{"id":1703,"date":"2011-06-21T13:34:22","date_gmt":"2011-06-21T05:34:22","guid":{"rendered":"http:\/\/www.zhangxinxu.com\/wordpress\/?p=1703"},"modified":"2018-01-02T00:05:14","modified_gmt":"2018-01-01T16:05:14","slug":"javascript%e6%9c%89%e5%85%b3%e7%9a%8410%e4%b8%aa%e6%80%aa%e7%99%96%e5%92%8c%e7%a7%98%e5%af%86","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2011\/06\/javascript%e6%9c%89%e5%85%b3%e7%9a%8410%e4%b8%aa%e6%80%aa%e7%99%96%e5%92%8c%e7%a7%98%e5%af%86\/","title":{"rendered":"\u7ffb\u7f16-JavaScript\u6709\u5173\u768410\u4e2a\u602a\u7656\u548c\u79d8\u5bc6"},"content":{"rendered":"

by zhangxinxu<\/a> from http:\/\/www.zhangxinxu.com<\/a>
\n\u672c\u6587\u5730\u5740\uff1ahttp:\/\/www.zhangxinxu.com\/wordpress\/?p=1703<\/a><\/p>\n

\u6807\u9898\u4e2d\u7684\u201c\u7ffb\u7f16\u201d\u5b9e\u9645\u4e0a\u662f\u201c\u7ffb\u8bd1\u7f16\u8f91\u201d\u7684\u7b80\u79f0\uff0c\u672c\u6587\u5185\u5bb9\u5e76\u4e0d\u662f\u9010\u8bcd\u9010\u53e5\u7684\u7ffb\u8bd1\uff0c\u6838\u5fc3\u610f\u601d\uff0c\u5927\u4f53\u5185\u5bb9\u4e00\u81f4\uff0c\u53e6\u5916\u81ea\u5df1\u6dfb\u52a0\u4e86\u5f88\u8be6\u7ec6\u7684demo\u9875\u9762\u548c\u622a\u56fe\uff0c\u4ee5\u53ca\u4fee\u6b63\u4e86\u539f\u6587\u4e2d\u7684\u4e00\u4e9b\u4ee3\u7801\u5c55\u793a\u4e0a\u7684\u9519\u8bef\u3002<\/p>\n

\n\u539f\u6587\u4f5c\u8005\uff1aAndy Croxall<\/a>
\n\u539f\u6587\u94fe\u63a5\uff1aTen Oddities And Secrets About JavaScript<\/a>
\n\u7ffb\u8bd1\u7f16\u8f91\uff1a\u5f20\u946b\u65ed<\/a>\n<\/div>\n

\/\/zxx:\u8fd9\u91cc\u7701\u6389200\u591a\u5b57\u7684\u5520\u53e8\u2026\u2026\u76f4\u63a5\u770b\u7ffb\u8bd1\u7f16\u8f91\u5185\u5bb9<\/span><\/p>\n

\u6570\u636e\u7c7b\u578b\u548c\u5b9a\u4e49<\/h3>\n

1. Null\u662f\u4e2a\u5bf9\u8c61<\/h3>\n

JavaScript\u4f17\u591a\u7c7b\u578b\u4e2d\u6709\u4e2aNull\u7c7b\u578b\uff0c\u5b83\u6709\u4e2a\u552f\u4e00\u7684\u503cnull, \u5373\u5b83\u7684\u5b57\u9762\u91cf\uff0c\u5b9a\u4e49\u4e3a\u5b8c\u5168\u6ca1\u6709\u4efb\u4f55\u610f\u4e49\u7684\u503c\u3002\u5176\u8868\u73b0\u5f97\u50cf\u4e2a\u5bf9\u8c61\uff0c\u5982\u4e0b\u68c0\u6d4b\u4ee3\u7801\uff1a<\/p>\n

\n
alert(typeof null); \/\/\u5f39\u51fa 'object'<\/span><\/pre>\n<\/div>\n
\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1anull\u4e3a\u5bf9\u8c61\u6d4b\u8bd5demo<\/a><\/p>\n
\u5982\u4e0b\u622a\u56fe\uff1a<\/p>\n

\n\u5c3d\u7ba1typeof<\/code>\u503c\u663e\u793a\u662f\"object\"<\/code>\uff0c\u4f46null<\/code>\u5e76\u4e0d\u8ba4\u4e3a\u662f\u4e00\u4e2a\u5bf9\u8c61\u5b9e\u4f8b\u3002\u8981\u77e5\u9053\uff0cJavaScript\u4e2d\u7684\u503c\u90fd\u662f\u5bf9\u8c61\u5b9e\u4f8b\uff0c\u6bcf\u4e2a\u6570\u503c\u90fd\u662fNumber<\/code>\u5bf9\u8c61\uff0c\u6bcf\u4e2a\u5bf9\u8c61\u90fd\u662fObject<\/code>\u5bf9\u8c61\u3002\u56e0\u4e3anull\u662f\u6ca1\u6709\u503c\u7684\uff0c\u6240\u4ee5\uff0c\u5f88\u660e\u663e\uff0cnull\u4e0d\u662f\u4efb\u4f55\u4e1c\u897f\u7684\u5b9e\u4f8b\u3002\u56e0\u6b64\uff0c\u4e0b\u9762\u7684\u503c\u7b49\u4e8efalse<\/code>\u3002<\/p>\n
\n
alert(null instanceof Object); \/\/\u4e3a false<\/span><\/pre>\n<\/div>\n
\u8bd1\u8005\u6ce8\uff1anull\u8fd8\u6709\u88ab\u7406\u89e3\u4e3a\u5bf9\u8c61\u5360\u4f4d\u7b26\u4e00\u8bf4<\/p>\n
2. NaN\u662f\u4e2a\u6570\u503c<\/h3>\n
NaN\u672c\u610f\u662f\u8868\u793a\u67d0\u4e2a\u503c\u4e0d\u662f\u6570\u503c\uff0c\u4f46\u662f\u5176\u672c\u8eab\u5374\u53c8\u662f\u6570\u503c\uff0c\u4e14\u4e0d\u7b49\u4e8e\u5176\u81ea\u8eab\uff0c\u5f88\u5947\u602a\u5427\uff0c\u770b\u4e0b\u9762\u7684\u4ee3\u7801\uff1a<\/p>\n
