{"id":112,"date":"2025-10-18T15:24:58","date_gmt":"2025-10-18T07:24:58","guid":{"rendered":"http:\/\/47.99.178.170\/?p=112"},"modified":"2025-10-18T15:41:05","modified_gmt":"2025-10-18T07:41:05","slug":"javascript%e5%9f%ba%e6%9c%ac%e8%af%ad%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.garfield-blog.top\/?p=112","title":{"rendered":"\u3010\u7f16\u7a0b\u8bed\u8a00\u5b66\u4e60\u3011Javascript\u57fa\u672c\u8bed\u6cd5"},"content":{"rendered":"\n<p>\u53c2\u8003\u6587\u6863\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>JavaScript\u9ad8\u7ea7\u7a0b\u5e8f\u8bbe\u8ba1(\u4e2d\u6587)-\u7b2c3\u7248 \u4eba\u6c11\u90ae\u7535\u51fa\u7248\u793e \u3010\u7f8e\u3011Nicholas C.Zakas \u8457 \u674e\u677e\u5cf0 \u66f9\u529b \u8bd1<\/li>\n\n\n\n<li>MDN Web Docs <a href=\"https:\/\/developer.mozilla.org\/zh-CN\/\">MDN Web Docs (mozilla.org)<\/a><\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">1. \u5728HTML\u4e2d\u4f7f\u7528JavaScript<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u811a\u672c\u53ef\u4f4d\u4e8e <code>HTML<\/code> \u7684 <code>&lt;body&gt;<\/code> \u6216 <code>&lt;head&gt;<\/code> \u90e8\u5206\u4e2d\uff0c\u6216\u8005\u540c\u65f6\u5b58\u5728\u4e8e\u4e24\u4e2a\u90e8\u5206\u4e2d\u3002<\/li>\n\n\n\n<li>\u901a\u5e38\u7684\u505a\u6cd5\u662f\u628a\u51fd\u6570\u653e\u5165 <code>&lt;head&gt;<\/code> \u90e8\u5206\u4e2d\uff0c\u6216\u8005\u653e\u5728\u9875\u9762\u5e95\u90e8\u3002\u8fd9\u6837\u5c31\u53ef\u4ee5\u628a\u5b83\u4eec\u5b89\u7f6e\u5230\u540c\u4e00\u5904\u4f4d\u7f6e\uff0c\u4e0d\u4f1a\u5e72\u6270\u9875\u9762\u7684\u5185\u5bb9\u3002<\/li>\n\n\n\n<li>\u5728<code>&lt;head&gt;<\/code>\u4e2d\u7684<code>JavaScript<\/code>\u51fd\u6570<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!DOCTYPE html&gt;\n&lt;html&gt;\n\n&lt;head&gt;\n    &lt;script&gt;\n        function myFunction() {\n            document.getElementById(\"demo\").innerHTML = \"\u6211\u7684\u7b2c\u4e00\u4e2a JavaScript \u51fd\u6570\";\n        }\n    &lt;\/script&gt;\n&lt;\/head&gt;\n\n&lt;body&gt;\n    &lt;h1&gt;\u6211\u7684 Web \u9875\u9762&lt;\/h1&gt;\n    &lt;p id=\"demo\"&gt;\u4e00\u4e2a\u6bb5\u843d&lt;\/p&gt;\n    &lt;button type=\"button\" onclick=\"myFunction()\"&gt;\u5c1d\u8bd5\u4e00\u4e0b&lt;\/button&gt;\n&lt;\/body&gt;\n\n&lt;\/html&gt;<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>&lt;body&gt;<\/code> \u4e2d\u7684 JavaScript \u51fd\u6570<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!DOCTYPE html&gt;\n&lt;html&gt;\n\n&lt;body&gt;\n    &lt;h1&gt;\u6211\u7684 Web \u9875\u9762&lt;\/h1&gt;\n    &lt;p id=\"demo\"&gt;\u4e00\u4e2a\u6bb5\u843d&lt;\/p&gt;\n    &lt;button type=\"button\" onclick=\"myFunction()\"&gt;\u5c1d\u8bd5\u4e00\u4e0b&lt;\/button&gt;\n    &lt;script&gt;\n        function myFunction() {\n            document.getElementById(\"demo\").innerHTML = \"\u6211\u7684\u7b2c\u4e00\u4e2a JavaScript \u51fd\u6570\";\n        }\n    &lt;\/script&gt;\n&lt;\/body&gt;\n\n&lt;\/html&gt;<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">2.