b9\u6cd5\u653e\u8fdb\u539f\u578b\u91cc\u9762\uff0c\u4f1a\u8986\u76d6\u6389constructor\u7684\u5c5e\u6027\uff0c\u5fc5\u987b\u521b\u5efa\u540e\uff0c\u8fd8\u662f\u8981\u628aconstructor\u91cd\u65b0\u52a0\u4e0a\u53bb\u3002<\/p>\n\n\n\n
Goods.prototype.study = function(){\n    console.log('\u6211\u8981\u5b66\u4e60');\n}\nGoods.prototype.read = function(){\n    console.log('\u6211\u8981\u8bfb\u4e66');\n}\n<\/code><\/pre>\n\n\n\n
\u8fd9\u6837\u5355\u4e2a\u5199\u6bd4\u8f83\u9ebb\u70e6\uff0c\u56e0\u4e3a\u539f\u578b\u672c\u8eab\u4e5f\u662f\u5bf9\u8c61\uff0c\u6211\u628a\u8fd9\u91cc\u4e24\u4e2a\u90fd\u653e\u5fc3\u53bb<\/p>\n\n\n\n
Goods.prototype = {\n    constructor:Goods,\/\/\u8fd9\u91cc\u662f\u5173\u952e\uff0c\u4e00\u5b9a\u8981\u91cd\u65b0\u6307\u56de\u53bb\u5f53\u524d\u7684\u6784\u9020\u51fd\u6570\n    study:function(){\n        console.log('\u6211\u8981\u5b66\u4e60');\n    },\n    read:function(){\n        console.log('\u6211\u8981\u8bfb\u4e66');\n    }\n}\n<\/code><\/pre>\n\n\n\n
\u5bf9\u8c61\u7684 __ proto __<\/h3>\n\n\n\n
\u5bf9\u8c61\u90fd\u4f1a\u6709\u8fd9\u4e2a\u5c5e\u6027__ proto __\u6307\u5411\u6784\u9020\u51fd\u6570\u7684prototype\u7684\u539f\u578b\u5bf9\u8c61\u3002<\/p>\n\n\n\n
__ proto __\u6307\u5411\u7684prototype<\/p>\n\n\n\n
\u6240\u4ee5\u8fd9\u4e24\u4e2a\u76f8\u7b49<\/p>\n\n\n\n
__ proto __\uff08\u5bf9\u8c61\u539f\u578b\uff09=== prototype(\u539f\u578b\u5bf9\u8c61)<\/p>\n\n\n\n
function Person(){\n    this.eys = 2\n    this.leg = 2\n}\nconst ldh = new Person()\nconsole.log(ldh.__proto__ === Person.prototype)\/\/true\n<\/code><\/pre>\n\n\n\n
\u539f\u578b\u7ee7\u627f<\/h3>\n\n\n\n
\u901a\u8fc7\u539f\u578b\u53bb\u7ee7\u627f\u5bf9\u8c61<\/p>\n\n\n\n
function Person(){\n    this.eys = 2\n    this.leg = 2\n}\nfunction Man(){\n    this.name = 'man'\n    this.sex = 'male'\n}\n\/\/\u56e0\u4e3aman\u4e5f\u662f\u4eba\uff0c\u6240\u4ee5\u96c6\u6210person\nMan.prototype = new Person()\nMan.prototype.constructor = Man\n<\/code><\/pre>\n\n\n\n
\u539f\u578b\u94fe<\/h3>\n\n\n\n
\u8fd9\u4e2a\u5c31\u6709\u70b9\u5957\u5a03\u4e86\uff0c\u6700\u5927\u7684\u5c31\u662fObject\uff0cObject\u7684prototype.__ proto __\u6307\u5411\u7684\u5c31\u4e3anull\u3002<\/p>\n\n\n\n
function Person(){\n    this.eys = 2\n    this.leg = 2\n}\nconst ldh = new Person()\nconsole.log(ldh.__proto__ === Person.prototype)\n\/\/Person.prototype\u8fd9\u4e5f\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u4e5f\u6709__proto__\u5c5e\u6027\uff0c\u6307\u5411Object.prototype\nconsole.log(Person.prototype.__proto__ === Object.prototype)\/\/true\n\/\/Object.prototype.__proto__\u6307\u5411null\nconsole.log(Object.prototype.__proto__ === null)\/\/true\n\/\/Object.prototype.__proto__\u6307\u5411null\uff0c\u6240\u4ee5Person.prototype.__proto__\u6307\u5411Object.prototype\n\/\/ldh.__proto__\u6307\u5411Person.prototype\uff0c\u6240\u4ee5ldh.__proto__.__proto__\u6307\u5411Object.prototype\n\/\/ldh.__proto__.__proto__.__proto__\u6307\u5411null\n<\/code><\/pre>\n\n\n\n