\n
alert(typeof NaN); \/\/\u5f39\u51fa 'Number'<\/span>\nalert(NaN === NaN); \/\/\u4e3a false<\/span><\/pre>\n<\/div>\n
\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1aNaN\u662f\u4e2a\u6570\u503c\u6d4b\u8bd5demo<\/a><\/p>\n
\u7ed3\u679c\u5982\u4e0b\u622a\u56fe\uff1a
<\/p>\n
\u5b9e\u9645\u4e0aNaN<\/code>\u4e0d\u7b49\u4e8e\u4efb\u4f55\u4e1c\u897f\u3002\u8981\u786e\u8ba4\u67d0\u73a9\u610f\u662f\u4e0d\u662fNaN<\/code>\u53ea\u80fd\u4f7f\u7528isNaN<\/code>.<\/p>\n
3. \u65e0\u5173\u952e\u5b57\u7684\u6570\u7ec4\u7b49\u540c\u4e8efalse(\u5173\u4e8eTruthy\u548cFalsy)<\/h3>\n
\u4e0b\u9762\u662fJavaScript\u53e6\u4e00\u4e2a\u6781\u54c1\u602a\u7656\uff1a<\/p>\n
\n
alert(new Array() == false); \/\/\u4e3a true<\/span><\/pre>\n<\/div>\n
\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a\u65e0\u5173\u952e\u5b57\u6570\u7ec4\u7b49\u540cflase\u6d4b\u8bd5demo<\/a><\/p>\n
\u7ed3\u679c\u5982\u4e0b\u622a\u56fe\uff1a
<\/p>\n
\u60f3\u8981\u77e5\u9053\u8fd9\u91cc\u53d1\u751f\u4e86\u4ec0\u4e48\uff0c\u4f60\u9700\u8981\u7406\u89e3truthy<\/code>\u548cfalsy<\/code>\u8fd9\u4e2a\u6982\u5ff5\u3002\u5b83\u4eec\u662f\u4e00\u79cdtrue\/flase<\/code>\u5b57\u9762\u91cf\u3002\u5728JavaScript\u4e2d\uff0c\u6240\u6709\u7684\u975eBoolean<\/code>\u578b\u503c\u90fd\u4f1a\u5185\u7f6e\u4e00\u4e2aboolean\u6807\u5fd7\uff0c\u5f53\u8fd9\u4e2a\u503c\u88ab\u8981\u6c42\u6709boolean\u884c\u4e3a\u7684\u65f6\u5019\uff0c\u8fd9\u4e2a\u5185\u7f6e\u5e03\u5c14\u503c\u5c31\u4f1a\u51fa\u73b0\uff0c\u4f8b\u5982\u5f53\u4f60\u8981\u8ddfBoolean<\/code>\u578b\u503c\u6bd4\u5bf9\u7684\u65f6\u5019\u3002<\/p>\n
\u56e0\u4e3a\u82f9\u679c\u4e0d\u80fd\u548c\u68a8\u505a\u6bd4\u8f83\uff0c\u6240\u4ee5\u5f53JavaScript\u4e24\u4e2a\u4e0d\u540c\u7c7b\u578b\u7684\u503c\u8981\u6c42\u505a\u6bd4\u8f83\u7684\u65f6\u5019\uff0c\u5b83\u9996\u5148\u4f1a\u5c06\u5176\u5f31\u5316\u6210\u76f8\u540c\u7684\u7c7b\u578b\u3002false<\/code>, undefined<\/code>, null<\/code>, 0<\/code>, \"\"<\/code>, NaN<\/code>\u90fd\u5f31\u5316\u6210false<\/code>\u3002\u8fd9\u79cd\u5f3a\u5236\u8f6c\u5316\u5e76\u4e0d\u662f\u4e00\u76f4\u5b58\u5728\u7684\uff0c\u53ea\u6709\u5f53\u4f5c\u4e3a\u8868\u8fbe\u5f0f\u4f7f\u7528\u7684\u65f6\u5019\u3002\u770b\u4e0b\u9762\u8fd9\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\uff1a<\/p>\n
\n
var someVar = 0;\nalert(someVar == false); \/\/\u663e\u793a true<\/span><\/pre>\n<\/div>\n
\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a\u6570\u503c0\u548cfalse\u6d4b\u8bd5demo<\/a><\/p>\n
\u7ed3\u679c\u5982\u4e0b\u622a\u56fe\uff1a
<\/p>\n
\u4e0a\u9762\u6d4b\u8bd5\u4e2d\uff0c\u6211\u4eec\u8bd5\u56fe\u5c06\u6570\u503c0\u548cboolean\u503cfalse\u505a\u6bd4\u8f83\uff0c\u56e0\u4e24\u8005\u7684\u6570\u636e\u7c7b\u578b\u4e0d\u517c\u5bb9\uff0cJavaScript\u81ea\u52a8\u5f3a\u5236\u8f6c\u6362\u6210\u7edf\u4e00\u7684\u7b49\u540c\u7684truthy<\/code>\u548cfalsy<\/code>\uff0c\u5176\u4e2d0<\/code>\u7b49\u540c\u4e8efalse<\/code>\uff08\u6b63\u5982\u4e0a\u9762\u6240\u63d0\u53ca\u7684\uff09\u3002<\/p>\n