\u6570\u636e\u7c7b\u578b<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>JavaScript<\/code> \u62e5\u6709\u52a8\u6001\u7c7b\u578b\u3002\u8fd9\u610f\u5473\u7740\u76f8\u540c\u7684\u53d8\u91cf\u53ef\u7528\u4f5c\u4e0d\u540c\u7684\u7c7b\u578b\uff1b\u53d8\u91cf\u7684\u6570\u636e\u7c7b\u578b\u53ef\u4ee5\u4f7f\u7528 <code>typeof<\/code> \u64cd\u4f5c\u7b26\u6765\u67e5\u770b<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2.1 \u57fa\u672c\u7c7b\u578b<\/h3>\n\n\n\n<p><code>JavaScript<\/code>\u4e2d\u6709<code>6<\/code>\u79cd\u503c\u7c7b\u578b\uff08\u57fa\u672c\u7c7b\u578b\uff09\u53d8\u91cf<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>String<\/code> \uff08\u5b57\u7b26\u4e32\uff09\n<ul class=\"wp-block-list\">\n<li>\u5b57\u7b26\u4e32\u662f\u5b58\u50a8\u5b57\u7b26\u7684\u53d8\u91cf\uff0c\u5b57\u7b26\u4e32\u53ef\u4ee5\u662f\u5f15\u53f7\u4e2d\u7684\u4efb\u610f\u6587\u672c\u3002\u53ef\u4ee5\u4f7f\u7528\u5355\u5f15\u53f7\u6216\u53cc\u5f15\u53f7<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>var carname=\"Volvo XC60\";\nvar carname='Volvo XC60';\n\n\/\/\u5728\u5b57\u7b26\u4e32\u4e2d\u5305\u542b\u5f15\u53f7\nvar answer=\"He is called 'Johnny'\";\nvar answer='He is called \"Johnny\"';\n<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>Number<\/code> \uff08\u6570\u5b57\uff09\n<ul class=\"wp-block-list\">\n<li><code>JavaScript<\/code> \u53ea\u6709\u4e00\u79cd\u6570\u5b57\u7c7b\u578b\u3002\u6570\u5b57\u53ef\u4ee5\u5e26\u5c0f\u6570\u70b9\uff0c\u4e5f\u53ef\u4ee5\u4e0d\u5e26<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>var x1=34.00;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;     \/\/\u4f7f\u7528\u5c0f\u6570\u70b9\u6765\u5199\nvar x2=34;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;     \/\/\u4e0d\u4f7f\u7528\u5c0f\u6570\u70b9\u6765\u5199\n\n\/* \u79d1\u5b66\u8ba1\u6570\u6cd5 *\/\nvar y=123e5;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;      \/\/ 12300000\nvar z=123e-5;&nbsp;&nbsp;&nbsp;&nbsp;      \/\/ 0.00123<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>Boolean<\/code> \uff08\u5e03\u5c14\uff09\n<ul class=\"wp-block-list\">\n<li>\u5e03\u5c14\uff08\u903b\u8f91\uff09\u53ea\u80fd\u6709\u4e24\u4e2a\u503c\uff1a<code>true <\/code>\u6216 <code>false<\/code><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>var x=true;\nvar y=false;<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>Null<\/code> \uff08\u7a7a\uff09\n<ul class=\"wp-block-list\">\n<li><code>Null<\/code>\u7c7b\u578b\u53ea\u6709\u4e00\u4e2a\u503c\uff0c\u5373\u7279\u6b8a\u7684<code>Null<\/code>\uff0c\u4ece\u903b\u8f91\u89d2\u5ea6\u770bnull\u503c\u8868\u793a\u4e00\u4e2a\u7a7a\u6307\u9488\u5bf9\u8c61<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><code>Undefined<\/code> \uff08\u672a\u5b9a\u4e49\uff09<\/li>\n\n\n\n<li><code>Undefined<\/code> \u7c7b\u578b\u53ea\u6709\u4e00\u4e2a\u503c\uff0c\u5373\u7279\u6b8a\u7684<code>undefined<\/code>\uff0c\u5728\u4f7f\u7528<code>var<\/code>\u58f0\u660e\u53d8\u91cf\u4f46\u672a\u5bf9\u5176\u52a0\u4ee5\u521d\u59cb\u5316\u65f6\uff0c\u8fd9\u4e2a\u53d8\u91cf\u7684\u503c\u5c31\u662f<code>undefined<\/code><\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>var