\u539f\u578b\u94fe:\u57fa\u4e8e\u539f\u578b\u5bf9\u8c61\u7684\u7ee7\u627f\u4f7f\u5f97\u4e0d\u540c\u6784\u9020\u51fd\u6570\u7684\u539f\u578b\u5bf9\u8c61\u5173\u8054\u5728\u4e00\u8d77\uff0c\u5e76\u4e14\u8fd9\u79cd\u5173\u8054\u7684\u5173\u7cfb\u662f\u4e00\u79cd\u94fe\u72b6\u7684\u89e3\u6784\uff0c\u6211\u4eec\u5c06\u539f\u578b\u5bf9\u8c61\u7684\u94fe\u72b6\u7ed3\u6784\u5173\u7cfb\u79f0\u4e3a\u539f\u578b\u94fe<\/p>\n\n\n\n
\u539f\u578b\u94fe\u5176\u5b9e\u5c31\u662f\u4e00\u4e2a\u67e5\u627e\u89c4\u5219\uff0c\u5148\u770b\u5f53\u524d\u7684\u539f\u578b\u5bf9\u8c61\u4e0a\u67e5\u627e\u770b\u6709\u6ca1\u6709\uff0c\u5982\u679c\u6ca1\u6709\u5c31\u53bb\u4e0a\u4e00\u5c42\u7684\u539f\u578b\u5bf9\u8c61\u4e0a\u67e5\u627e\u770b\u6709\u6ca1\u6709\uff0c\u8fd9\u5c31\u5f62\u6210\u4e86\u4e00\u4e2a\u94fe\u3002<\/p>\n\n\n\n
\u8fd0\u7b97\u7b26instanceof<\/h3>\n\n\n\n
\u770b\u4e00\u4e2a\u5bf9\u8c61\u662f\u4e0d\u662f\u5728\u539f\u578b\u94fe\u4e0a<\/p>\n\n\n\n
function Person(){\n    this.eys = 2\n    this.leg = 2\n}\nconst ldh = new Person()\nconsole.log(ldh instanceof Person);\/\/ true\nconsole.log(ldh instanceof Object);\/\/true\n<\/code><\/pre>\n\n\n\n
\u6848\u4f8b \u6a21\u6001\u6846\u6784\u9020\u51fd\u6570\u7684\u5199\u6cd5<\/h3>\n\n\n\n
<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n    <meta charset=\"UTF-8\">\n    <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n    <title>Document<\/title>\n    <style>\n        #delete{\n            width: 100px;\n            height: 50px;\n            background-color: pink;\n            color: white;\n            border: none;\n            border-radius: 5px;\n        }\n        #login{\n            width: 100px;\n            height: 50px;\n            background-color: pink;\n            color: white;\n            border: none;\n            border-radius: 5px;\n        }\n        .model {\n            width: 300px;\n            height: 100px;\n            background-color: white;\n            margin-top: 10px;\n            display: block;\n            position: absolute;\n            top: 50%;\n            left: 50%;\n            transform: translate(-50%, -50%);\n            border: 1px solid black;\n        }\n        .header {\n            width: 100%;\n            height: 30px;\n            background-color: pink;\n            text-align: center;\n            line-height: 30px;\n        }\n        .body {\n            width: 100%;\n            height: 70px;\n            text-align: center;\n            line-height: 70px;\n        }\n        .i {\n            position: absolute;\n            top: 0;\n            right: 0;\n            width: 30px;\n            height: 30px;\n            background-color: white;\n            text-align: center;\n            line-height: 30px;\n        }\n    <\/style>\n<\/head>\n<body>\n    <button id=\"delete\">\u5220\u9664<\/button>\n    <button id=\"login\">\u6ce8\u518c<\/button>\n    \n<\/body>\n<script>\nfunction model(title='',content=''){ \n    this.modelBox = document.createElement('div');\n    this.modelBox.className = 'model';\n    