{"id":64,"date":"2020-10-30T21:07:21","date_gmt":"2020-10-30T13:07:21","guid":{"rendered":"http:\/\/qqiuklele.cn\/?p=64"},"modified":"2025-03-26T15:20:57","modified_gmt":"2025-03-26T07:20:57","slug":"%e8%b0%88%e4%b8%80%e8%b0%88javascript%e6%89%a7%e8%a1%8c%e6%9c%ba%e5%88%b6","status":"publish","type":"post","link":"https:\/\/qqiukulele.cn\/?p=64","title":{"rendered":"\u8c08\u4e00\u8c08JavaScript\u6267\u884c\u673a\u5236"},"content":{"rendered":"\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u5173\u952e\u5b57\uff1a\u540c\u6b65\u6267\u884c\u3001\u5f02\u6b65\u6267\u884c\u3001\u4e8b\u4ef6\u5faa\u73af\u3001\u5b8f\u4efb\u52a1\u3001\u5fae\u4efb\u52a1\u3001\u961f\u5217<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">\u524d\u8a00<\/h2>\n\n\n\n<p>\u9996\u5148\uff0c\u770b\u4e00\u6bb5\u6709\u5173\u5f02\u6b65\u6267\u884c\u7684\u4e00\u6bb5\u4ee3\u7801\uff0c\u60f3\u4e00\u60f3\u5b83\u4f1a\u8f93\u51fa\u4ec0\u4e48\uff1f<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/\u600e\u4e48\u4e2a\u6253\u5370\u987a\u5e8f\u5462\uff1f\nsetTimeout(()=&gt;{                                                               \n    console.log(\"ssssss\")\n}\uff0c0);\n\nnew Promise((resolve,reject)=&gt;{\n    console.log(\"\u600e\u4e48\u4e5f\u98de\u4e0d\u51fa\")\n    resolve();                                                               \n}).then(()=&gt;{\n    console.log(\"\u82b1\u82b1\u7684\u4e16\u754c\")                                                 \n});\n\nconsole.log(\"\u666e\u666e\u901a\u901a\u5c0f\u8f93\u51fa\");\n<\/code><\/pre>\n\n\n\n<p>\u5176\u5b9e\u6211\u521a\u5f00\u59cb\u5b66\u5f02\u6b65\u7684\u65f6\u5019\uff0c\u53ea\u77e5\u9053\u5f02\u6b65\u7684\u4f5c\u7528\u662f\u4e3a\u4e86\u51cf\u5c11\u963b\u585e\u6267\u884c\u7ebf\u7a0b\u7684\u60c5\u51b5\u3002\u4f46\u662f\u5f53\u6211\u770b\u5230\u4e0a\u9762\u8fd9\u79cd\u4ee3\u7801\u7684\u65f6\u5019\uff0c\u6211\u5c31\u4e00\u76f4\u60f3\u5230\u5e95\u662f\u8c01\u5148\u8f93\u51fa\u5462\uff1f\u7136\u540e\u5c31\u5927\u8111\u4e00\u7247\u7a7a\u767d\u3002\u6211\u56de\u5934\u5355\u7eaf\u590d\u4e60setTimeout\u3001Promise\uff0c\u4e5f\u4e0d\u80fd\u505a\u5230\u5f88\u8bf4\u670d\u81ea\u5df1\u7684\u7406\u89e3\u3002\u4f46\u662f\u5f53\u6211\u5b66\u4e60\u548c\u7406\u89e3\u4e86JavaScript\u7684\u6267\u884c\u673a\u5236\u540e\uff0c\u8fd9\u6bb5\u4ee3\u7801\u770b\u8d77\u6765\uff0c\u5c31\u53d8\u5f97\u5f88\u8f7b\u677e\u4e86\u3002\u6240\u4ee5\u6211\u603b\u7ed3\u4e86\u4e00\u4e0bJavaScript\u7684\u8fd0\u884c\u673a\u5236\uff0c\u7ed3\u5408\u4e86\u6211\u4e2a\u4eba\u7684\u7406\u89e3\uff0c\u5e0c\u671b\u5bf9\u4