x;<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>Symbol<\/code>\n<ul class=\"wp-block-list\">\n<li><code>symbol<\/code>\u662f\u4e00\u4e2a<code>ES6\u6807\u51c6<\/code>\u79cd\u65b0\u589e\u7684\u4e00\u79cd\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff1b<code>symbol<\/code> \u7684\u503c\u662f\u901a\u8fc7 <code>Symbol()<\/code> \u51fd\u6570\u751f\u6210\uff0c\u6bcf\u4e00\u4e2a <code>symbol<\/code> \u7684\u503c\u90fd\u662f\u552f\u4e00\u7684\uff0c\u5e76\u4e14\u53ef\u4ee5\u4f5c\u4e3a\u5bf9\u8c61\u7684\u5c5e\u6027\u6807\u8bc6\u7b26\u4f7f\u7528<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2.2 \u5bf9\u8c61\u7c7b\u578b<\/h3>\n\n\n\n<p>\u4e09\u79cd\u5f15\u7528\u6570\u636e\u7c7b\u578b\uff08\u5bf9\u8c61\u7c7b\u578b\uff09<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>Object<\/code>\uff08\u5bf9\u8c61\uff09\n<ul class=\"wp-block-list\">\n<li>\u5bf9\u8c61\u7531\u82b1\u62ec\u53f7\u5206\u9694\u3002\u5728\u62ec\u53f7\u5185\u90e8\uff0c\u5bf9\u8c61\u7684\u5c5e\u6027\u4ee5\u540d\u79f0\u548c\u503c\u5bf9\u7684\u5f62\u5f0f (<code>name : value<\/code>) \u6765\u5b9a\u4e49\uff0c\u5c5e\u6027\u7531\u9017\u53f7\u5206\u9694<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>\/* \u521b\u5efaObject\u53d8\u91cf\u5e76\u521d\u59cb\u5316\n * \u98ce\u683c1.\u4f7f\u7528new\u64cd\u4f5c\u7b26\u540e\u8ddfObject\u6784\u9020\u51fd\u6570\n *\/\nvar person = new Object();\nperson.name = \"tom\";\nperson.age = \"3\";\n\n\/* \u98ce\u683c2.\u5728\u521b\u5efa\u53d8\u91cf\u65f6\u76f4\u63a5\u8d4b\u503c *\/\nvar person = {\n    name:\"tom\",\n    age:\"3\"\n};<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>Array<\/code>\uff08\u6570\u7ec4\uff09\n<ul class=\"wp-block-list\">\n<li>\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e00\u9879\u90fd\u53ef\u4ee5\u4fdd\u5b58\u4efb\u4f55\u7c7b\u578b\u7684\u6570\u636e<\/li>\n\n\n\n<li>\u6570\u7ec4\u7684\u5927\u5c0f\u662f\u53ef\u4ee5\u52a8\u6001\u8c03\u6574\u7684\uff0c\u5373\u53ef\u4ee5\u968f\u7740\u6570\u636e\u7684\u6dfb\u52a0\u81ea\u52a8\u589e\u957f\u4ee5\u5bb9\u7eb3\u65b0\u589e\u6570\u636e<\/li>\n\n\n\n<li>\u6570\u7ec4\u5143\u7d20\u53ef\u4ee5\u901a\u8fc7\u6570\u7ec4\u4e0b\u6807\u7684\u5f62\u5f0f\u8bbf\u95ee<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>\/* \u521b\u5efa\u6570\u7ec4\u957f\u5ea6\u57fa\u672c\u65b9\u5f0f \n * \u65b9\u5f0f1.