{"id":32362,"date":"2023-11-11T14:27:05","date_gmt":"2023-04-13T22:11:11","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/promise-%e4%bb%80%e4%b9%88%e6%97%b6%e5%80%99%e4%bc%9a%e8%a2%ab%e5%8f%ac%e5%94%a4%ef%bc%9f\/"},"modified":"2024-05-04T08:31:01","modified_gmt":"2024-05-04T00:31:01","slug":"promise-%e4%bb%80%e4%b9%88%e6%97%b6%e5%80%99%e4%bc%9a%e8%a2%ab%e5%8f%ac%e5%94%a4%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/promise-%e4%bb%80%e4%b9%88%e6%97%b6%e5%80%99%e4%bc%9a%e8%a2%ab%e5%8f%ac%e5%94%a4%ef%bc%9f\/","title":{"rendered":"Promise \u4ec0\u4e48\u65f6\u5019\u4f1a\u88ab\u53ec\u5524\uff1f"},"content":{"rendered":"<p>\u627f\u8bfa\u5c06\u5728\u4ec0\u4e48\u65f6\u5019\u88ab\u8c03\u7528\uff1f<br \/>\n\u5728\u4f7f\u7528\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4e4b\u524d\u6ca1\u6709\u592a\u610f\u8bc6\u5230\uff0c\u4f46\u6211\u62c5\u5fc3\u4f7f\u7528async\/await\u4f1a\u963b\u585e\u5904\u7406\uff0c\u6240\u4ee5\u6211\u60f3\u77e5\u9053Promise\u7684\u56de\u8c03\u5c06\u5728\u4ec0\u4e48\u65f6\u5019\u8fdb\u884c\uff0c\u6240\u4ee5\u73b0\u5728\u6211\u5bf9\u6b64\u8fdb\u884c\u4e86\u8c03\u67e5\u3002<br \/>\n\u5173\u4e8ePromise\u88ab\u8c03\u7528\u7684\u673a\u5236\uff0c\u9700\u8981\u5148\u4e86\u89e3\u4e8b\u4ef6\u5faa\u73af\u548c\u5fae\u4efb\u52a1\u3002<\/p>\n<p>\u5982\u679c\u5148\u5199\u7ed3\u8bba\u7684\u8bdd\uff0c\u4ee5\u4e0b\u662f\u5927\u81f4\u7684\u611f\u89c9\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Promise\u306fEventLoop\u5185\u306emicrotask\u30ad\u30e5\u30fc\u3067FIFO\u5b9f\u884c\u3055\u308c\u308b\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Timer\u7cfb\u306e\u51e6\u7406(setImmediate\u3084setTimeout\uff09\u306fmicrotask\u304c\u5168\u3066\u5b9f\u884c\u3055\u308c\u305f\u5f8c\u306b\u5b9f\u884c\u3055\u308c\u308b\u3002\uff08\u3064\u307e\u308a\u3001setTimeout(fn, 0)\u306fmicrotask\u3092\u5168\u3066\u5b9f\u884c\u3057\u305f\u5f8c\u306bfn\u3092\u5b9f\u884c\u3059\u308b\u3068\u3044\u3046\u610f\u5473\uff09<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">async\/await\u306fPromise\u306e\u7b87\u6240\u3067suspend\u3057\u3066\u3044\u308b\u306b\u904e\u304e\u306a\u3044\uff08\u30a4\u30d9\u30f3\u30c8\u30eb\u30fc\u30d7\u3092\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0\u3059\u308b\u304b\u3069\u3046\u304b\u306fPromise\u5185\u90e8\u306e\u51e6\u7406\u306b\u4f9d\u5b58\u3059\u308b\uff09\u3001\u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u6587\u6cd5\uff08yield\uff09\u3084\u30b3\u30eb\u30fc\u30c1\u30f3\u306e\u6982\u5ff5\u3068\u540c\u3058\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">NodeJS