\u4f60\u53ef\u80fd\u6ce8\u610f\u5230\u4e86\uff0c\u4e0a\u9762\u4e00\u4e9b\u7b49\u540cfalse<\/code>\u7684\u503c\u4e2d\u5e76\u6ca1\u6709\u7a7a\u6570\u7ec4\u3002\u53ea\u56e0\u7a7a\u6570\u7ec4\u662f\u4e2a\u602a\u80da\u5b50\uff1a\u5176\u672c\u8eab\u5b9e\u9645\u4e0a\u5c5e\u4e8etruthy<\/code>\uff0c\u4f46\u662f\u5f53\u7a7a\u6570\u7ec4\u4e0eBoolean<\/code>\u578b\u505a\u6bd4\u8f83\u7684\u65f6\u5019\uff0c\u5176\u884c\u4e3a\u8868\u73b0\u53c8\u5c5e\u4e8efalsy<\/code>\u3002\u4e0d\u89e3\uff1f\u8fd9\u662f\u7531\u539f\u56e0\u7684\u3002\u5148\u4e3e\u4e2a\u4f8b\u5b50\u9a8c\u8bc1\u4e0b\u7a7a\u6570\u7ec4\u7684\u5947\u602a\u813e\u6c14\uff1a<\/p>\n
\n
var someVar = []; \/\/\u7a7a\u6570\u7ec4<\/span>\nalert(someVar == false); \/\/\u7ed3\u679c true<\/span>\nif (someVar) alert('hello'); \/\/alert\u8bed\u53e5\u6267\u884c, \u6240\u4ee5someVar\u5f53\u4f5ctrue<\/span><\/pre>\n<\/div>\n
\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a\u7a7a\u6570\u7ec4\u7684true\/false\u6d4b\u8bd5demo<\/a><\/p>\n
\u7ed3\u679c\u5982\u4e0b\u622a\u56fe\uff0c\u8fde\u7eed\u5f39\u51fa\u4e24\u4e2a\u6846\u6846\uff1a
<\/p>\n
\u8bd1\u8005\u6ce8\uff1a\u4e4b\u6240\u4ee5\u4f1a\u6709\u8fd9\u79cd\u5dee\u5f02\uff0c\u6839\u636e\u4f5c\u8005\u7684\u8bf4\u6cd5\uff0c\u6570\u7ec4\u5185\u7f6etoString()\u65b9\u6cd5\uff0c\u4f8b\u5982\u76f4\u63a5alert\u7684\u65f6\u5019\uff0c\u4f1a\u4ee5join(“,”)\u7684\u5f62\u5f0f\u5f39\u51fa\u5b57\u7b26\u4e32\uff0c\u7a7a\u6570\u7ec4\u81ea\u7136\u5c31\u662f\u7a7a\u5b57\u7b26\u4e32\uff0c\u4e8e\u662f\u7b49\u540cfalse\u3002\u5177\u4f53\u53ef\u53c2\u89c1\u4f5c\u8005\u53e6\u5916\u4e00\u7bc7\u6587\u7ae0\uff0cTwisted logic: understanding truthy & falsy<\/a>\u3002\u4e0d\u8fc7\u6211\u4e2a\u4eba\u5947\u602a\u7684\u662f\uff0c\u50cf\u7a7a\u5bf9\u8c61\uff0c\u7a7a\u51fd\u6570\uff0c\u5f31\u7b49\u4e8etrue\u6216\u8005false\u7684\u65f6\u5019\u90fd\u663e\u793afalse\uff0c\u4e3a\u4f55\uff1f\u771f\u7684\u56e0\u4e3a\u6570\u7ec4\u662f\u4e2a\u602a\u80ce\uff0c\u9700\u8981\u7279\u6b8a\u8003\u8651\u5417\uff1f<\/p>\n
\u4e3a\u907f\u514d\u5f3a\u5236\u8f6c\u6362\u5728\u6bd4\u8f83\u65b9\u9762\u7684\u95ee\u9898\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528\u5f3a\u7b49\u4e8e(===<\/code>)\u4ee3\u66ff\u5f31\u7b49\u4e8e(==<\/code>)\u3002<\/p>\n
\n
var someVar = 0;\nalert(someVar == false); \/\/\u7ed3\u679c true \u2013 0\u5c5e\u4e8efalsy\nalert(someVar === false); \/\/\u7ed3\u679c false \u2013 zero\u662f\u4e2a\u6570\u503c, \u4e0d\u662f\u5e03\u5c14\u503c<\/pre>\n<\/div>\n
\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a\u5f3a\u7b49\u4e8e\u548c\u5f31\u7b49\u4e8e\u6d4b\u8bd5demo<\/a><\/p>\n
\u7ed3\u679c\u5982\u4e0b\u622a\u56fe(win7 FF4)\uff1a
<\/p>\n
\u5982\u679c\u4f60\u60f3\u6df1\u5165\u63a2\u7a76JavaScript\u4e2d\u7c7b\u578b\u5f3a\u5236\u8f6c\u6362\u7b49\u4e9b\u7279\u6709\u7684\u7656\u597d\uff0c\u53ef\u4ee5\u53c2\u89c1\u5b98\u65b9\u76f8\u5173\u7684\u6587\u6863\u89c4\u8303\uff1asection 11.9.3 of the ECMA-262<\/a><\/p>\n
\u6b63\u5219\u8868\u8fbe\u5f0f<\/h3>\n
4. replace()\u53ef\u4ee5\u63a5\u53d7\u56de\u8c03\u51fd\u6570<\/h3>\n
\u8fd9\u662fJavaScript\u6700\u9c9c\u4e3a\u4eba\u77e5\u7684\u79d8\u5bc6\u4e4b\u4e00\uff0cv1.3\u4e2d\u9996\u6b21\u5f15\u5165\u3002\u5927\u90e8\u5206\u60c5\u51b5\u4e0b\uff0creplace()<\/code>\u7684\u4f7f\u7528\u8367\u5149\u7c7b\u4f3c\u4e0b\u9762\uff1a<\/p>\n
\n
alert('10 13 21 48 52'.replace(\/\\d+\/g, '*')); \/\/\u7528 * \u66ff\u6362\u6240\u6709\u7684\u6570\u5b57<\/span><\/pre>\n<\/div>\n