this.modelBox.innerHTML = `\n            <div class=\"header\">\n            ${title}\n            <a class=\"i\" href=\"javascript:;\">\u00d7<\/a>\n        <\/div>\n        <div class=\"body\">\n        ${content}\n        <\/div>\n    `\n    console.log(this.modelBox);   \n}\nmodel.prototype.open = function(){\n    \/\/\u8fd9\u4e2a\u51fd\u6570\u9700\u8981\u7528this\uff0c\u6240\u4ee5\u4e0d\u7528\u7bad\u5934\u51fd\u6570\n    document.body.append(this.modelBox);\n    this.modelBox.querySelector('.i').addEventListener('click',()=>{\n        this.close();\n    \n})}\nmodel.prototype.close = function(){\n    this.modelBox.remove();\n}\n\/\/ new model('\u6e29\u99a8\u63d0\u793a','\u4f60\u6ca1\u6709\u5220\u9664\u6743\u9650');\n\/\/ new model('\u53cb\u60c5\u63d0\u793a','\u4f60\u6ca1\u6709\u767b\u5f55');\ndocument.querySelector('#delete').addEventListener('click',function(){\nconst  del = new model('\u6e29\u99a8\u63d0\u793a','\u4f60\u6ca1\u6709\u5220\u9664\u6743\u9650')\n    del.open()\n})\ndocument.querySelector('#login').addEventListener('click',function(){\nconst   login = new model('\u53cb\u60c5\u63d0\u793a','\u4f60\u6ca1\u6709\u6ce8\u518c\u7684')\n    login.open()\n})\n<\/script>\n<\/html>\n<\/code><\/pre>\n\n\n\n
\u6df1\u5165\u5b66\u4e60this & js\u5f02\u5e38\u5904\u7406<\/h2>\n\n\n\n
\u6df1\u6d45\u62f7\u8d1d\u7684\u95ee\u9898<\/h3>\n\n\n\n
\u5f00\u53d1\u7684\u8fc7\u7a0b\u4e2d\u7ecf\u5e38\u9700\u8981\u590d\u5236\u4e00\u4e2a\u5bf9\u8c61\u3002\u5982\u679c\u76f4\u63a5\u8d4b\u503c\u4f1a\u51fa\u73b0\u4e0b\u9762\u95ee\u9898<\/p>\n\n\n\n
const pink = {\n    name :'pink',\n    age : 18\n}\nconst red = pink \nred.name = 'red'\nconsole.log(pink.name)\/\/red\nconsole.log(red.name)\/\/red\n<\/code><\/pre>\n\n\n\n
\u8fd9\u5c31\u51fa\u73b0\u4e86\u6df1\u62f7\u8d1d\u7684\u95ee\u9898\uff0c\u628apink\u4e5f\u6539\u4e86<\/p>\n\n\n\n
\u9996\u5148\u6df1\u6d45\u62f7\u8d1d\u9488\u5bf9\u5f15\u7528\u7c7b\u578b<\/p>\n\n\n\n
\u6d45\u62f7\u8d1d:\u62f7\u7684\u662f\u5730\u5740<\/p>\n\n\n\n
\u6df1\u62f7\u8d1d\uff1a\u62f7\u7684\u662f\u5f15\u7528<\/p>\n\n\n\n
\u6d45\u62f7\u8d1d<\/p>\n\n\n\n
1.<\/p>\n\n\n\n
PC\u7aef\u7f51\u9875\u7279\u6548<\/h1>\n\n\n\n
\u5143\u7d20\u504f\u79fb\u91cfoffset<\/h2>\n\n\n\n
\u504f\u79fb\u91cf\uff0c\u53ef\u4ee5\u76f8\u5bf9\u5e94\u7684\u52a8\u6001\u7684\u5f97\u5230\u5143\u7d20\u7684\u4f4d\u7f6e\u91d1\u989d\u504f\u79fb\u91cf<\/p>\n\n\n\n
\u83b7\u53d6\u5143\u7d20\u8ddd\u79bb\u7684\u5b9a\u4f4d\u7236\u5143\u7d20\u7684\u4f4d\u7f6e<\/p>\n\n\n\n
\u83b7\u53d6\u5143\u7d20\u81ea\u8eab\u7684\u5927\u5c0f<\/p>\n\n\n\n
\u8fd4\u56de\u7684\u6570\u503c\u90fd\u4e0d\u5e26\u5355\u4f4d<\/strong><\/p>\n\n\n\n