f60\u6709\u5e2e\u52a9\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u540c\u6b65\u4e0e\u5f02\u6b65<\/h2>\n\n\n\n<p>\u8c08\u4e00\u8c08JavaScript\u7684\u6267\u884c\u673a\u5236\uff0c\u6211\u4eec\u4e5f\u8981\u4e86\u89e3\u540c\u6b65\u548c\u5f02\u6b65\u7f16\u7a0b\uff0c\u60f3\u4e00\u60f3\u4e3a\u4ec0\u4e48\u6211\u4eec\u9700\u8981\u5f02\u6b65\u7f16\u7a0b\u3002<\/p>\n\n\n\n<p>\u9996\u5148\uff0c<strong>JavaScript\u662f\u5355\u7ebf\u7a0b\u7684<\/strong>\u3002JS\u4ee3\u7801\u9996\u6b21\u8fd0\u884c\uff0c\u90fd\u4f1a\u5148\u521b\u5efa\u4e00\u4e2a\u5168\u5c40\u6267\u884c\u4e0a\u4e0b\u6587\u5e76\u538b\u5165\u5230\u6267\u884c\u6808\u4e2d\uff0c\u4e4b\u540e\u6bcf\u5f53\u6709\u51fd\u6570\u88ab\u8c03\u7528\uff0c\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u51fd\u6570\u6267\u884c\u4e0a\u4e0b\u6587\u5e76\u538b\u5165\u6808\u5185\uff0c\u4e14\u8fd9\u4e2a\u6267\u884c\u6808\u5177\u6709LIFO\uff08Last In First Out\u540e\u8fdb\u5148\u51fa\uff0c\u4e5f\u5c31\u662f\u5148\u8fdb\u540e\u51fa\uff09\u7684\u7279\u6027\u3002<\/p>\n\n\n\n<p>\u901a\u4fd7\u660e\u767d\u5730\u8bf4\uff0c\u6d4f\u89c8\u5668\u5bf9\u58f0\u660e\u8bed\u53e5\u8fdb\u884c\u9884\u5904\u7406\u540e\uff0c\u6267\u884cJavaScript\u65f6\uff0c\u4ee3\u7801\u4f1a\u4ece\u4e0a\u5230\u4e0b\u6309\u987a\u5e8f\u6267\u884c\u903b\u8f91\u64cd\u4f5c\u548c\u51fd\u6570\u7684\u8c03\u7528\u3002\u8fd9\u5c31\u662f<strong>\u540c\u6b65<\/strong>\u3002\u53ef\u4ee5\u60f3\u8c61\uff0c\u5f53\u67d0\u4e2a\u4e8b\u4ef6\u5904\u7406\u7684\u8ba1\u7b97\u91cf\u5f88\u5927\u6216\u8005\u7b49\u5f85\u670d\u52a1\u5668\u54cd\u5e94\u7684\u65f6\u95f4\u8fc7\u957f\uff0c\u5c31\u4f1a\u5bfc\u81f4\u540e\u9762\u7684\u4ee3\u7801\u6ca1\u6709\u529e\u6cd5\u6267\u884c\uff0c\u9875\u9762\u4e5f\u53ef\u80fd\u4e00\u76f4\u5904\u4e8e\u4e00\u79cd\u5047\u6b7b\u72b6\u6001\u3002\u8fd9\u6837\u5bf9\u4f7f\u7528\u8005\u6765\u8bf4\u5c31\u5f88\u4e0d\u723d\u3002<\/p>\n\n\n\n<p>\u5f02\u6b65\u7f16\u7a0b\u7684\u4ea7\u751f\u5c31\u5141\u8bb8\u4e86<strong>\u8bb8\u591a\u8f93\u5165\/\u8f93\u51fa\u64cd\u4f5c\u53ef\u4ee5\u540c\u65f6\u53d1\u751f<\/strong>\u3002\u5bf9\u4e8eJavaScript\uff0c\u53ef\u4ee5\u901a\u8fc7<em>\u4e8b\u4ef6\u5faa\u73af<\/em>\u3001<em>\u8c03\u7528\u5806\u6808<\/em>\u548c<em>\u5f02\u6b65API<\/em>\u6765\u5b9e\u73b0\u5f02\u6b65\u7f16\u7a0b\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8b\u4ef6\u5faa\u73af\uff1a\u5fae\u4efb\u52a1\u548c\u5b8f\u4efb\u52a1<\/h2>\n\n\n\n<p><strong>\u4e8b\u4ef6\u5faa\u73af\u662fJavaScript\u7684\u8fd0\u884c\u673a\u5236\u3002<\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u4e8b\u4ef6\u5faa\u73af\u7684\u6982\u5ff5\u975e\u5e38\u7b80\u5355\u3002\u5b83\u662f\u4e00\u4e2a\u5728 