\u8fd9\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u66ff\u6362\uff0c\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u4e00\u4e2a\u661f\u53f7\u3002\u4f46\u662f\uff0c\u5982\u679c\u6211\u4eec\u5e0c\u671b\u5728\u66ff\u6362\u53d1\u751f\u7684\u65f6\u5019\u6709\u66f4\u591a\u7684\u63a7\u5236\uff0c\u8be5\u600e\u4e48\u529e\u5462\uff1f\u6211\u4eec\u53ea\u5e0c\u671b\u66ff\u636230\u4ee5\u4e0b\u7684\u6570\u503c\uff0c\u8be5\u600e\u4e48\u529e\u5462\uff1f\u6b64\u65f6\u5982\u679c\u4ec5\u4ec5\u4f9d\u9760\u6b63\u5219\u8868\u8fbe\u5f0f\u662f\u97ad\u957f\u83ab\u53ca\u7684\u3002\u6211\u4eec\u9700\u8981\u501f\u52a9\u56de\u8c03\u51fd\u6570\u7684\u4e1c\u98ce\u5bf9\u6bcf\u4e2a\u5339\u914d\u8fdb\u884c\u5904\u7406\u3002<\/p>\n
\n
alert('10 13 21 48 52'.replace(\/\\d+\/g, function(match) {\n    return parseInt(match) < 30 ? '*' : match;\n}));<\/pre>\n<\/div>\n
\u5f53\u6bcf\u4e2a\u5339\u914d\u5b8c\u6210\u7684\u65f6\u5019\uff0cJavaScript\u5e94\u7528\u56de\u8c03\u51fd\u6570\uff0c\u4f20\u9012\u5339\u914d\u5185\u5bb9\u7ed9match<\/code>\u53c2\u6570\u3002\u7136\u540e\uff0c\u6839\u636e\u56de\u8c03\u51fd\u6570\u91cc\u9762\u7684\u8fc7\u6ee4\u89c4\u5219\uff0c\u8981\u4e48\u8fd4\u56de\u661f\u53f7\uff0c\u8981\u4e48\u8fd4\u56de\u5339\u914d\u672c\u8eab\uff08\u65e0\u66ff\u6362\u53d1\u751f\uff09\u3002<\/p>\n
\u5982\u4e0b\u622a\u56fe\uff1a
<\/p>\n
\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1areplace()\u63a5\u53d7\u56de\u8c03\u51fd\u6570demo<\/a><\/p>\n
5. \u6b63\u5219\u8868\u8fbe\u5f0f\uff1a\u4e0d\u53ea\u662fmatch\u548creplace<\/h3>\n
\u4e0d\u5c11javascript\u5de5\u7a0b\u5e08\u90fd\u662f\u53ea\u901a\u8fc7match<\/code>\u548creplace<\/code>\u548c\u6b63\u5219\u8868\u8fbe\u5f0f\u6253\u4ea4\u9053\u3002\u4f46JavaScript\u6240\u5b9a\u4e49\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\u76f8\u5173\u65b9\u6cd5\u8fdc\u4e0d\u6b62\u8fd9\u4e24\u4e2a\u3002<\/p>\n
\u5176\u4e2d\u503c\u5f97\u4e00\u63d0\u7684\u662ftest()<\/code>\uff0c\u5176\u5de5\u4f5c\u65b9\u5f0f\u7c7b\u4f3cmatch()<\/code>\uff0c\u4f46\u662f\u8fd4\u56de\u503c\u5374\u4e0d\u4e00\u6837\uff1atest()<\/code>\u8fd4\u56de\u7684\u662f\u5e03\u5c14\u578b\uff0c\u7528\u6765\u9a8c\u8bc1\u662f\u5426\u5339\u914d\uff0c\u6267\u884c\u901f\u5ea6\u9ad8\u4e8ematch()<\/code>\u3002<\/p>\n
\n
alert(\/\\w{3,}\/.test('Hello')); \/\/\u5f39\u51fa 'true'<\/span><\/pre>\n<\/div>\n
\u4e0a\u9762\u884c\u4ee3\u7801\u7528\u6765\u9a8c\u8bc1\u5b57\u7b26\u4e32\u662f\u5426\u6709\u4e09\u4e2a\u4ee5\u4e0a\u666e\u901a\u5b57\u7b26\uff0c\u663e\u7136\"hello\"\u662f\u7b26\u5408\u8981\u6c42\u7684\uff0c\u6240\u4ee5\u5f39\u51fatrue<\/code>\u3002<\/p>\n
\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1atese()\u6d4b\u8bd5demo<\/a><\/p>\n
\u7ed3\u679c\u5982\u4e0b\u622a\u56fe\uff1a
<\/p>\n
\u6211\u4eec\u8fd8\u5e94\u6ce8\u610fRegExp<\/code>\u5bf9\u8c61\uff0c\u4f60\u53ef\u4ee5\u7528\u6b64\u521b\u5efa\u52a8\u6001\u6b63\u5219\u8868\u8fbe\u5f0f\u5bf9\u8c61\uff0c\u4f8b\u5982\uff1a<\/p>\n
\n
function findWord(word, string) {\n    var instancesOfWord = string.match(new RegExp('\\\\b'+word+'\\\\b', 'ig'));\n    alert(instancesOfWord);\n}\nfindWord('car', 'Carl went to buy a car but had forgotten his credit card.');<\/pre>\n<\/div>\n
\u8fd9\u513f\uff0c\u6211\u4eec\u57fa\u4e8e\u53c2\u6570word<\/code>\u52a8\u6001\u521b\u5efa\u4e86\u5339\u914d\u9a8c\u8bc1\u3002\u8fd9\u6bb5\u6d4b\u8bd5\u4ee3\u7801\u4f5c\u7528\u662f\u4e0d\u533a\u5206\u5927\u5c0f\u9009\u7684\u60c5\u51b5\u4e0b\u9009\u62e9car<\/code>\u8fd9\u4e2a\u5355\u8bcd\u3002\u773c\u775b\u4e00\u626b\u800c\u8fc7\uff0c\u6d4b\u8bd5\u82f1\u6587\u53e5\u5b50\u4e2d\u53ea\u6709\u4e00\u4e2a\u5355\u8bcd\u662fcar<\/code>\uff0c\u56e0\u6b64\u8fd9\u91cc\u7684\u6f14\u51fa\u4ec5\u4e00\u4e2a\u5355\u8bcd\u3002\\b<\/code>\u662f\u7528\u6765\u8868\u793a\u5355\u8bcd\u8fb9\u754c\u7684\u3002<\/p>\n