\n<body>\n    <div class=\"father\">\n      ```  <div class=\"son\"><\/div>\n    <\/div>\n    <div class=\"w\"><\/div>\n    <script>\n        \/\/ offset \u7cfb\u5217\n        var father = document.querySelector('.father');\n        var son = document.querySelector('.son');\n        \/\/ 1.\u53ef\u4ee5\u5f97\u5230\u5143\u7d20\u7684\u504f\u79fb \u4f4d\u7f6e \u8fd4\u56de\u7684\u4e0d\u5e26\u5355\u4f4d\u7684\u6570\u503c  \n        console.log(father.offsetTop);\n        console.log(father.offsetLeft);\n        \/\/ \u5b83\u4ee5\u5e26\u6709\u5b9a\u4f4d\u7684\u7236\u4eb2\u4e3a\u51c6  \u5982\u679c\u4e48\u6709\u7236\u4eb2\u6216\u8005\u7236\u4eb2\u6ca1\u6709\u5b9a\u4f4d \u5219\u4ee5 body \u4e3a\u51c6\n        console.log(son.offsetLeft);\n        var w = document.querySelector('.w');\n        \/\/ 2.\u53ef\u4ee5\u5f97\u5230\u5143\u7d20\u7684\u5927\u5c0f \u5bbd\u5ea6\u548c\u9ad8\u5ea6 \u662f\u5305\u542bpadding + border + width \n        console.log(w.offsetWidth);\n        console.log(w.offsetHeight);\n        \/\/ 3. \u8fd4\u56de\u5e26\u6709\u5b9a\u4f4d\u7684\u7236\u4eb2 \u5426\u5219\u8fd4\u56de\u7684\u662fbody\n        console.log(son.offsetParent); \/\/ \u8fd4\u56de\u5e26\u6709\u5b9a\u4f4d\u7684\u7236\u4eb2 \u5426\u5219\u8fd4\u56de\u7684\u662fbody\n        console.log(son.parentNode); \/\/ \u8fd4\u56de\u7236\u4eb2 \u662f\u6700\u8fd1\u4e00\u7ea7\u7684\u7236\u4eb2 \u4eb2\u7238\u7238 \u4e0d\u7ba1\u7236\u4eb2\u6709\u6ca1\u6709\u5b9a\u4f4d\n    <\/script>\n<\/body>\n<\/code><\/pre>\n\n\n\n
\u62d6\u52a8\u6a21\u6001\u6846<\/h2>\n\n\n\n
<!DOCTYPE html>\n<html>\n\n<head lang=\"en\">\n    <meta charset=\"UTF-8\">\n    <title><\/title>\n    <style>\n        .login-header {\n            width: 100%;\n            text-align: center;\n            height: 30px;\n            font-size: 24px;\n            line-height: 30px;\n        }\n        \n        ul,\n        li,\n        ol,\n        dl,\n        dt,\n        dd,\n        div,\n        p,\n        span,\n        h1,\n        h2,\n        h3,\n        h4,\n        h5,\n        h6,\n        a {\n            padding: 0px;\n            margin: 0px;\n        }\n        \n        .login {\n            display: none;\n            width: 512px;\n            height: 280px;\n            position: fixed;\n            border: #ebebeb solid 1px;\n            left: 50%;\n            top: 50%;\n            background: #ffffff;\n            box-shadow: 0px 0px 20px #ddd;\n            z-index: 9999;\n            transform: translate(-50%, -50%);\n        }\n        \n        .login-title {\n            width: 100%;\n            margin: 10px 0px 0px 0px;\n            text-align: center;\n            line-height: 40px;\n            height: 40px;\n            font-size: 18px;\n            position: relative;\n            cursor: move;\n        }\n        \n        .login-input-content {\n            margin-top: 20px;\n        }\n        \n        .login-button {\n            width: 50%;\n            margin: 30px auto 0px auto;\n            line-height: 40px;\n            font-size: 14px;\n            border: #ebebeb 1px solid;\n            text-align: center;\n        }\n        \n        .login-bg {\n            display: none;\n            width: 100%;\n            height: 100%;\n            position: fixed;\n            top: 0px;\n            left: 0px;\n            background: rgba(0, 0, 0, .3);\n        }\n        \n        