v12\u4ee5\u964d\u3067\u306fasync\/await\u306b\u3088\u308b\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u52a3\u5316\u306f\u6539\u5584\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3001\u51e6\u7406\u306e\u5b9f\u884c\u9806\u5e8f\u306e\u898b\u3084\u3059\u3055\u7684\u306b\u7a4d\u6975\u7684\u306b\u66f8\u3044\u3066\u554f\u984c\u306a\u3044\u3002\uff08\u305f\u3060\u3057\u3001async\/await\u95a2\u4fc2\u306a\u3057\u306b\u5f85\u305f\u306a\u304f\u3066\u826f\u3044\u51e6\u7406\u306b\u95a2\u3057\u3066\u306f\u30ec\u30b9\u30dd\u30f3\u30b9\u3092\u8fd4\u3057\u305f\u5f8c\u306b\u5b9f\u884c\u3059\u3079\u3057\u306a\u306e\u3068I\/O\u7cfb\u306eSync\u30e1\u30bd\u30c3\u30c9\u306f\u4f7f\u308f\u306a\u3044\u307b\u3046\u304c\u826f\u3044\uff09<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u30d6\u30e9\u30a6\u30b6\u3067\u3082Promise\u306fqueueMicrotask\u306b\u3088\u3063\u3066\u5b9f\u88c5\u3055\u308c\u3066\u3044\u308b\uff08\u305d\u3082\u305d\u3082Promise\u3001async\/await\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u306a\u3044\u30d6\u30e9\u30a6\u30b6\u3082\u307e\u3060\u751f\u304d\u6b8b\u3063\u3066\u3044\u308b\u306e\u3067\u30c8\u30e9\u30f3\u30b9\u30d1\u30a4\u30eb\u5fc5\u9808\u3060\u304c\uff09<\/ul>\n<h1>\u5982\u679c\u662fNodeJS\u7684\u60c5\u51b5<\/h1>\n<p>NodeJS\u662f\u4e00\u4e2a\u8fd0\u884c\u5728V8\u5f15\u64ce\u4e0a\u7684JavaScript\u6267\u884c\u73af\u5883\uff08\u5728Google Chrome\u7684Chromium\u4e2d\u4e5f\u4f7f\u7528\uff09\u3002\u6700\u521d\u5b83\u662f\u4e3a\u4e86\u89e3\u51b3C10K\u95ee\u9898\uff08\u5373\u5728\u670d\u52a1\u5668\u7684\u786c\u4ef6\u6027\u80fd\u8db3\u591f\u7684\u60c5\u51b5\u4e0b\uff0c\u5f53\u5ba2\u6237\u7aef\u7684\u5e76\u53d1\u8fde\u63a5\u6570\u589e\u52a0\u65f6\uff0c\u670d\u52a1\u7684\u54cd\u5e94\u53d8\u6162\uff09\u800c\u5f00\u53d1\u7684\u540e\u7aef\u73af\u5883\uff08\u5e94\u7528\u670d\u52a1\u5668\uff09\u3002C10K\u95ee\u9898\u5e76\u4e0d\u662f\u7531\u786c\u4ef6\u6027\u80fd\u5f15\u8d77\u7684\uff0c\u800c\u662f\u7531\u64cd\u4f5c\u7cfb\u7edf\u9650\u5236\u5bfc\u81f4\u7684\u5ba2\u6237\u7aef\u5e76\u53d1\u8fde\u63a5\u6570\u7684\u4e0a\u9650\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30d7\u30ed\u30bb\u30b9\u6570\u306e\u4e0a\u9650<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u30b9\u30a4\u30c3\u30c1\uff08\u5207\u308a\u66ff\u3048\uff09\u306e\u30b3\u30b9\u30c8<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u30d5\u30a1\u30a4\u30eb\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u306e\u4e0a\u9650<\/ul>\n<p>\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e9b\u95ee\u9898\uff0cNodeJS\u7684\u8bbe\u8ba1\u662f\u91c7\u7528\u5355\u8fdb\u7a0b\uff0c\u5355\u7ebf\u7a0b\u6765\u5904\u7406\u8bf7\u6c42\u3002\uff08\u5b9e\u9645\u4e0a\uff0c\u5b83\u4e5f\u53ef\u4ee5\u521b\u5efa\u591a\u4e2a\u8fdb\u7a0b\u548c\u591a\u4e2a\u7ebf\u7a0b\uff0c\u4f46\u6839\u672c\u7684\u8bbe\u8ba1\u7406\u5ff5\u662f\u5982\u6b64\u3002\uff09<br \/>\n\u901a\u8fc7\u5355\u8fdb\u7a0b\uff0c\u5355\u7ebf\u7a0b\u5904\u7406\u6240\u6709\u8bf7\u6c42\uff0c\u53ef\u4ee5\u907f\u514d\u53d7\u5230\u8fdb\u7a0b\u6570\u91cf\u4e0a\u9650\u7684\u9650\u5236\uff0c\u5e76\u4e14\u4e0d\u4f1a\u4ea7\u751f\u5927\u91cf\u7684\u591a\u8fdb\u7a0b\u3001\u591a\u7ebf\u7a0b\u7684\u4e0a\u4e0b\u6587\u5207\u6362\u3002<br \/>\n\u6570\u636e\u5e93\u8fde\u63a5\u4e5f\u4e0d\u662f\u6bcf\u4e2a\u591a\u8fdb\u7a0b\u5355\u72ec\u8fde\u63a5\uff0c\u800c\u662f\u5728\u5355\u7ebf\u7a0b\u5185\u590d\u7528\uff0c\u8fd9\u6837\u5c31\u4e0d\u4f1a\u8fbe\u5230\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u4e0a\u9650\u3002<br \/>\n\u7136\u800c\uff0c\u7531\u4e8e\u5728\u5355\u7ebf\u7a0b\u4e2d\u8fdb\u884c\u6587\u4ef6\u7684\u8bfb\u5199\u4f1a\u5bfc\u81f4\u963b\u585e\u5176\u4ed6\u5904\u7406\uff0c\u56e0\u6b64\u6211\u4eec\u652f\u6301\u548c\u63a8\u8350\u5f02\u6b65I\/O\u3002<br \/>\n\u7528\u4e8e\u7ba1\u7406\u5355\u7ebf\u7a0b\u5904\u7406\u7684\u8bf7\u6c42\u7684\u673a\u5236\u662f\u4e8b\u4ef6\u961f\u5217\uff08\u4e8b\u4ef6\u5faa\u73af\uff09\u3002<br \/>\n\u4e0e\u4f20\u7edf\u7684\u6bcf\u4e2a\u8bf7\u6c42\u542f\u52a8\u4e00\u4e2a\u8fdb\u7a0b\u7684\u591a\u8fdb\u7a0b\u7c7b\u578b\u7684\u5e94\u7528\u670d\u52a1\u5668\u4e0d\u540c\uff0c<br \/>\n\u5355\u8fdb\u7a0b\u3001\u5355\u7ebf\u7a0b\u4f1a\u5c06\u8bf7\u6c42\u9010\u4e2a\u653e\u5165\u4e8b\u4ef6\u961f\u5217\u4e2d\uff0c\u5e76\u5728\u5f02\u6b65\u83b7\u53d6\u6765\u81ea\u6570\u636e\u5e93\u548c\u6587\u4ef6\u7684\u6570\u636e\u540e\u8fd4\u56de\u54cd\u5e94\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d117737434c4406bf38f6\/7-0.png\" alt=\"event-queue.png\" \/><\/div>\n<p>\u53c2\u8003\u8d44\u6599\uff1a\u73b0\u5728\u624d\u95ee\u7684Node.js<\/p>\n<p>\u4ee5\u4e0a\u6240\u8ff0\uff0cNodeJS\u89e3\u51b3\u4e86C10K\u95ee\u9898\uff0c\u91c7\u7528\u4e86\u5355\u8fdb\u7a0b\u5355\u7ebf\u7a0b\u7684\u4e8b\u4ef6\u5faa\u73af\u3002\u7136\u800c\uff0c\u5355\u7ebf\u7a0b\u5e26\u6765\u7684\u95ee\u9898\u662f\uff0c\u5982\u679c\u51fa\u73b0\u9ad8\u8d1f\u8f7d\u7684\u5faa\u73af\u5904\u7406\u7b49\u60c5\u51b5\uff0c\u4f1a\u963b\u585e\u4e8b\u4ef6\u5faa\u73af\uff0c\u5bf9\u6240\u6709\u8bf7\u6c42\u4ea7\u751f\u5ef6\u8fdf\u6216\u6700\u5dee\u54cd\u5e94\u7684\u5f71\u54cd\u3002<\/p>\n<p>\u597d\u5427\uff0c\u73b0\u5728\u6211\u4eec\u6765\u8ba8\u8bba\u4e00\u4e0b\u5728NodeJS\u4e2dPromise\u88ab\u8c03\u7528\u7684\u65f6\u673a\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nx\">setTimeout<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span><span