\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a\u4e0a\u8ff0\u52a8\u6001\u6b63\u5219\u8868\u8fbe\u5f0fdemo<\/a><\/p>\n
\u7ed3\u679c\u5982\u4e0b\u622a\u56fe\uff1a
<\/p>\n
\u51fd\u6570\u548c\u4f5c\u7528\u57df<\/h3>\n
6. \u4f60\u53ef\u4ee5\u5192\u5145\u4f5c\u7528\u57df<\/h3>\n
\u4f5c\u7528\u57df\u8fd9\u73a9\u610f\u662f\u7528\u6765\u51b3\u5b9a\u4ec0\u4e48\u53d8\u91cf\u662f\u53ef\u7528\u7684\uff0c\u72ec\u7acb\u7684JavaScript\uff08\u5982JavaScript\u4e0d\u662f\u8fd0\u884c\u4e2d\u51fd\u6570\u4e2d\uff09\u5728window<\/code>\u5bf9\u8c61\u7684\u5168\u5c40\u4f5c\u7528\u57df\u4e0b\u64cd\u4f5c\uff0cwindow<\/code>\u5bf9\u8c61\u5728\u4efb\u4f55\u60c5\u51b5\u4e0b\u90fd\u53ef\u4ee5\u8bbf\u95ee\u3002\u7136\u800c\u51fd\u6570\u4e2d\u58f0\u660e\u7684\u5c40\u90e8\u53d8\u91cf\u53ea\u80fd\u5728\u8be5\u51fd\u6570\u4e2d\u4f7f\u7528\u3002<\/p>\n
\n
var animal = 'dog';\nfunction getAnimal(adjective) { alert(adjective+' '+this.animal); }\ngetAnimal('lovely'); \/\/\u5f39\u51fa 'lovely dog'<\/span><\/pre>\n<\/div>\n
\u8fd9\u513f\u6211\u4eec\u7684\u53d8\u91cf\u548c\u51fd\u6570\u90fd\u58f0\u660e\u5728\u5168\u5c40\u4f5c\u7528\u57df\u4e2d\u3002\u56e0\u4e3athis<\/code>\u6307\u5411\u5f53\u524d\u4f5c\u7528\u57df\uff0c\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\u5c31\u662fwindow<\/code>\u3002\u56e0\u6b64\uff0c\u8be5\u51fd\u6570\u5bfb\u627ewindow.animal<\/code>\uff0c\u4e5f\u5c31\u662f'dog'<\/code>\u4e86\u3002\u5230\u76ee\u524d\u4e3a\u6b62\uff0c\u4e00\u5207\u6b63\u5e38\u3002\u7136\u800c\uff0c\u5b9e\u9645\u4e0a\uff0c\u6211\u4eec\u53ef\u4ee5\u8ba9\u51fd\u6570\u8fd0\u884c\u5728\u4e0d\u540c\u7684\u4f5c\u7528\u57df\u4e0b\uff0c\u800c\u5ffd\u89c6\u5176\u672c\u8eab\u7684\u4f5c\u7528\u57df\u3002\u6211\u4eec\u53ef\u4ee5\u7528\u4e00\u4e2a\u5185\u7f6e\u7684\u79f0\u4e3acall()<\/code>\u7684\u65b9\u6cd5\u6765\u5b9e\u73b0\u4f5c\u7528\u57df\u7684\u5192\u5145\u3002<\/p>\n
\n
var animal = 'dog';\nfunction getAnimal(adjective) { alert(adjective+' '+this.animal); };\nvar myObj = {animal: 'camel'};\ngetAnimal.call(myObj, 'lovely'); \/\/\u5f39\u51fa 'lovely camel'<\/span><\/pre>\n<\/div>\n
call()<\/code>\u65b9\u6cd5\u4e2d\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u53ef\u4ee5\u5192\u5145\u51fd\u6570\u4e2d\u7684this<\/code>\uff0c\u56e0\u6b64\uff0c\u8fd9\u91cc\u7684this.animal<\/code>\u5b9e\u9645\u4e0a\u5c31\u662fmyObj.animal<\/code>\uff0c\u4e5f\u5c31\u662f'camel'<\/code>\u4e86\u3002\u540e\u9762\u7684\u53c2\u6570\u5c31\u4f5c\u4e3a\u666e\u901a\u53c2\u6570\u4f20\u7ed9\u51fd\u6570\u4f53\u3002<\/p>\n
\u53e6\u5916\u4e00\u4e2a\u4e0e\u4e4b\u76f8\u5173\u7684\u662fapply()<\/code>\u65b9\u6cd5\uff0c\u5176\u4f5c\u7528\u4e8ecall()<\/code>\u4e00\u6837\uff0c\u4e0d\u540c\u4e4b\u5904\u5728\u4e8e\uff0c\u4f20\u9012\u7ed9\u51fd\u6570\u7684\u53c2\u6570\u662f\u4ee5\u6570\u7ec4\u5f62\u5f0f\u8868\u793a\u7684\uff0c\u800c\u4e0d\u662f\u72ec\u7acb\u7684\u53d8\u91cf\u4eec\u3002\u6240\u4ee5\uff0c\u4e0a\u9762\u7684\u6d4b\u8bd5\u4ee3\u7801\u5982\u679c\u7528apply()<\/code>\u8868\u793a\u5c31\u662f\uff1a<\/p>\n
\n