JavaScript \u5f15\u64ce\u7b49\u5f85\u4efb\u52a1\uff0c\u6267\u884c\u4efb\u52a1\u548c\u8fdb\u5165\u4f11\u7720\u72b6\u6001\u7b49\u5f85\u66f4\u591a\u4efb\u52a1\u8fd9\u51e0\u4e2a\u72b6\u6001\u4e4b\u95f4\u8f6c\u6362\u7684\u65e0\u9650\u5faa\u73af\u3002<\/p>\n<\/blockquote>\n\n\n\n<h4 class=\"wp-block-heading\">\u4e3e\u4e00\u4e2a\u996d\u5802\u70b9\u9910\u4f8b\u5b50\u6765\u7406\u89e3\u4e8b\u4ef6\u5faa\u73af<\/h4>\n\n\n\n<p>\u6211\u7406\u89e3\u7684\u4e8b\u4ef6\u5faa\u73af \u2014\u2014 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class=\"wp-block-heading\">JS\u91cc\u7684\u4e8b\u4ef6\u5faa\u73af\u7684\u6d41\u7a0b<\/h4>\n\n\n\n<p>\u518d\u770b\u56de\u4e0a\u9762\u7684\u4e8b\u4ef6\u5faa\u73af\u5b9a\u4e49\uff0c\u4e8b\u4ef6\u5faa\u73af\u7684\u6982\u5ff5\u5c31\u771f\u7684\u5f88\u7b80\u5355\u4e86\u2570(\uffe3\u03c9\uffe3\uff4f)\u3002<\/p>\n\n\n\n<p>JS\u5f15\u64ce\u5e38\u9a7b\u4e8e\u5185\u5b58\u4e2d\uff0c\u7b49\u5f85\u5bbf\u4e3b\u5c06JS\u4ee3\u7801\u6216\u51fd\u6570\u4f20\u9012\u7ed9\u5b83\uff0c\u4e5f\u5c31\u662f\u7b49\u5f85<strong>\u5bbf\u4e3b\u73af\u5883\u5206\u914d\u5b8f\u89c2\u4efb\u52a1\uff0c\u53cd\u590d\u7b49\u5f85 &#8211; \u6267\u884c<\/strong>\u5373\u4e3a\u4e8b\u4ef6\u5faa\u73af\uff08Event Loop\uff09\u3002<\/p>\n\n\n\n<p>Event Loop\u4e2d\uff0c\u6bcf\u4e00\u6b21\u5faa\u73af\u79f0\u4e3atick\uff0c\u6bcf\u4e00\u6b21tick\u7684\u4efb\u52a1\u5982\u4e0b\uff1a 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promise \u521b\u5efa\u7684\uff1a\u5bf9 <code>.then\/catch\/finally<\/code> \u5904\u7406\u7a0b\u5e8f\u7684\u6267\u884c\u4f1a\u6210\u4e3a\u5fae\u4efb\u52a1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<p>\u90a3\u6574\u4f53\u6765\u770b\uff0cJS\u7684\u4e8b\u4ef6\u5faa\u73af\u673a\u5236\u5982\u4e0b\u56fe\u6240\u793a?\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/qqiukulele.cn\/wp-content\/uploads\/2020\/10\/1.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"770\" height=\"726\" data-original=\"http:\/\/qqiukulele.cn\/wp-content\/uploads\/2020\/10\/1.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-476\"  sizes=\"auto, (max-width: 770px) 100vw, 770px\" \/><\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u5f00\u5934\u4ee3\u7801\u7684\u8f93\u51fa\u7ed3\u679c\u5206\u6790<\/h2>\n\n\n\n<p>\u7ed3\u5408\u4e0a\u9762\u89e3\u91ca\u7684JavaScript\u6267\u884c\u7684\u8fd0\u884c\u673a\u5236\u548c\u5b8f\u4efb\u52a1\u4e0e\u5fae\u4efb\u52a1\u7684\u5177\u4f53\u4e8b\u4ef6\u5206\u7c7b\uff0c\u6211\u5c31\u53ef\u4ee5\u5206\u6790\u51fa\u6700\u524d\u9762\u7ed9\u51fa\u7684\u4ee3\u7801\u7684\u6267\u884c\u6d41\u7a0b\u3002<\/p>\n\n\n\n<ul