{"id":184,"date":"2026-01-24T11:04:00","date_gmt":"2026-01-24T03:04:00","guid":{"rendered":"https:\/\/mitongxue.cn\/?p=184"},"modified":"2026-06-04T11:22:05","modified_gmt":"2026-06-04T03:22:05","slug":"%e9%97%ad%e5%8c%85","status":"publish","type":"post","link":"https:\/\/mitongxue.cn\/index.php\/2026\/01\/24\/%e9%97%ad%e5%8c%85\/","title":{"rendered":"\u95ed\u5305"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">\u4ec0\u4e48\u662f\u95ed\u5305<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5176\u5b9e\u8981\u7406\u89e3 <em>JavaScript<\/em> \u4e2d\u7684\u95ed\u5305\uff0c\u975e\u5e38\u5bb9\u6613\uff0c\u4f46\u662f\u5728\u6b64\u4e4b\u524d\u4f60\u9700\u8981\u5148\u77e5\u9053\u4ee5\u4e0b\u4e24\u4e2a\u77e5\u8bc6\u70b9\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><em>JavaScript<\/em> \u4e2d\u7684\u4f5c\u7528\u57df\u548c\u4f5c\u7528\u57df\u94fe<\/li>\n\n\n\n<li><em>JavaScript<\/em> \u4e2d\u7684\u5783\u573e\u56de\u6536<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u91cc\u6211\u4eec\u6765\u7b80\u5355\u56de\u987e\u4e00\u4e0b\u8fd9\u4e24\u4e2a\u77e5\u8bc6\u70b9\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>1. <em>JavaScript<\/em> \u4e2d\u7684\u4f5c\u7528\u57df\u548c\u4f5c\u7528\u57df\u94fe<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f5c\u7528\u57df\u5c31\u662f\u4e00\u4e2a\u72ec\u7acb\u7684\u5730\u76d8\uff0c\u8ba9\u53d8\u91cf\u4e0d\u4f1a\u5916\u6cc4\u3001\u66b4\u9732\u51fa\u53bb\uff0c\u4e0d\u540c\u4f5c\u7528\u57df\u4e0b\u540c\u540d\u53d8\u91cf\u4e0d\u4f1a\u6709\u51b2\u7a81\u3002<\/li>\n\n\n\n<li>\u4f5c\u7528\u57df\u5728\u5b9a\u4e49\u65f6\u5c31\u786e\u5b9a\uff0c\u5e76\u4e14\u4e0d\u4f1a\u6539\u53d8\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u5728\u5f53\u524d\u4f5c\u7528\u57df\u4e2d\u6ca1\u6709\u67e5\u5230\u503c\uff0c\u5c31\u4f1a\u5411\u4e0a\u7ea7\u4f5c\u7528\u57df\u53bb\u67e5\uff0c\u76f4\u5230\u67e5\u5230\u5168\u5c40\u4f5c\u7528\u57df\uff0c\u8fd9\u4e48\u4e00\u4e2a\u67e5\u627e\u8fc7\u7a0b\u5f62\u6210\u7684\u94fe\u6761\u5c31\u53eb\u505a\u4f5c\u7528\u57df\u94fe\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>2. <em>JavaScript<\/em> \u4e2d\u7684\u5783\u573e\u56de\u6536<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><em>Javascript<\/em> \u6267\u884c\u73af\u5883\u4f1a\u8d1f\u8d23\u7ba1\u7406\u4ee3\u7801\u6267\u884c\u8fc7\u7a0b\u4e2d\u4f7f\u7528\u7684\u5185\u5b58\uff0c\u5176\u4e2d\u5c31\u6d89\u53ca\u5230\u4e00\u4e2a\u5783\u573e\u56de\u6536\u673a\u5236<\/li>\n\n\n\n<li>\u5783\u573e\u6536\u96c6\u5668\u4f1a\u5b9a\u671f\uff08\u5468\u671f\u6027\uff09\u627e\u51fa\u90a3\u4e9b\u4e0d\u518d\u7ee7\u7eed\u4f7f\u7528\u7684\u53d8\u91cf\uff0c\u53ea\u8981\u8be5\u53d8\u91cf\u4e0d\u518d\u4f7f\u7528\u4e86\uff0c\u5c31\u4f1a\u88ab\u5783\u573e\u6536\u96c6\u5668\u56de\u6536\uff0c\u7136\u540e\u91ca\u653e\u5176\u5185\u5b58\u3002\u5982\u679c\u8be5\u53d8\u91cf\u8fd8\u5728\u4f7f\u7528\uff0c\u90a3\u4e48\u5c31\u4e0d\u4f1a\u88ab\u56de\u6536\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><em>OK<\/em>\uff0c\u6709\u4e86\u8fd9 <em>2<\/em> \u4e2a\u77e5\u8bc6\u70b9\u7684\u94fa\u57ab\u540e\uff0c\u63a5\u4e0b\u6765\u6211\u4eec\u518d\u6765\u770b\u4ec0\u4e48\u662f\u95ed\u5305\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u95ed\u5305\u4e0d\u662f\u4e00\u4e2a\u5177\u4f53\u7684\u6280\u672f\uff0c\u800c\u662f\u4e00\u79cd\u73b0\u8c61\uff0c\u662f\u6307\u5728\u5b9a\u4e49\u51fd\u6570\u65f6\uff0c\u5468\u56f4\u73af\u5883\u4e2d\u7684\u4fe1\u606f\u53ef\u4ee5\u5728\u51fd\u6570\u4e2d\u4f7f\u7528\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u6267\u884c\u51fd\u6570\u65f6\uff0c\u53ea\u8981\u5728\u51fd\u6570\u4e2d\u4f7f\u7528\u4e86\u5916\u90e8\u7684\u6570\u636e\uff0c\u5c31\u521b\u5efa\u4e86\u95ed\u5305\u3002<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u800c\u4f5c\u7528\u57df\u94fe\uff0c\u6b63\u662f\u5b9e\u73b0\u95ed\u5305\u7684\u624b\u6bb5\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u53ea\u8981\u5728\u51fd\u6570\u4e2d\u4f7f\u7528\u4e86\u5916\u90e8\u7684\u6570\u636e\uff0c\u5c31\u521b\u5efa\u4e86\u95ed\u5305\u3002<\/h4>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"852\" height=\"308\" src=\"https:\/\/mitongxue.cn\/wp-content\/uploads\/2026\/06\/image-27.png\" alt=\"\" class=\"wp-image-185\" srcset=\"https:\/\/mitongxue.cn\/wp-content\/uploads\/2026\/06\/image-27.png 852w, https:\/\/mitongxue.cn\/wp-content\/uploads\/2026\/06\/image-27-300x108.png 300w, https:\/\/mitongxue.cn\/wp-content\/uploads\/2026\/06\/image-27-768x278.png 768w\" sizes=\"auto, (max-width: 852px) 100vw, 852px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u5c06\u58f0\u660e <em>i<\/em> \u8fd9\u4e2a\u53d8\u91cf\u7684\u52a8\u4f5c\u653e\u5230\u4e86 <em>a<\/em> \u51fd\u6570\u5916\u9762\uff0c\u4e5f\u5c31\u662f\u8bf4 <em>a<\/em> \u51fd\u6570\u5728\u81ea\u5df1\u7684\u4f5c\u7528\u57df\u5df2\u7ecf\u627e\u4e0d\u5230\u8fd9\u4e2a <em>i<\/em> \u53d8\u91cf\u4e86\uff0c\u5b83\u4f1a\u600e\u4e48\u529e\uff1f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b66\u4e60\u4e86\u4f5c\u7528\u57df\u94fe\u7684\u4f60\u80af\u5b9a\u77e5\u9053\uff0c\u5b83\u4f1a\u987a\u7740\u4f5c\u7528\u57df\u94fe\u4e00\u5c42\u4e00\u5c42\u5f80\u5916\u627e\u3002\u7136\u800c\u4e0a\u9762\u5728\u4ecb\u7ecd\u95ed\u5305\u65f6\u8bf4\u8fc7\uff0c\u5982\u679c\u51fa\u73b0\u4e86\u8fd9\u79cd\u60c5\u51b5\uff0c\u4e5f\u5c31\u662f\u51fd\u6570\u4f7f\u7528\u4e86\u5916\u90e8\u7684\u6570\u636e\u7684\u60c5\u51b5\uff0c\u5c31\u4f1a\u521b\u5efa\u95ed\u5305\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ed4\u7ec6\u89c2\u5bdf\u8c03\u8bd5\u533a\u57df\uff0c\u6211\u4eec\u4f1a\u53d1\u73b0\u6b64\u65f6\u7684 <em>i<\/em> \u5c31\u653e\u5728 <em>Closure<\/em> \u91cc\u9762\u7684\uff0c\u4ece\u800c\u8bc1\u5b9e\u4e86\u6211\u4eec\u524d\u9762\u7684\u8bf4\u6cd5\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u201c\u95ed\u201d\u53ef\u4ee5\u7406\u89e3\u4e3a\u201c\u5c01\u95ed\uff0c\u95ed\u73af\u201d\uff0c\u201c\u5305\u201d\u53ef\u4ee5\u7406\u89e3\u4e3a\u201c\u4e00\u4e2a\u7c7b\u4f3c\u4e8e\u5305\u88f9\u7684\u7a7a\u95f4\u201d\uff0c\u56e0\u6b64\u95ed\u5305\u5b9e\u9645\u4e0a\u53ef\u4ee5\u770b\u4f5c\u662f\u4e00\u4e2a\u5c01\u95ed\u7684\u7a7a\u95f4\uff0c\u90a3\u4e48\u8fd9\u4e2a\u7a7a\u95f4\u7528\u6765\u5e72\u5565\u5462\uff1f\u5b9e\u9645\u4e0a\u5c31\u662f\u7528\u6765\u5b58\u50a8\u53d8\u91cf\u7684\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u90a3\u4e48\u662f\u4e00\u4e2a\u51fd\u6570\u4e0b\u6240\u6709\u7684\u53d8\u91cf\u58f0\u660e\u90fd\u4f1a\u88ab\u653e\u5165\u5230\u95ed\u5305\u8fd9\u4e2a\u5c01\u95ed\u7684\u7a7a\u95f4\u91cc\u9762\u4e48\uff1f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5012\u4e5f\u4e0d\u662f\uff0c\u653e\u4e0d\u653e\u5165\u5230\u95ed\u5305\u4e2d\uff0c\u8981\u770b\u5176\u4ed6\u5730\u65b9\u6709\u6ca1\u6709\u5bf9\u8fd9\u4e2a\u53d8\u91cf\u8fdb\u884c\u5f15\u7528\uff0c\u4f8b\u5982\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"869\" height=\"437\" src=\"https:\/\/mitongxue.cn\/wp-content\/uploads\/2026\/06\/image-28.png\" alt=\"\" class=\"wp-image-186\" srcset=\"https:\/\/mitongxue.cn\/wp-content\/uploads\/2026\/06\/image-28.png 869w, https:\/\/mitongxue.cn\/wp-content\/uploads\/2026\/06\/image-28-300x151.png 300w, https:\/\/mitongxue.cn\/wp-content\/uploads\/2026\/06\/image-28-768x386.png 768w\" sizes=\"auto, (max-width: 869px) 100vw, 869px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u51fd\u6570 c \u4e2d\u4e00\u4e2a\u53d8\u91cf\u90fd\u6ca1\u6709\u521b\u5efa\uff0c\u5374\u8981\u6253\u5370 <em>i\u3001j\u3001k<\/em> \u548c <em>x<\/em>\uff0c\u8fd9\u4e9b\u53d8\u91cf\u5206\u522b\u5b58\u5728\u4e8e <em>a\u3001b<\/em> \u51fd\u6570\u4ee5\u53ca\u5168\u5c40\u4f5c\u7528\u57df\u4e2d\uff0c\u56e0\u6b64\u521b\u5efa\u4e86 <em>3<\/em> \u4e2a\u95ed\u5305\uff0c\u5168\u5c40\u95ed\u5305\u91cc\u9762\u5b58\u50a8\u4e86 <em>i<\/em> \u7684\u503c\uff0c\u95ed\u5305 <em>a<\/em> \u4e2d\u5b58\u50a8\u4e86\u53d8\u91cf <em>j<\/em> \u548c <em>k<\/em> \u7684\u503c\uff0c\u95ed\u5305 <em>b<\/em> \u4e2d\u5b58\u50a8\u4e86\u53d8\u91cf <em>x<\/em> \u7684\u503c\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f46\u662f\u4f60\u4ed4\u7ec6\u89c2\u5bdf\uff0c\u4f60\u5c31\u4f1a\u53d1\u73b0\u51fd\u6570 <em>b<\/em> \u4e2d\u7684 <em>y<\/em> \u53d8\u91cf\u5e76\u6ca1\u6709\u88ab\u653e\u5728\u95ed\u5305\u4e2d\uff0c\u6240\u4ee5\u8981\u4e0d\u8981\u653e\u5165\u95ed\u5305\u53d6\u51b3\u4e8e\u8be5\u53d8\u91cf\u6709\u6ca1\u6709\u88ab\u5f15\u7528\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u7136\uff0c\u6b64\u65f6\u7684\u4f60\u53ef\u80fd\u4f1a\u6709\u8fd9\u6837\u7684\u4e00\u4e2a\u65b0\u95ee\u9898\uff0c\u90a3\u4e48\u591a\u95ed\u5305\uff0c\u90a3\u5c82\u4e0d\u662f\u5360\u7528\u5185\u5b58\u7a7a\u95f4\u4e48\uff1f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b9e\u9645\u4e0a\uff0c\u5982\u679c\u662f\u81ea\u52a8\u5f62\u6210\u7684\u95ed\u5305\uff0c\u662f\u4f1a\u88ab\u9500\u6bc1\u6389\u7684\u3002\u4f8b\u5982\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"823\" height=\"504\" src=\"https:\/\/mitongxue.cn\/wp-content\/uploads\/2026\/06\/image-29.png\" alt=\"\" class=\"wp-image-187\" srcset=\"https:\/\/mitongxue.cn\/wp-content\/uploads\/2026\/06\/image-29.png 823w, https:\/\/mitongxue.cn\/wp-content\/uploads\/2026\/06\/image-29-300x184.png 300w, https:\/\/mitongxue.cn\/wp-content\/uploads\/2026\/06\/image-29-768x470.png 768w\" sizes=\"auto, (max-width: 823px) 100vw, 823px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u5728\u7b2c <em>16<\/em> \u884c\u5c1d\u8bd5\u6253\u5370\u8f93\u51fa\u53d8\u91cf <em>k<\/em>\uff0c\u663e\u7136\u8fd9\u4e2a\u65f6\u5019\u662f\u4f1a\u62a5\u9519\u7684\uff0c\u5728\u7b2c <em>16<\/em> \u884c\u6253\u4e00\u4e2a\u65ad\u70b9\u8c03\u8bd5\u5c31\u53ef\u4ee5\u6e05\u695a\u7684\u770b\u5230\uff0c\u6b64\u65f6\u5df2\u7ecf\u6ca1\u6709\u4efb\u4f55\u95ed\u5305\u5b58\u5728\uff0c\u5783\u573e\u56de\u6536\u5668\u4f1a\u81ea\u52a8\u56de\u6536\u6ca1\u6709\u5f15\u7528\u7684\u53d8\u91cf\uff0c\u4e0d\u4f1a\u6709\u4efb\u4f55\u5185\u5b58\u5360\u7528\u7684\u60c5\u51b5\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u7136\uff0c\u8fd9\u91cc\u6211\u6307\u7684\u662f\u81ea\u52a8\u4ea7\u751f\u95ed\u5305\u7684\u60c5\u51b5\uff0c\u5173\u4e8e\u95ed\u5305\uff0c\u6709\u65f6\u6211\u4eec\u9700\u8981\u6839\u636e\u9700\u6c42\u624b\u52a8\u7684\u6765\u5236\u9020\u4e00\u4e2a\u95ed\u5305\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>function eat(){\n    var food = \"\u9e21\u7fc5\";\n    console.log(food);\n}\neat(); \/\/ \u9e21\u7fc5\nconsole.log(food); \/\/ \u62a5\u9519<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u58f0\u660e\u4e86\u4e00\u4e2a\u540d\u4e3a <em>eat<\/em> \u7684\u51fd\u6570\uff0c\u5e76\u5bf9\u5b83\u8fdb\u884c\u8c03\u7528\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>JavaScript<\/em> \u5f15\u64ce\u4f1a\u521b\u5efa\u4e00\u4e2a <em>eat<\/em> \u51fd\u6570\u7684\u6267\u884c\u4e0a\u4e0b\u6587\uff0c\u5176\u4e2d\u58f0\u660e <em>food<\/em> \u53d8\u91cf\u5e76\u8d4b\u503c\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u8be5\u65b9\u6cd5\u6267\u884c\u5b8c\u540e\uff0c\u4e0a\u4e0b\u6587\u88ab\u9500\u6bc1\uff0c<em>food<\/em> \u53d8\u91cf\u4e5f\u4f1a\u8ddf\u7740\u6d88\u5931\u3002\u8fd9\u662f\u56e0\u4e3a <em>food<\/em> \u53d8\u91cf\u5c5e\u4e8e <em>eat<\/em> \u51fd\u6570\u7684\u5c40\u90e8\u53d8\u91cf\uff0c\u5b83\u4f5c\u7528\u4e8e <em>eat<\/em> \u51fd\u6570\u4e2d\uff0c\u4f1a\u968f\u7740 <em>eat<\/em> \u7684\u6267\u884c\u4e0a\u4e0b\u6587\u521b\u5efa\u800c\u521b\u5efa\uff0c\u9500\u6bc1\u800c\u9500\u6bc1\u3002\u6240\u4ee5\u5f53\u6211\u4eec\u518d\u6b21\u6253\u5370 <em>food<\/em> \u53d8\u91cf\u65f6\uff0c\u5c31\u4f1a\u62a5\u9519\uff0c\u544a\u8bc9\u6211\u4eec\u8be5\u53d8\u91cf\u4e0d\u5b58\u5728\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>function eat(){\n    var food = '\u9e21\u7fc5';\n    return function(){\n        console.log(food);\n    }\n}\nvar look = eat();\nlook(); \/\/ \u9e21\u7fc5\nlook(); \/\/ \u9e21\u7fc5<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c<em>eat<\/em> \u51fd\u6570\u8fd4\u56de\u4e00\u4e2a\u51fd\u6570\uff0c\u5e76\u5728\u8fd9\u4e2a\u5185\u90e8\u51fd\u6570\u4e2d\u8bbf\u95ee <em>food<\/em> \u8fd9\u4e2a\u5c40\u90e8\u53d8\u91cf\u3002\u8c03\u7528 <em>eat<\/em> \u51fd\u6570\u5e76\u5c06\u7ed3\u679c\u8d4b\u7ed9 <em>look<\/em> \u53d8\u91cf\uff0c\u8fd9\u4e2a <em>look<\/em> \u6307\u5411\u4e86 <em>eat<\/em> \u51fd\u6570\u4e2d\u7684\u5185\u90e8\u51fd\u6570\uff0c\u7136\u540e\u8c03\u7528\u5b83\uff0c\u6700\u7ec8\u8f93\u51fa <em>food<\/em> \u7684\u503c\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e3a\u4ec0\u4e48\u80fd\u8bbf\u95ee\u5230 <em>food<\/em>\uff0c\u539f\u56e0\u5f88\u7b80\u5355\uff0c\u4e0a\u9762\u6211\u4eec\u8bf4\u8fc7\uff0c\u5783\u573e\u56de\u6536\u5668\u53ea\u4f1a\u56de\u6536\u6ca1\u6709\u88ab\u5f15\u7528\u5230\u7684\u53d8\u91cf\uff0c\u4f46\u662f\u4e00\u65e6\u4e00\u4e2a\u53d8\u91cf\u8fd8\u88ab\u5f15\u7528\u7740\u7684\uff0c\u5783\u573e\u56de\u6536\u5668\u5c31\u4e0d\u4f1a\u56de\u6536\u6b64\u53d8\u91cf\u3002\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u7167\u7406\u8bf4 <em>eat<\/em> \u8c03\u7528\u5b8c\u6bd5 <em>food<\/em> \u5c31\u5e94\u8be5\u88ab\u9500\u6bc1\u6389\uff0c\u4f46\u662f\u6211\u4eec\u5411\u5916\u90e8\u8fd4\u56de\u4e86 <em>eat<\/em> \u5185\u90e8\u7684\u533f\u540d\u51fd\u6570\uff0c\u800c\u8fd9\u4e2a\u533f\u540d\u51fd\u6570\u6709\u5f15\u7528\u4e86 <em>food<\/em>\uff0c\u6240\u4ee5\u5783\u573e\u56de\u6536\u5668\u662f\u4e0d\u4f1a\u5bf9\u5176\u8fdb\u884c\u56de\u6536\u7684\uff0c\u8fd9\u4e5f\u662f\u4e3a\u4ec0\u4e48\u5728\u5916\u9762\u8c03\u7528\u8fd9\u4e2a\u533f\u540d\u51fd\u6570\u65f6\uff0c\u4ecd\u7136\u80fd\u591f\u6253\u5370\u51fa <em>food<\/em> \u53d8\u91cf\u7684\u503c\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u81f3\u6b64\uff0c\u95ed\u5305\u7684\u4e00\u4e2a\u4f18\u70b9\u6216\u8005\u7279\u70b9\u4e5f\u5c31\u4f53\u73b0\u51fa\u6765\u4e86\uff0c\u90a3\u5c31\u662f\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u901a\u8fc7\u95ed\u5305\u53ef\u4ee5\u8ba9\u5916\u90e8\u73af\u5883\u8bbf\u95ee\u5230\u51fd\u6570\u5185\u90e8\u7684\u5c40\u90e8\u53d8\u91cf\u3002<\/li>\n\n\n\n<li>\u901a\u8fc7\u95ed\u5305\u53ef\u4ee5\u8ba9\u5c40\u90e8\u53d8\u91cf\u6301\u7eed\u4fdd\u5b58\u4e0b\u6765\uff0c\u4e0d\u968f\u7740\u5b83\u7684\u4e0a\u4e0b\u6587\u73af\u5883\u4e00\u8d77\u9500\u6bc1\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u901a\u8fc7\u6b64\u7279\u6027\uff0c\u6211\u4eec\u53ef\u4ee5\u89e3\u51b3\u4e00\u4e2a\u5168\u5c40\u53d8\u91cf\u6c61\u67d3\u7684\u95ee\u9898\u3002\u65e9\u671f\u5728 <em>JavaScript<\/em> \u8fd8\u65e0\u6cd5\u8fdb\u884c\u6a21\u5757\u5316\u7684\u65f6\u5019\uff0c\u5728\u591a\u4eba\u534f\u4f5c\u65f6\uff0c\u5982\u679c\u5b9a\u4e49\u8fc7\u591a\u7684\u5168\u5c40\u53d8\u91cf \u6709\u53ef\u80fd\u9020\u6210\u5168\u5c40\u53d8\u91cf\u547d\u540d\u51b2\u7a81\uff0c\u4f7f\u7528\u95ed\u5305\u6765\u89e3\u51b3\u529f\u80fd\u5bf9\u53d8\u91cf\u7684\u8c03\u7528\u5c06\u53d8\u91cf\u5199\u5230\u4e00\u4e2a\u72ec\u7acb\u7684\u7a7a\u95f4\u91cc\u9762\uff0c\u4ece\u800c\u80fd\u591f\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u89e3\u51b3\u5168\u5c40\u53d8\u91cf\u6c61\u67d3\u7684\u95ee\u9898\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var name = \"GlobalName\";\n\/\/ \u5168\u5c40\u53d8\u91cf\nvar init = (function () {\n    var name = \"initName\";\n    function callName() {\n        console.log(name);\n        \/\/ \u6253\u5370 name\n    }\n    return function () {\n        callName();\n        \/\/ \u5f62\u6210\u63a5\u53e3\n    }\n}());\ninit(); \/\/ initName\nvar initSuper = (function () {\n    var name = \"initSuperName\";\n    function callName() {\n        console.log(name);\n        \/\/ \u6253\u5370 name\n    }\n    return function () {\n        callName();\n        \/\/ \u5f62\u6210\u63a5\u53e3\n    }\n}());\ninitSuper(); \/\/ initSuperName<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u95ed\u5305\u662f\u4e00\u4e2a\u5c01\u95ed\u7684\u7a7a\u95f4\uff0c\u91cc\u9762\u5b58\u50a8\u4e86\u5728\u5176\u4ed6\u5730\u65b9\u4f1a\u5f15\u7528\u5230\u7684\u8be5\u4f5c\u7528\u57df\u7684\u503c\uff0c\u5728 <em>JavaScript<\/em> \u4e2d\u662f\u901a\u8fc7\u4f5c\u7528\u57df\u94fe\u6765\u5b9e\u73b0\u7684\u95ed\u5305\u3002<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u53ea\u8981\u5728\u51fd\u6570\u4e2d\u4f7f\u7528\u4e86\u5916\u90e8\u7684\u6570\u636e\uff0c\u5c31\u521b\u5efa\u4e86\u95ed\u5305\uff0c\u8fd9\u79cd\u60c5\u51b5\u4e0b\u6240\u521b\u5efa\u7684\u95ed\u5305\uff0c\u6211\u4eec\u5728\u7f16\u7801\u65f6\u662f\u4e0d\u9700\u8981\u53bb\u5173\u5fc3\u7684\u3002<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6211\u4eec\u8fd8\u53ef\u4ee5\u901a\u8fc7\u4e00\u4e9b\u624b\u6bb5\u624b\u52a8\u521b\u5efa\u95ed\u5305\uff0c\u4ece\u800c\u8ba9\u5916\u90e8\u73af\u5883\u8bbf\u95ee\u5230\u51fd\u6570\u5185\u90e8\u7684\u5c40\u90e8\u53d8\u91cf\uff0c\u8ba9\u5c40\u90e8\u53d8\u91cf\u6301\u7eed\u4fdd\u5b58\u4e0b\u6765\uff0c\u4e0d\u968f\u7740\u5b83\u7684\u4e0a\u4e0b\u6587\u73af\u5883\u4e00\u8d77\u9500\u6bc1\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u95ed\u5305\u7ecf\u5178\u95ee\u9898<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>for (var i = 1; i &lt;= 3; i++) {\n    setTimeout(function () {\n        console.log(i);\n    }, 1000);\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u9884\u671f\u7684\u7ed3\u679c\u662f\u8fc7 <em>1<\/em> \u79d2\u540e\u5206\u522b\u8f93\u51fa <em>i<\/em> \u53d8\u91cf\u7684\u503c\u4e3a <em>1\uff0c2\uff0c3<\/em>\u3002\u4f46\u662f\uff0c\u6267\u884c\u7684\u7ed3\u679c\u662f\uff1a<em>4\uff0c4\uff0c4<\/em>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b9e\u9645\u4e0a\uff0c\u95ee\u9898\u5c31\u51fa\u5728\u95ed\u5305\u8eab\u4e0a\u3002\u4f60\u770b\uff0c\u5faa\u73af\u4e2d\u7684 <em>setTimeout<\/em> \u8bbf\u95ee\u4e86\u5b83\u7684\u5916\u90e8\u53d8\u91cf <em>i<\/em>\uff0c\u5f62\u6210\u95ed\u5305\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u800c <em>i<\/em> \u53d8\u91cf\u53ea\u6709 <em>1<\/em> \u4e2a\uff0c\u6240\u4ee5\u5faa\u73af <em>3<\/em> \u6b21\u7684 <em>setTimeout<\/em> \u4e2d\u90fd\u8bbf\u95ee\u7684\u662f\u540c\u4e00\u4e2a\u53d8\u91cf\u3002\u5faa\u73af\u5230\u7b2c <em>4<\/em> \u6b21\uff0c<em>i<\/em> \u53d8\u91cf\u589e\u52a0\u5230 <em>4<\/em>\uff0c\u4e0d\u6ee1\u8db3\u5faa\u73af\u6761\u4ef6\uff0c\u5faa\u73af\u7ed3\u675f\uff0c\u4ee3\u7801\u6267\u884c\u5b8c\u540e\u4e0a\u4e0b\u6587\u7ed3\u675f\u3002\u4f46\u662f\uff0c\u90a3 <em>3<\/em> \u4e2a <em>setTimeout<\/em> \u7b49 <em>1<\/em> \u79d2\u949f\u540e\u624d\u6267\u884c\uff0c\u7531\u4e8e\u95ed\u5305\u7684\u539f\u56e0\uff0c\u6240\u4ee5\u5b83\u4eec\u4ecd\u7136\u80fd\u8bbf\u95ee\u5230\u53d8\u91cf <em>i<\/em>\uff0c\u4e0d\u8fc7\u6b64\u65f6 <em>i<\/em> \u53d8\u91cf\u503c\u5df2\u7ecf\u662f <em>4<\/em> \u4e86\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8981\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u53ef\u4ee5\u8ba9 <em>setTimeout<\/em> \u4e2d\u7684\u533f\u540d\u51fd\u6570\u4e0d\u518d\u8bbf\u95ee\u5916\u90e8\u53d8\u91cf\uff0c\u800c\u662f\u8bbf\u95ee\u81ea\u5df1\u5185\u90e8\u7684\u53d8\u91cf\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>for (var i = 1; i &lt;= 3; i++) {\n    (function (index) {\n        setTimeout(function () {\n            console.log(index);\n        }, 1000);\n    })(i)\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u6837 <em>setTimeout<\/em> \u4e2d\u5c31\u53ef\u4ee5\u4e0d\u7528\u8bbf\u95ee <em>for<\/em> \u5faa\u73af\u58f0\u660e\u7684\u53d8\u91cf <em>i<\/em> \u4e86\u3002\u800c\u662f\u91c7\u7528\u8c03\u7528\u51fd\u6570\u4f20\u53c2\u7684\u65b9\u5f0f\u628a\u53d8\u91cf <em>i<\/em> \u7684\u503c\u4f20\u7ed9\u4e86 <em>setTimeout<\/em>\uff0c\u8fd9\u6837\u5b83\u4eec\u5c31\u4e0d\u518d\u521b\u5efa\u95ed\u5305\uff0c\u56e0\u4e3a\u5728\u6211\u81ea\u5df1\u7684\u4f5c\u7528\u57df\u91cc\u9762\u80fd\u591f\u627e\u5230 <em>i<\/em> \u8fd9\u4e2a\u53d8\u91cf\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u7136\uff0c\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u8fd8\u6709\u4e2a\u66f4\u7b80\u5355\u7684\u65b9\u6cd5\uff0c\u5c31\u662f\u4f7f\u7528 <em>ES6<\/em> \u4e2d\u7684 <em>let<\/em> \u5173\u952e\u5b57\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b83\u58f0\u660e\u7684\u53d8\u91cf\u6709\u5757\u4f5c\u7528\u57df\uff0c\u5982\u679c\u5c06\u5b83\u653e\u5728\u5faa\u73af\u4e2d\uff0c\u90a3\u4e48\u6bcf\u6b21\u5faa\u73af\u90fd\u4f1a\u6709\u4e00\u4e2a\u65b0\u7684\u53d8\u91cf <em>i<\/em>\uff0c\u8fd9\u6837\u5373\u4f7f\u6709\u95ed\u5305\u4e5f\u6ca1\u95ee\u9898\uff0c\u56e0\u4e3a\u6bcf\u4e2a\u95ed\u5305\u4fdd\u5b58\u7684\u90fd\u662f\u4e0d\u540c\u7684 <em>i<\/em> \u53d8\u91cf\uff0c\u90a3\u4e48\u521a\u624d\u7684\u95ee\u9898\u4e5f\u5c31\u8fce\u5203\u800c\u89e3\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>for (let i = 1; i &lt;= 3; i++) {\n    setTimeout(function () {\n        console.log(i);\n    }, 1000);\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4ec0\u4e48\u662f\u95ed\u5305 \u5176\u5b9e\u8981\u7406\u89e3 JavaScript \u4e2d\u7684..<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16,11],"tags":[],"class_list":["post-184","post","type-post","status-publish","format-standard","hentry","category-js","category-front"],"featured_image_urls":{"full":"","thumbnail":"","medium":"","medium_large":"","large":"","1536x1536":"","2048x2048":""},"author_info":{"info":["\u9648 \u67d0\u4eba"]},"category_info":"<a href=\"https:\/\/mitongxue.cn\/index.php\/category\/front\/js\/\" rel=\"category tag\">JS<\/a> <a href=\"https:\/\/mitongxue.cn\/index.php\/category\/front\/\" rel=\"category tag\">\u524d\u7aef<\/a>","tag_info":"\u524d\u7aef","comment_count":"0","_links":{"self":[{"href":"https:\/\/mitongxue.cn\/index.php\/wp-json\/wp\/v2\/posts\/184","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mitongxue.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mitongxue.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mitongxue.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mitongxue.cn\/index.php\/wp-json\/wp\/v2\/comments?post=184"}],"version-history":[{"count":1,"href":"https:\/\/mitongxue.cn\/index.php\/wp-json\/wp\/v2\/posts\/184\/revisions"}],"predecessor-version":[{"id":188,"href":"https:\/\/mitongxue.cn\/index.php\/wp-json\/wp\/v2\/posts\/184\/revisions\/188"}],"wp:attachment":[{"href":"https:\/\/mitongxue.cn\/index.php\/wp-json\/wp\/v2\/media?parent=184"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mitongxue.cn\/index.php\/wp-json\/wp\/v2\/categories?post=184"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mitongxue.cn\/index.php\/wp-json\/wp\/v2\/tags?post=184"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}