\u4f7f\u7528Array\u6784\u9020\u51fd\u6570\n *\/\nvar colors_1 = new Array();                           \/\/\u4f7f\u7528Array\u6784\u9020\u51fd\u6570\u521b\u5efa\u6570\u7ec4\nvar colors_2 = new Array(20);                         \/\/\u521b\u5efa\u6570\u7ec4\u65f6\u6307\u5b9a\u6570\u7ec4\u7684\u957f\u5ea6\nvar colors_3 = new Array(\"red\", \"blue\", \"green\");    \/\/\u5728\u6784\u5efa\u51fd\u6570\u65f6\u6307\u5b9a\u6570\u7ec4\u4e2d\u5305\u542b\u7684\u503c   \nvar colors_4 = new Array(\"Greg\");                   \/\/\u521b\u5efa\u4e00\u4e2a\u5305\u542b1\u9879\uff0c\u5373\u5b57\u7b26\u4e32\u201cGreg\u201d\u7684\u6570\u7ec4\n\n\/* \u65b9\u5f0f2.\u521b\u5efa\u6570\u7ec4\u65f6\u6307\u5b9a\u6570\u7ec4\u7684\u5185\u5bb9 *\/\nvar arr_1 = &#91;\"a\", \"b\", \"c\"];                        \/\/\u521b\u5efa\u4e00\u4e2a\u5305\u542b\u4e09\u4e2a\u5b57\u7b26\u4e32\u7684\u6570\u7ec4\nvar arr_2 = &#91;];                                     \/\/\u521b\u5efa\u4e00\u4e2a\u7a7a\u6570\u7ec4<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>Function<\/code>\uff08\u51fd\u6570\uff09\n<ul class=\"wp-block-list\">\n<li>\u5728<code>JavaScript<\/code>\u4e2d\u51fd\u6570\u5b9e\u9645\u4e0a\u662f\u5bf9\u8c61\uff0c\u6bcf\u4e2a\u51fd\u6570\u90fd\u662f<code>Function<\/code>\u7c7b\u578b\u7684\u5b9e\u4f8b\uff0c\u800c\u4e14\u90fd\u4e0e\u5176\u4ed6\u5f15\u7528\u7c7b\u578b\u4e00\u6837\u5177\u6709\u5c5e\u6027\u548c\u65b9\u6cd5\uff1b\u7531\u4e8e\u51fd\u6570\u662f\u5bf9\u8c61\uff0c\u56e0\u6b64\u51fd\u6570\u540d\u5b9e\u9645\u4e0a\u4e5f\u662f\u4e00\u4e2a\u6307\u5411\u51fd\u6570\u5bf9\u8c61\u7684\u6307\u9488\uff0c\u4e0d\u4f1a\u548c\u67d0\u4e2a\u51fd\u6570\u7ed1\u5b9a<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>function sum (num1, num2) {\n    return num1 + num2;\n}\n\n\/* \u8c03\u7528\u53d8\u91cfsum_3\u7b49\u4ef7\u4e8e\u8c03\u7528\u51fd\u6570sum *\/\nvar sum_3 = function sum_1 (num1, num2) {\n    return num1 + num2;\n};<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">2.3 \u7279\u6b8a\u7c7b\u578b\u5bf9\u8c61<\/h3>\n\n\n\n<p>\u4e24\u79cd\u7279\u6b8a\u7684\u5bf9\u8c61<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>RegExp<\/code>\uff08\u6b63\u5219\uff09\n<ul class=\"wp-block-list\">\n<li><code>JavaScript<\/code>\u901a\u8fc7<code>RegExp<\/code>\u7c7b\u578b\u6765\u652f\u6301\u6b63\u5219\u8868\u8fbe\u5f0f\uff0c\u5176\u4e2d\u7684\u6a21\u5f0f\u90e8\u5206\u53ef\u4ee5\u662f\u4efb\u4f55\u7b80\u5355\u6216\u590d\u6742\u7684\u6b63\u5219\u8868\u8fbe\u5f0f<\/li>\n\n\n\n<li>\u6bcf\u4e2a\u8868\u8fbe\u5f0f\u90fd\u53ef\u5e26\u6709\u4e00\u6216\u591a\u4e2a\u6807\u5fd7\uff0c\u7528\u4ee5\u6807\u660e\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u884c\u4e3a\n<ul class=\"wp-block-list\">\n<li><code>g<\/code>\uff1a\u8868\u793a\u5168\u5c40\uff08<code>global<\/code>\uff09\u6a21\u5f0f\uff0c\u5373\u6a21\u5f0f\u5c06\u88ab\u5e94\u7528\u4e8e\u6240\u6709\u5b57\u7b26\u4e32\uff0c\u800c\u5e76\u975e\u5728\u53d1\u73b0\u7b2c\u4e00\u4e2a\u5339\u914d\u9879\u65f6\u7acb\u5373\u505c\u6b62<\/li>\n\n\n\n<li><code>i<\/code>\uff1a\u8868\u793a\u4e0d\u533a\u5206\u5927\u5c0f\u5199\u6a21\u5f0f\uff0c\u5373\u786e\u5b9a\u5339\u914d\u9879\u65f6\u5ffd\u7565\u6a21\u5f0f\u4e0e\u5b57\u7b26\u4e32\u7684\u5927\u5c0f\u5199<\/li>\n\n\n\n<li><code>m<\/code>\uff1a\u8868\u793a\u591a\u884c\u6a21\u5f0f\uff0c\u5373\u5728\u5230\u8fbe\u4e00\u884c\u6587\u672c\u672b\u5c3e\u65f6\u8fd8\u4f1a\u7ee7\u7eed\u67e5\u627e\u4e0b\u884c\u4e2d\u662f\u5426\u5b58\u5728\u4e0e\u6a21\u5f0f\u5339\u914d\u7684\u9879<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>var