style=\"color:#1d1e1f;background-color:#b2d4e9\" class=\"wp-block-list has-text-color has-background\">\n<li>\u7b2c\u4e00\u6b21\u8fd0\u884c\u3002\u987a\u5e8f\u6267\u884c\u3002setTimeout\u7684\u4ee3\u7801\u5148\u653e\u5165\u4e86\u5b8f\u4efb\u52a1\u961f\u5217\u91cc\u3002Promise\u4e2d\u7684\u201c\u600e\u4e48\u4e5f\u98de\u4e0d\u51fa\u201d\u7684\u8f93\u51fa\u5c5e\u4e8e\u540c\u6b65\u4efb\u52a1\uff0c\u4f1a\u7acb\u5373\u88ab\u6253\u5370\u51fa\u6765\u3002.then\u540e\u7684\u4ee3\u7801\u88ab\u653e\u5165\u5fae\u4efb\u52a1\u961f\u5217\u3002\u6700\u540e\u6267\u884c\u6253\u5370\u7684\u201c\u666e\u666e\u901a\u901a\u5c0f\u8f93\u51fa\u201d\u8fd9\u4e2a\u540c\u6b65\u4efb\u52a1\u3002<\/li>\n\n\n\n<li>\u63a5\u7740\u51c6\u5907\u6267\u884c\u5b8f\u4efb\u52a1\u961f\u5217\u4e2d\u7684\u4efb\u52a1\uff0c\u5148\u8be2\u95ee\u4e00\u4e0b\u5fae\u4efb\u52a1\u961f\u5217\u662f\u4e0d\u662f\u7a7a\u7684\uff0c\u7ed3\u679c\u53d1\u73b0\u6709\u4e2a\u201c\u82b1\u82b1\u7684\u4e16\u754c\u201d\u53ef\u601c\u5730\u7b49\u5f85\u7740\uff0c\u5c31\u5148\u6267\u884c\u6253\u5370\u201c\u82b1\u82b1\u7684\u4e16\u754c\u201d\u3002<\/li>\n\n\n\n<li>\u4fdd\u8bc1\u4e86\u5fae\u4efb\u52a1\u961f\u5217\u662f\u7a7a\u7684\u4e86\uff0c\u5c31\u56de\u5230\u5b8f\u4efb\u52a1\u961f\u5217\u4e2d\uff0c\u628a\u8fd9\u4e2a\u5b8f\u4efb\u52a1\u653e\u5165\u5230\u4e3b\u7ebf\u7a0b\u4e2d\u6267\u884c\u8f93\u51fa\u201cssssss\u201d\u3002<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u540c\u6b65\u4efb\u52a1\uff1a\u3010\u201c\u600e\u4e48\u4e5f\u98de\u4e0d\u51fa\u201d\uff0c\u201c\u666e\u666e\u901a\u901a\u5c0f\u8f93\u51fa\u201d\u3011\uff0c\u653e\u5165\u4e3b\u7ebf\u7a0b<\/p>\n\n\n\n<p>\u5f02\u6b65\u4efb\u52a1\u4e2d\u7684\u5b8f\u4efb\u52a1\uff1a\u3010\u201csssss\u201d\u3011 \u3001\u5fae\u4efb\u52a1\uff1a\u3010\u201c\u82b1\u82b1\u7684\u4e16\u754c\u201d\u3011\uff0c\u653e\u5165\u5f02\u6b65\u961f\u5217\u3002<\/p>\n<\/blockquote>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/qqiukulele.cn\/wp-content\/uploads\/2020\/10\/2.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" 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href=\"https:\/\/cloud.tencent.com\/developer\/article\/1701427\">\u5b8f\u4efb\u52a1\u548c\u5fae\u4efb\u52a1\u5230\u5e95\u662f\u4ec0\u4e48\uff1f<\/a><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e8b\u4ef6\u5faa\u73af\u7684\u6982\u5ff5\u975e\u5e38\u7b80\u5355\u3002\u5b83\u662f\u4e00\u4e2a\u5728 JavaScript 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