getAnimal.apply(myObj, ['lovely']); \/\/\u51fd\u6570\u53c2\u6570\u4ee5\u6570\u7ec4\u5f62\u5f0f\u53d1\u9001<\/span><\/pre>\n<\/div>\n
\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a\u51fd\u6570\u4f5c\u7528\u57df\u5192\u5145demo<\/a><\/p>\n
demo\u9875\u9762\u4e2d\uff0c\u70b9\u51fb\u7b2c\u4e00\u4e2a\u6309\u94ae\u7684\u7ed3\u679c\u5982\u4e0b\u622a\u56fe\uff1a

\u70b9\u51fb\u7b2c\u4e8c\u4e2a\u548c\u7b2c\u4e09\u4e2a\u6309\u94ae\u7684\u7ed3\u679c\u5982\u4e0b\uff1a
<\/p>\n
\u5982\u679c\u60a8\u770b\u5230\u4e0b\u9762\u7684\u6587\u5b57\uff0c\u53ef\u80fd\u662f\u7531\u4e8e\u5728\u5176\u4ed6\u7f51\u7ad9\u6216\u662fRSS\u4e2d\u9605\u8bfb\u672c\u6587\uff0c\u672c\u6587\u539f\u5730\u5740\uff1ahttp:\/\/www.zhangxinxu.com\/wordpress\/?p=1591<\/a>\uff0c\u672c\u6587\u4f5c\u8005\uff1a\u5f20\u946b\u65ed<\/a>\uff0c\u6765\u81ea\u5f20\u946b\u65ed-\u946b\u7a7a\u95f4-\u946b\u751f\u6d3b\uff0c\u8bbf\u95ee\u539f\u51fa\u5904\u66f4\u591a\u7cbe\u5f69\u5185\u5bb9\u3002<\/em><\/div>\n
7. \u51fd\u6570\u53ef\u4ee5\u6267\u884c\u5176\u672c\u8eab<\/h3>\n
\u4e0b\u9762\u8fd9\u4e2a\u662f\u5f88OK\u7684\uff1a<\/p>\n
\n
(function() { alert('hello'); })(); \/\/\u5f39\u51fa 'hello'<\/span><\/pre>\n<\/div>\n
\u8fd9\u91cc\u7684\u89e3\u6790\u8db3\u591f\u7b80\u5355\uff1a\u58f0\u660e\u4e00\u4e2a\u51fd\u6570\uff0c\u7136\u540e\u56e0\u4e3a()<\/code>\u89e3\u6790\u7acb\u5373\u6267\u884c\u5b83\u3002\u4f60\u53ef\u80fd\u4f1a\u5947\u602a\u4e3a\u4f55\u8981\u8fd9\u4e48\u505a\uff08\u6307\u76f4\u63a5\u5c41\u80a1\u540e\u9762()<\/code>\u8c03\u7528\uff09\uff0c\u8fd9\u770b\u4e0a\u53bb\u662f\u6709\u70b9\u81ea\u76f8\u77db\u76fe\u7684\uff1a\u51fd\u6570\u5305\u542b\u7684\u901a\u5e38\u662f\u6211\u4eec\u60f3\u7a0d\u540e\u6267\u884c\u7684\u4ee3\u7801\uff0c\u800c\u4e0d\u662f\u5f53\u4e0b\u89e3\u6790\u5373\u6267\u884c\u7684\uff0c\u5426\u5219\uff0c\u6211\u4eec\u5c31\u6ca1\u6709\u5fc5\u8981\u628a\u4ee3\u7801\u653e\u5728\u51fd\u6570\u4e2d\u3002<\/p>\n
\u53e6\u5916\u4e00\u4e2a\u6267\u884c\u51fd\u6570\u81ea\u8eab(self-executing functions (SEFs))\u7684\u4e0d\u9519\u4f7f\u7528\u662f\u4e3a\u5728\u5ef6\u8fdf\u4ee3\u7801\u4e2d\u4f7f\u7528\u7ed1\u5b9a\u53d8\u91cf\u503c\uff0c\u4f8b\u5982\u4e8b\u4ef6\u7684\u56de\u8c03(callback)\uff0c\u8d85\u65f6\u6267\u884c(timeouts)\u548c\u95f4\u9694\u6267\u884c(intervals)\u3002\u5982\u4e0b\u4f8b\u5b50\uff1a<\/p>\n
\n
var someVar = 'hello';\nsetTimeout(function() { alert(someVar); }, 1000);\nvar someVar = 'goodbye';<\/pre>\n<\/div>\n
Newbies\u5728\u8bba\u575b\u91cc\u603b\u95ee\u8fd9\u91cctimeout<\/code>\u7684\u5f39\u51fa\u4e3a\u4ec0\u4e48\u662fgoodbye<\/code>\u800c\u4e0d\u662fhello<\/code>\uff1f\u7b54\u6848\u5c31timeout<\/code>\u4e2d\u7684\u56de\u8c03\u51fd\u6570\u76f4\u5230\u5176\u8fd0\u884c\u7684\u65f6\u5019\u624d\u53bb\u8d4b\u503csomeVar<\/code>\u53d8\u91cf\u7684\u503c\u3002\u800c\u90a3\u4e2a\u65f6\u5019\uff0csomeVar<\/code>\u5df2\u7ecf\u88abgoodbye<\/code>\u91cd\u5199\u4e86\u597d\u957f\u65f6\u95f4\u4e86\u3002<\/p>\n
SEFs\u63d0\u4f9b\u4e86\u4e00\u4e2a\u89e3\u51b3\u6b64\u95ee\u9898\u7684\u65b9\u6cd5\u3002\u4e0d\u662f\u50cf\u4e0a\u9762\u4e00\u6837\u542b\u84c4\u5730\u6307\u5b9atimeout\u56de\u8c03\uff0c\u800c\u662f\u76f4\u63a5\u5c06someVar<\/code>\u503c\u4ee5\u53c2\u6570\u7684\u5f62\u5f0f\u4f20\u8fdb\u53bb\u3002\u6548\u679c\u663e\u8457\uff0c\u8fd9\u610f\u5473\u7740\u6211\u4eec\u4f20\u5165\u5e76\u5b64\u7acb\u4e86someVar<\/code>\u503c\uff0c\u4fdd\u62a4\u5176\u65e0\u8bba\u540e\u9762\u662f\u5730\u9707\u6d77\u5578\u8fd8\u662f\u5973\u670b\u53cb\u53d1\u98d9\u5486\u54ee\u90fd\u4e0d\u4f1a\u6539\u53d8\u3002<\/p>\n