pattern_1 = \/ab+c\/i; \/\/\u5b57\u9762\u91cf\u5f62\u5f0f\nvar pattern_2 = new RegExp(\"ab+c\", \"i\"); \/\/ \u9996\u4e2a\u53c2\u6570\u4e3a\u5b57\u7b26\u4e32\u6a21\u5f0f\u7684\u6784\u9020\u51fd\u6570\nvar pattern_3 = new RegExp(\/ab+c\/, \"i\"); \/\/ \u9996\u4e2a\u53c2\u6570\u4e3a\u5e38\u89c4\u5b57\u9762\u91cf\u7684\u6784\u9020\u51fd\u6570\n<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>Date<\/code>\uff08\u65e5\u671f\uff09\n<ul class=\"wp-block-list\">\n<li><code>Date<\/code>\u7c7b\u578b\u662f\u5728\u65e9\u671fJava\u4e2d\u7684<code>java.util.Date<\/code>\u7c7b\u57fa\u7840\u4e0a\u6784\u5efa\u7684\u3002\u4e3a\u6b64<code>Date<\/code>\u7c7b\u578b\u4f7f\u7528\u6765\u81ea<code>UTC<\/code>\u65f6\u95f4\u76841970\u5e741\u67081\u65e50\u65f6\u5f00\u59cb\u7ecf\u8fc7\u7684\u6beb\u79d2\u6570\u6765\u4fdd\u5b58\u65e5\u671f<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>\/* \u521b\u5efa\u4e00\u4e2a\u65e5\u671f\u5bf9\u8c61 *\/\nvar now = new Date()<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">3.\u64cd\u4f5c\u7b26\u4e0e\u8bed\u53e5<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>JavaScript<\/code>\u4e2d\u5927\u90e8\u5206\u8bed\u53e5\u548c\u64cd\u4f5c\u7b26\u683c\u5f0f\u3001\u98ce\u683c\u3001\u4f7f\u7528\u65b9\u6cd5\u4e0e<code>C<\/code>\u8bed\u8a00\u76f8\u540c\uff0c\u5728\u6b64\u4ec5\u9488\u5bf9\u90e8\u5206\u8bb2\u89e3\uff0c\u5176\u4f59\u90e8\u5206\u4e0d\u505a\u8d58\u8ff0<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3.1 for-in\u8bed\u53e5<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>for\/in<\/code> \u8bed\u53e5\u5e38\u7528\u4e8e\u5faa\u73af\u904d\u5386\u5bf9\u8c61\u7684\u5c5e\u6027<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>var obj = { a: 1, b: 2, c: 3 };\n\nfor (var prop in obj) {\n    console.log(\"obj.\" + prop + \" = \" + obj&#91;prop]);\n}\n\/* \u8f93\u51fa\uff1a\n * \"obj.a = 1\"\n * \"obj.b = 2\"\n * \"obj.c = 3\"\n *\/ <\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">4. \u51fd\u6570\u8868\u8fbe\u5f0f<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">4.1 \u51fd\u6570\u521b\u5efa<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">4.1.1 \u51fd\u6570\u58f0\u660e\u548c\u51fd\u6570\u8868\u8fbe\u5f0f<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5b9a\u4e49\u51fd\u6570\u7684\u65b9\u5f0f\u6709\u51fd\u6570\u58f0\u660e\u3001\u51fd\u6570\u8868\u8fbe\u5f0f<\/li>\n\n\n\n<li>\u4f7f\u7528\u51fd\u6570\u8868\u8fbe\u5f0f\u521b\u5efa\u51fd\u6570\uff0c\u8fd9\u6837\u521b\u5efa\u7684\u51fd\u6570\u79f0\u4e3a\u533f\u540d\u51fd\u6570<\/li>\n\n\n\n<li>\u8fd9\u79cd\u65b9\u5f0f<code>function<\/code>\u5173\u952e\u5b57\u540e\u9762\u6ca1\u6709\u6807\u8bc6\u7b26\uff0c\u533f\u540d\u51fd\u6570\u7684<code>name<\/code>\u5c5e\u6027\u662f\u7a7a\u5b57\u7b26\u4e32<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>\/* \u4f7f\u7528\u4f7f\u7528function\u521b\u5efa\u51fd\u6570 *\/\nfunction functionName(arg0, arg1, arg2) {\n    \/\/\u51fd\u6570\u4f53\n}\n\n\/* \u4f7f\u7528\u51fd\u6570\u8868\u8fbe\u5f0f\u521b\u5efa\u51fd\u6570 *\/\nvar functionName = function (argo, argl, arg2) {\n    \/\/\u51fd\u6570\u4f53\n};<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">4.1.2 \u7bad\u5934\u51fd\u6570<\/h4>\n\n\n\n<p><code>ES6 <\/code>\u65b0\u589e\u4e86\u7bad\u5934\u51fd\u6570\uff0c\u7bad\u5934\u51fd\u6570\u8868\u8fbe\u5f0f\u7684\u8bed\u6cd5\u6bd4\u666e\u901a\u51fd\u6570\u8868\u8fbe\u5f0f\u66f4\u7b80\u6d01<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>(\u53c2\u65701, \u53c2\u65702, \u2026, \u53c2\u6570N) =&gt; { \u51fd\u6570\u58f0\u660e }\n\n(\u53c2\u65701, \u53c2\u65702, \u2026, \u53c2\u6570N) =&gt; \u8868\u8fbe\u5f0f(\u5355\u4e00)\n\/\/ \u76f8\u5f53\u4e8e\uff1a(\u53c2\u65701, \u53c2\u65702, \u2026, \u53c2\u6570N) =&gt;{ return \u8868\u8fbe\u5f0f; }<\/code><\/pre>\n\n\n\n<p>\u5f53\u53ea\u6709\u4e00\u4e2a\u53c2\u6570\u65f6\u5706\u62ec\u53f7\u662f\u53ef\u9009\u7684<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>(\u5355\u4e00\u53c2\u6570) =&gt; {\u51fd\u6570\u58f0\u660e}\n\u5355\u4e00\u53c2\u6570 =&gt; {\u51fd\u6570\u58f0\u660e}<\/code><\/pre>\n\n\n\n<p>\u6ca1\u6709\u53c2\u6570\u7684\u51fd\u6570\u5e94\u8be5\u5199\u6210\u4e00\u5bf9\u5706\u62ec\u53f7<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>() =&gt; {\u51fd\u6570\u58f0\u660e}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">4.2 \u95ed\u5305<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>JavaScript<\/code>\u4e2d\u5141\u8bb8\u5728\u4e00\u4e2a\u51fd\u6570\u4e2d\u5b9a\u4e49\u53e6\u4e00\u4e2a\u51fd\u6570\n<ul class=\"wp-block-list\">\n<li>\u5185\u90e8\u51fd\u6570\u53ef\u4ee5\u4f7f\u7528\u5916\u90e8\u51fd\u6570\u7684\u5c40\u90e8\u53d8\u91cf\uff0c\u5373\u4f7f\u8fd9\u4e2a\u5185\u90e8\u51fd\u6570\u88ab\u8fd4\u56de\u4e86\uff0c\u800c\u4e14\u662f\u5728\u5176\u4ed6\u5730\u65b9\u88ab\u8c03\u7528\u4e86\uff0c\u4f46\u4ed6\u4efb\u7136\u53ef\u4ee5\u8bbf\u95ee\u5916\u90e8\u51fd\u6570\u7684\u5c40\u90e8\u53d8\u91cf<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u6709\u6743\u8bbf\u95ee\u53e6\u4e00\u4e2a\u51fd\u6570\u4f5c\u7528\u57df\u4e2d\u7684\u53d8\u91cf\u7684\u51fd\u6570\u79f0\u4e3a\u95ed\u5305<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>function createCounter() {\n    let count = 0;\n\n    return function increment() {\n        count++;\n        console.log(count);\n    };\n}\n\nconst counter = createCounter();\n\ncounter(); \/\/ \u8f93\u51fa 1\ncounter(); \/\/ \u8f93\u51fa 2\ncounter(); \/\/ \u8f93\u51fa 3<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">5. \u53d8\u91cf\u3001\u4f5c\u7528\u57df\u548c\u5185\u5b58\u95ee\u9898<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">5.1 \u79c1\u6709\u53d8\u91cf<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4efb\u4f55\u5728\u51fd\u6570\u4e2d\u5b9a\u4e49\u7684\u53d8\u91cf\uff0c\u90fd\u53ef\u8ba4\u4e3a\u662f\u79c1\u6709\u53d8\u91cf\uff0c\u56e0\u4e3a\u4e0d\u80fd\u5728\u51fd\u6570\u5916\u90e8\u8bbf\u95ee\u8fd9\u4e9b\u53d8\u91cf\n<ul class=\"wp-block-list\">\n<li>\u79c1\u6709\u53d8\u91cf\u5305\u62ec\u51fd\u6570\u7684\u53c2\u6570\u3001\u5c40\u90e8\u53d8\u91cf\u548c\u5728\u51fd\u6570\u5185\u90e8\u5b9a\u4e49\u7684\u5176\u4ed6\u51fd\u6570\u3001<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u6211\u4eec\u628a\u6709\u6743\u8bbf\u95ee\u79c1\u6709\u53d8\u91cf\u548c\u79c1\u6709\u51fd\u6570\u7684\u516c\u6709\u65b9\u6cd5\u79f0\u4e3a\u7279\u6743\u65b9\u6cd5(<code>privileged method<\/code>)<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>function Myobject() {\n    \/\/\u79c1\u6709\u53d8\u91cf\u548c\u79c1\u6709\u51fd\u6570var privateVariable = 10;\n    function privateFunction() {\n        return false;\n    }\n    \/\/\u7279\u6743\u65b9\u6cd5\n    this.publicMethod = function () {\n        privateVariable++;\n        return privateFunction();\n    };\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">5.2 \u6267\u884c\u73af\u5883\u53ca\u4f5c\u7528\u57df<\/h3>\n\n\n\n<h3 class=\"wp-block-heading\">5.2.1 \u6267\u884c\u73af\u5883<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6267\u884c\u73af\u5883\u662f<code>JavaScript<\/code>\u4e2d\u7684\u6700\u91cd\u8981\u7684\u4e00\u4e2a\u6982\u5ff5\uff0c\u6267\u884c\u73af\u5883\u5b9a\u4e49\u4e86\u53d8\u91cf\u6216\u51fd\u6570\u6709\u6743\u8bbf\u95ee\u7684\u5176\u4ed6\u6570\u636e\uff1b\u6bcf\u4e2a\u6267\u884c\u73af\u5883\u90fd\u6709\u4e00\u4e2a\u4e0e\u4e4b\u5173\u8054\u7684\u53d8\u91cf\u5bf9\u8c61\uff0c\u73af\u5883\u4e2d\u5b9a\u4e49\u7684\u6240\u6709\u53d8\u91cf\u548c\u51fd\u6570\u90fd\u4fdd\u5b58\u5728\u8fd9\u4e2a\u5bf9\u8c61\u4e2d\uff0c\u89e3\u91ca\u5668\u5728\u5904\u7406\u6570\u636e\u65f6\u4f1a\u5728\u540e\u53f0\u4f7f\u7528\u5b83<\/li>\n\n\n\n<li>\u5728<code>web<\/code>\u6d4f\u89c8\u5668\u4e2d\uff0c\u5168\u5c40\u6267\u884c\u73af\u5883\u88ab\u8ba4\u4e3a\u662f<code>windows<\/code>\u5bf9\u8c61\uff0c\u56e0\u6b64\u6240\u6709\u5168\u5c40\u53d8\u91cf\u548c\u51fd\u6570\u90fd\u662f\u4f5c\u4e3a<code>windows<\/code>\u5bf9\u8c61\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u521b\u5efa\u7684<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">5.2.2 \u4f5c\u7528\u57df<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>JavaScript<\/code> \u7684\u4f5c\u7528\u57df\u5206\u4ee5\u4e0b\u4e09\u79cd\uff1a\n<ul class=\"wp-block-list\">\n<li>\u5168\u5c40\u4f5c\u7528\u57df\uff1a\u811a\u672c\u6a21\u5f0f\u8fd0\u884c\u6240\u6709\u4ee3\u7801\u7684\u9ed8\u8ba4\u4f5c\u7528\u57df<\/li>\n\n\n\n<li>\u6a21\u5757\u4f5c\u7528\u57df\uff1a\u6a21\u5757\u6a21\u5f0f\u4e2d\u8fd0\u884c\u4ee3\u7801\u7684\u4f5c\u7528\u57df<\/li>\n\n\n\n<li>\u51fd\u6570\u4f5c\u7528\u57df\uff1a\u7531\u51fd\u6570\u521b\u5efa\u7684\u4f5c\u7528\u57df<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u5728 <code>JavaScript<\/code> \u4e2d\uff0c<code>ES6<\/code>\uff08<code>ECMAScript 2015<\/code>\uff09\u5f15\u5165\u4e86\u5757\u7ea7\u4f5c\u7528\u57df\u7684\u6982\u5ff5\u3002\u5757\u7ea7\u4f5c\u7528\u57df\u610f\u5473\u7740\u53d8\u91cf\u548c\u51fd\u6570\u7684\u4f5c\u7528\u57df\u9650\u5b9a\u5728\u7531\u82b1\u62ec\u53f7 <code>{}<\/code> \u5305\u88f9\u7684\u4ee3\u7801\u5757\uff08\u4f8b\u5982\uff0c<code>if<\/code> \u8bed\u53e5\u3001<code>for<\/code> \u5faa\u73af\u7b49\uff09\u5185\u90e8\u3002\u5728 <code>ES6<\/code> \u4e4b\u524d\uff0c<code>JavaScript<\/code> \u53ea\u6709\u51fd\u6570\u4f5c\u7528\u57df\uff0c<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">5.3 \u5783\u573e\u56de\u6536<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>JavaScript<\/code>\u5177\u6709\u81ea\u52a8\u5783\u573e\u6536\u96c6\u673a\u5236\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u6267\u884c\u73af\u5883\u4f1a\u8d1f\u8d23\u7ba1\u7406\u4ee3\u7801\u6267\u884c\u8fc7\u7a0b\u4e2d\u4f7f\u7528\u7684\u5185\u5b58\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">5.3.1 \u6807\u8bb0\u6e05\u9664<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>JavaScript<\/code>\u4e2d\u6700\u5e38\u7528\u7684\u5783\u573e\u6536\u96c6\u65b9\u5f0f\u662f\u6807\u8bb0\u6e05\u9664<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">5.3.2 \u5f15\u7528\u8ba1\u6570<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u53e6\u4e00\u79cd\u5783\u573e\u56de\u6536\u7b56\u7565\u53eb\u505a\u5f15\u7528\u8ba1\u6570(<code>reference counting<\/code>)\u3002\u5f15\u7528\u8ba1\u6570\u662f\u6307\u8ddf\u8e2a\u8bb0\u5f55\u6bcf\u4e2a\u503c\u88ab\u5f15\u7528\u7684\u6b21\u6570\u3002\u5f53\u58f0\u660e\u4e86\u4e00\u4e2a\u53d8\u91cf\u5e76\u5c06\u4e00\u4e2a\u5f15\u7528\u7c7b\u578b\u503c\u8d4b\u7ed9\u8be5\u53d8\u91cf\u65f6\uff0c\u5219\u8fd9\u4e2a\u503c\u7684\u5f15\u7528\u6b21\u6570\u5c31\u662f<code>1<\/code>\u3002\u5982\u679c\u540c\u4e00\u4e2a\u503c\u53c8\u88ab\u8d4b\u7ed9\u53e6\u4e00\u4e2a\u53d8\u91cf\uff0c\u5219\u8be5\u503c\u7684\u5f15\u7528\u6b21\u6570\u52a0<code>1<\/code>\u3002\u76f8\u53cd\uff0c\u5982\u679c\u5305\u542b\u5bf9\u8fd9\u4e2a\u503c\u5f15\u7528\u7684\u53d8\u91cf\u53c8\u53d6\u5f97\u4e86\u53e6\u5916\u4e00\u4e2a\u503c\uff0c\u5219\u8fd9\u4e2a\u503c\u7684\u5f15\u7528\u6b21\u6570\u51cf<code>1<\/code>\u3002\u5f53\u8fd9\u4e2a\u503c\u7684\u5f15\u7528\u6b21\u6570\u53d8\u62100\u65f6\uff0c\u5219\u8bf4\u660e\u6ca1\u6709\u529e\u6cd5\u518d\u8bbf\u95ee\u8fd9\u4e2a\u503c\u4e86\uff0c\u56e0\u800c\u5c31\u53ef\u4ee5\u5c06\u5176\u5360\u7528\u7684\u5185\u5b58\u7a7a\u95f4\u56de\u6536\u56de\u6765\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u53c2\u8003\u6587\u6863\uff1a 1. \u5728HTML\u4e2d\u4f7f\u7528JavaScript 2.\u6570\u636e\u7c7b\u578b 2.1 \u57fa\u672c\u7c7b\u578b JavaScript\u4e2d 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