a {\n            text-decoration: none;\n            color: #000000;\n        }\n        \n        .login-button a {\n            display: block;\n        }\n        \n        .login-input input.list-input {\n            float: left;\n            line-height: 35px;\n            height: 35px;\n            width: 350px;\n            border: #ebebeb 1px solid;\n            text-indent: 5px;\n        }\n        \n        .login-input {\n            overflow: hidden;\n            margin: 0px 0px 20px 0px;\n        }\n        \n        .login-input label {\n            float: left;\n            width: 90px;\n            padding-right: 10px;\n            text-align: right;\n            line-height: 35px;\n            height: 35px;\n            font-size: 14px;\n        }\n        \n        .login-title span {\n            position: absolute;\n            font-size: 12px;\n            right: -20px;\n            top: -30px;\n            background: #ffffff;\n            border: #ebebeb solid 1px;\n            width: 40px;\n            height: 40px;\n            border-radius: 20px;\n        }\n    <\/style>\n<\/head>\n\n<body>\n    <div class=\"login-header\"><a id=\"link\" href=\"javascript:;\">\u70b9\u51fb\uff0c\u5f39\u51fa\u767b\u5f55\u6846<\/a><\/div>\n    <div id=\"login\" class=\"login\">\n        <div id=\"title\" class=\"login-title\">\u767b\u5f55\u4f1a\u5458\n            <span><a id=\"closeBtn\" href=\"javascript:void(0);\" class=\"close-login\">\u5173\u95ed<\/a><\/span>\n        <\/div>\n        <div class=\"login-input-content\">\n            <div class=\"login-input\">\n                <label>\u7528\u6237\u540d\uff1a<\/label>\n                <input type=\"text\" placeholder=\"\u8bf7\u8f93\u5165\u7528\u6237\u540d\" name=\"info[username]\" id=\"username\" class=\"list-input\">\n            <\/div>\n            <div class=\"login-input\">\n                <label>\u767b\u5f55\u5bc6\u7801\uff1a<\/label>\n                <input type=\"password\" placeholder=\"\u8bf7\u8f93\u5165\u767b\u5f55\u5bc6\u7801\" name=\"info[password]\" id=\"password\" class=\"list-input\">\n            <\/div>\n        <\/div>\n        <div id=\"loginBtn\" class=\"login-button\"><a href=\"javascript:void(0);\" id=\"login-button-submit\">\u767b\u5f55\u4f1a\u5458<\/a><\/div>\n    <\/div>\n    <!-- \u906e\u76d6\u5c42 -->\n    <div id=\"bg\" class=\"login-bg\"><\/div>\n    <script>\n        \/\/ 1. \u83b7\u53d6\u5143\u7d20\n        var login = document.querySelector('.login');\n        var mask = document.querySelector('.login-bg');\n        var link = document.querySelector('#link');\n        var closeBtn = document.querySelector('#closeBtn');\n        var title = document.querySelector('#title');\n        \/\/ 2. \u70b9\u51fb\u5f39\u51fa\u5c42\u8fd9\u4e2a\u94fe\u63a5 link  \u8ba9mask \u548clogin \u663e\u793a\u51fa\u6765\n        link.addEventListener('click', function() {\n                mask.style.display = 'block';\n                login.style.display = 'block';\n            })\n            \/\/ 3. \u70b9\u51fb closeBtn \u5c31\u9690\u85cf mask \u548c login \n        closeBtn.addEventListener('click', function() {\n                mask.style.display = 'none';\n                login.style.display = 'none';\n            })\n            \/\/ 4. \u5f00\u59cb\u62d6\u62fd\n            \/\/ (1) \u5f53\u6211\u4eec\u9f20\u6807\u6309\u4e0b\uff0c \u5c31\u83b7\u5f97\u9f20\u6807\u5728\u76d2\u5b50\u5185\u7684\u5750\u6807\n        title.addEventListener('mousedown', function(e) {\n            var x = e.pageX - login.offsetLeft;\n            var y = e.pageY - login.offsetTop;\n            \/\/ (2) \u9f20\u6807\u79fb\u52a8\u7684\u65f6\u5019\uff0c\u628a\u9f20\u6807\u5728\u9875\u9762\u4e2d\u7684\u5750\u6807\uff0c\u51cf\u53bb \u9f20\u6807\u5728\u76d2\u5b50\u5185\u7684\u5750\u6807\u5c31\u662f\u6a21\u6001\u6846\u7684left\u548ctop\u503c\n            document.addEventListener('mousemove', move)\n\n            function move(e) {\n                login.style.left = e.pageX - x + 'px';\n                login.style.top = e.pageY - y + 'px';\n            }\n            \/\/ (3) \u9f20\u6807\u5f39\u8d77\uff0c\u5c31\u8ba9\u9f20\u6807\u79fb\u52a8\u4e8b\u4ef6\u79fb\u9664\n            document.addEventListener('mouseup', function() {\n                document.removeEventListener('mousemove', move);\n            })\n        })\n    <\/script>\n<\/body>\n\n<\/html>\n<\/code><\/pre>\n\n\n\n
\u6a21\u4eff\u4eac\u4e1c\u653e\u5927\u955c<\/h3>\n\n\n\n
\uff08\u6253\u778c\u7761\u53bb\u4e86\uff09\u8fd9\u91cc\u6709\u70b9\u590d\u6742\uff0c\u5c31\u6ca1\u5199\u4e86\uff0c\u770bppt<\/p>\n\n\n\n
\u5143\u7d20\u53ef\u89c6\u533aclient\u7cfb\u5217<\/h2>\n\n\n\n
\u548coffset\u7684\u5dee\u4e0d\u591a\uff0c\u4f46\u662f\u8fd4\u56de\u7684\u662f\u4e0d\u5305\u542b\u8fb9\u6846\u7684\u3002<\/p>\n\n\n\n
\u4f46\u662f\u4f1a\u5305\u542bpadding\u7684\u4f4d\u7f6e\u3002<\/p>\n\n\n\n
\u7acb\u5373\u6267\u884c\u51fd\u6570<\/h2>\n\n\n\n
\u4e0d\u9700\u8981\u8c03\u7528\uff0c\u7acb\u9a6c\u5c31\u80fd\u6267\u884c\u3002<\/p>\n\n\n\n
\u5199\u6cd5\uff0c\u8fd9\u4e24\u79cd<\/p>\n\n\n\n
(function(){})()\n(function(){}())\n<\/code><\/pre>\n\n\n\n
<script>\n(function(){\n    console.log(1); \n})();\n\n\/\/\u7b2c\u4e8c\u79cd\n(function(){\n    console.log(2);\n}());\n<\/code><\/pre>\n\n\n\n
(function(\u8fd9\u91cc \u5199\u5f62\u53c2){}(\u8fd9\u91cc\u5199\u4f20\u9012\u7684\u5b9e\u53c2))\n<\/code><\/pre>\n\n\n\n
\u7acb\u5373\u6267\u884c\u51fd\u6570\u7684\u597d\u5904\uff0c\u72ec\u7acb\u521b\u5efa\u4e86\u4e2a\u4f5c\u7528\u57df\uff0c\u6240\u6709\u7684\u53d8\u91cf\u90fd\u662f\u5c40\u90e8\u53d8\u91cf\uff0c\u4e0d\u4f1a\u6709\u540d\u5b57\u51b2\u7a81\u3002<\/p>\n\n\n\n
\u7ed9\u6570\u7ec4\u65b0\u5efa\u4e00\u4e2a\u539f\u578b\uff0c\u6765\u6c42\u6570\u7ec4\u7684\u548c\u3002<\/p>\n\n\n\n
const arr = [1,2,6]\nArray.prototype.sum = function(){\n    return this.reduce((pre,cur)=>pre+cur,0)\n}\nconsole.log(arr.sum());\n<\/code><\/pre>\n\n\n\n
###<\/p>\n","protected":false},"excerpt":{"rendered":"
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