\n
var someVar = 'hello';\nsetTimeout((function(someVar) {\n\treturn function()  { alert(someVar); }\n})(someVar), 1000);\nvar someVar = 'goodbye';<\/pre>\n<\/div>\n
\u98ce\u6c34\u8f6e\u6d41\u8f6c\uff0c\u8fd9\u6b21\uff0c\u8fd9\u91cc\u7684\u5f39\u51fa\u5c31\u662fhello<\/code>\u4e86\u3002\u8fd9\u5c31\u662f\u51fd\u6570\u53c2\u6570\u548c\u5916\u90e8\u53d8\u91cf\u7684\u70b9\u5dee\u522b\u4e86\u54c8\u3002<\/p>\n
\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a\u51fd\u6570\u6267\u884c\u81ea\u8eab\u6d4b\u8bd5demo<\/a><\/p>\n
\u4f8b\u5982\uff0c\u6700\u540e\u4e00\u4e2a\u6309\u94ae\u70b9\u51fb\u540e\u7684\u5f39\u51fa\u5982\u4e0b\uff1a
<\/p>\n
\u6d4f\u89c8\u5668<\/h3>\n
8. FireFox\u4ee5RGB\u683c\u5f0f\u8bfb\u4e0e\u8fd4\u56de\u989c\u8272\u800c\u975eHex<\/h3>\n
\u76f4\u5230\u73b0\u5728\u6211\u90fd\u6ca1\u6709\u771f\u6b63\u7406\u89e3\u4e3a\u4f55Mozilla\u4f1a\u8fd9\u6837\u5b50\u3002\u4e3a\u4e86\u6709\u4e2a\u6e05\u6670\u7684\u8ba4\u8bc6\uff0c\u770b\u4e0b\u9762\u8fd9\u4e2a\u4f8b\u5b50\uff1a<\/p>\n
\n
<!--\n#somePara { color: #f90; }\n--><\/span>\n\n<p id=\"somePara\">Hello, world!<\/p>\n\n<script><\/span>\nvar ie = navigator.appVersion.indexOf('MSIE') != -1;\nvar p = document.getElementById('somePara');\nalert(ie ? p.currentStyle.color : getComputedStyle(p, null).color);\n<\/script><\/span><\/pre>\n<\/div>\n
\u5927\u90e8\u5206\u6d4f\u89c8\u5668\u5f39\u51fa\u7684\u7ed3\u679c\u662fff9900<\/code>\uff0c\u800cFireFox\u7684\u7ed3\u679c\u5374\u662frgb(255, 153, 0)<\/code>\uff0cRGB\u7684\u5f62\u5f0f\u3002\u7ecf\u5e38\uff0c\u5904\u7406\u989c\u8272\u7684\u65f6\u5019\uff0c\u6211\u4eec\u9700\u8981\u82b1\u8d39\u4e0d\u5c11\u4ee3\u7801\u5c06RGB\u989c\u8272\u8f6c\u4e3aHex\u3002<\/p>\n
\u4e0b\u9762\u662f\u4e0a\u9762\u4ee3\u7801\u5728\u4e0d\u540c\u6d4f\u89c8\u5668\u4e0b\u7684\u7ed3\u679c\uff1a
<\/p>\n
\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a\u4e0d\u540c\u6d4f\u89c8\u5668\u7684\u989c\u8272\u8fd4\u56de\u5dee\u5f02demo<\/a><\/p>\n
\u5176\u5b83\u6742\u4e03\u6742\u516b<\/h3>\n
9. 0.1 + 0.2 !== 0.3<\/h3>\n
\u8fd9\u4e2a\u53e4\u602a\u7684\u95ee\u9898\u4e0d\u53ea\u4f1a\u51fa\u73b0\u5728JavaScript\u4e2d\uff0c\u8fd9\u662f\u8ba1\u7b97\u673a\u79d1\u5b66\u4e2d\u4e00\u4e2a\u666e\u904d\u5b58\u5728\u7684\u95ee\u9898\uff0c\u5f71\u54cd\u4e86\u5f88\u591a\u7684\u8bed\u8a00\u3002\u6807\u9898\u7b49\u5f0f\u8f93\u51fa\u7684\u7ed3\u679c\u662f0.30000000000000004\u3002<\/p>\n
\u8fd9\u662f\u4e2a\u88ab\u79f0\u4e3a\u673a\u5668\u7cbe\u5ea6\u7684\u95ee\u9898\u3002\u5f53JavaScript\u5c1d\u8bd5\u6267\u884c(0.1 + 0.2)\u8fd9\u884c\u4ee3\u7801\u7684\u65f6\u5019\uff0c\u4f1a\u628a\u503c\u8f6c\u6362\u6210\u5b83\u4eec\u559c\u6b22\u7684\u4e8c\u8fdb\u5236\u53e3\u5473\u3002\u8fd9\u5c31\u662f\u95ee\u9898\u7684\u8d77\u6e90\uff0c0.1\u5b9e\u9645\u4e0a\u5e76\u4e0d\u662f0.1\uff0c\u800c\u662f\u5176\u4e8c\u8fdb\u5236\u5f62\u5f0f\u3002\u4ece\u672c\u8d28\u4e0a\u5c06\uff0c\u5f53\u4f60\u5199\u4e0b\u8fd9\u4e9b\u503c\u7684\u65f6\u5019\uff0c\u5b83\u4eec\u6ce8\u5b9a\u8981\u5931\u53bb\u7cbe\u5ea6\u3002\u4f60\u53ef\u80fd\u53ea\u662f\u5e0c\u671b\u5f97\u5230\u4e2a\u7b80\u5355\u7684\u4e24\u4f4d\u5c0f\u6570\uff0c\u4f46\u4f60\u5f97\u5230\u7684\uff08\u6839\u636eChris Pine\u7684\u6ce8\u89e3<\/a>\uff09\u662f\u4e8c\u8fdb\u5236\u6d6e\u70b9\u8ba1\u7b97\u3002\u597d\u6bd4\u4f60\u60f3\u628a\u4e00\u6bb5\u5e94\u8be5\u7ffb\u8bd1\u6210\u4e2d\u6587\u7b80\u4f53\uff0c\u7ed3\u679c\u51fa\u6765\u7684\u786e\u5b9e\u7e41\u4f53\uff0c\u5176\u4e2d\u8fd8\u662f\u6709\u5dee\u5f02\u662f\u4e0d\u4e00\u6837\u7684\u3002<\/p>\n
\u4e00\u822c\u5904\u7406\u4e0e\u6b64\u76f8\u5173\u7684\u95ee\u9898\u6709\u4e24\u4e2a\u505a\u6cd5\uff1a<\/p>\n
    \n
  1. \u8f6c\u6362\u6210\u6574\u6570\u5728\u8ba1\u7b97\uff0c\u8ba1\u7b97\u5b8c\u6bd5\u5728\u8f6c\u6362\u6210\u5e0c\u671b\u7684\u5c0f\u6570\u5185\u5bb9<\/li>\n
  2. \u8c03\u6574\u4f60\u7684\u903b\u8f91\uff0c\u8bbe\u5b9a\u5141\u8bb8\u8303\u56f4\u4e3a\u4e0d\u662f\u6307\u5b9a\u7ed3\u679c\u3002<\/li>\n<\/ol>\n
    \u4f8b\u5982\uff0c\u6211\u4eec\u4e0d\u5e94\u8be5\u4e0b\u9762\u8fd9\u6837\uff1a<\/p>\n
    \n
    var num1 = 0.1, num2 = 0.2, shouldEqual = 0.3;\nalert(num1 + num2 == shouldEqual); \/\/false<\/span><\/pre>\n<\/div>\n
    \u800c\u53ef\u4ee5\u8bd5\u8bd5\u8fd9\u6837\uff1a<\/p>\n
    \n
    alert(num1 + num2 > shouldEqual - 0.001 && num1 + num2 < shouldEqual + 0.001); \/\/true<\/span><\/pre>\n<\/div>\n
    10. \u672a\u5b9a\u4e49(undefined)\u53ef\u4ee5\u88ab\u5b9a\u4e49(defined)<\/h3>\n
    \u6211\u4eec\u4ee5\u4e00\u4e2a\u548c\u98ce\u7ec6\u96e8\u7684\u5c0f\u53e4\u602a\u7ed3\u675f\u3002\u542c\u8d77\u6765\u53ef\u80fd\u6709\u70b9\u5947\u602a\uff0cundefined<\/code>\u5e76\u4e0d\u662fJavaScript\u4e2d\u7684\u4fdd\u7559\u5b57\uff0c\u5c3d\u7ba1\u5b83\u6709\u7279\u6b8a\u7684\u610f\u4e49\uff0c\u5e76\u4e14\u662f\u552f\u4e00\u7684\u65b9\u6cd5\u786e\u5b9e\u53d8\u91cf\u662f\u5426\u672a\u5b9a\u4e49\u3002\u56e0\u6b64\uff1a<\/p>\n
    \n
    var someVar;\nalert(someVar == undefined); \/\/\u663e\u793a true<\/span><\/pre>\n<\/div>\n
    \u76ee\u524d\u4e3a\u6b62\uff0c\u4e00\u5207\u770b\u4e0a\u53bb\u98ce\u5e73\u6d6a\u9759\uff0c\u6b63\u5e38\u65e0\u6bd4\uff0c\u4f46\u5267\u60c5\u603b\u662f\u5f88\u72d7\u8840\uff1a<\/p>\n
    \n
    undefined = \"I'm not undefined!\";\nvar someVar;\nalert(someVar == undefined); \/\/\u663e\u793a false!<\/span><\/pre>\n<\/div>\n
    \u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48jQuery\u6e90\u7801\u4e2d\u6700\u5916\u90e8\u7684\u95ed\u5305\u51fd\u6570\u8981\u6709\u4e2a\u5e76\u6ca1\u6709\u4f20\u5165\u7684undefined<\/code>\u53c2\u6570\uff0c\u76ee\u7684\u5c31\u662f\u4fdd\u62a4undefined<\/code>\u4e0d\u8981\u88ab\u5916\u90e8\u7684\u4e9b\u4e0d\u826f\u4e58\u865a\u800c\u5165\u3002<\/p>\n
    <\/p>\n
    \/\/zxx:\u4ee5\u4e0a\u4e3a\u4e3b\u4f53\u5168\u90e8\u5185\u5bb9<\/span><\/p>\n
    \u8bd1\u8005\u7ed3\u8bed<\/h3>\n
    \u6700\u8fd1\u7410\u4e8b\u592a\u591a\uff0c\u6587\u7ae0\u6298\u817e\u7684\u6709\u70b9\u4e45\u3002\u6700\u8fd1\u72b6\u6001\u4e0d\u4f73\uff0c\u6587\u4e2d\u96be\u514d\u6709\u8868\u8ff0\u4e0d\u51c6\u786e\u7684\u5730\u65b9\uff0c\u6b22\u8fce\u6307\u6b63\uff0c\u611f\u8c22\u9605\u8bfb\u3002<\/p>\n
    \u672c\u6587\u4e3a\u539f\u521b\u6587\u7ae0\uff0c\u8f6c\u8f7d\u8bf7\u6ce8\u660e\u6765\u81ea\u5f20\u946b\u65ed-\u946b\u7a7a\u95f4-\u946b\u751f\u6d3b<\/a>[http:\/\/www.zhangxinxu.com<\/a>]
    \n\u672c\u6587\u5730\u5740\uff1a    http:\/\/www.zhangxinxu.com\/wordpress\/?p=1703<\/a><\/p>\n
    \uff08\u672c\u7bc7\u5b8c\uff09<\/p>\n","protected":false},"excerpt":{"rendered":"
    <\/a>
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