class=\"mi\">1<\/span><span class=\"p\">));<\/span>\r\n<span class=\"nx\">setImmediate<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span><span class=\"mi\">2<\/span><span class=\"p\">));<\/span>\r\n<span class=\"nx\">process<\/span><span class=\"p\">.<\/span><span class=\"nx\">nextTick<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span><span class=\"mi\">3<\/span><span class=\"p\">));<\/span>\r\n<span class=\"nb\">Promise<\/span><span class=\"p\">.<\/span><span class=\"nx\">resolve<\/span><span class=\"p\">().<\/span><span class=\"nx\">then<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span><span class=\"mi\">4<\/span><span class=\"p\">));<\/span>\r\n<span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span><span class=\"mi\">5<\/span><span class=\"p\">))();<\/span>\r\n<\/code><\/pre>\n<p>\u6267\u884c\u7ed3\u679c\u5982\u4e0b\uff1a<br \/>\n\u540c\u6b65\u6267\u884c\u2192nextTick\u2192Promise\uff08\u5fae\u4efb\u52a1\uff09\u2192setTimeout\u2192setImmediate<br \/>\n\u7684\u987a\u5e8f\u662f\u8fd9\u6837\u7684\u3002<\/p>\n<pre class=\"post-pre\"><code>5\r\n3\r\n4\r\n1\r\n2\r\n<\/code><\/pre>\n<p>\u53ea\u6709 (() =&gt; console.log(5))() \u662f\u540c\u6b65\u4efb\u52a1\uff0c\u5176\u4ed6\u90fd\u662f\u5f02\u6b65\u4efb\u52a1\u3002<\/p>\n<p>\u867d\u7136\u6211\u4eec\u53ef\u4ee5\u7406\u89e3\u540c\u6b65\u4efb\u52a1\u662f\u6700\u5148\u6267\u884c\u7684\uff0c\u4f46\u662f\u6211\u4eec\u9700\u8981\u6df1\u5165\u4e86\u89e3\u4e8b\u4ef6\u5faa\u73af\u6765\u770b\u770b\u5f02\u6b65\u4efb\u52a1\u7684\u987a\u5e8f\u662f\u5982\u4f55\u786e\u5b9a\u7684\u3002<\/p>\n<p>\u4e8b\u4ef6\u5faa\u73af\u662f\u7531 libuv \u5b9e\u73b0\u7684\uff0c\u5728 NodeJS \u542f\u52a8\u65f6\u521d\u59cb\u5316\u4ee5\u4e0b\u4e8b\u4ef6\u5faa\u73af\u3002<br \/>\n\uff08\u4f46 nextTickQueue \u548c microTaskQueue \u662f\u7531 NodeJS \u5b9e\u73b0\u7684\uff09<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d117737434c4406bf38f6\/15-0.png\" alt=\"20180925232715.png\" \/><\/div>\n<p>\u9996\u5148\uff0c\u5728\u8fdb\u5165\u4e8b\u4ef6\u5faa\u73af\u4e4b\u524d\u6216\u6bcf\u4e2a\u4e8b\u4ef6\u5faa\u73af\u9636\u6bb5\u4e4b\u540e\uff0c\u5982\u679c\u961f\u5217\u4e2d\u5b58\u5728\u4efb\u52a1\uff0c\u5219\u4f1a\u6267\u884c\u8fd9\u4e9b\u4efb\u52a1\u76f4\u5230\u961f\u5217\u4e3a\u7a7a\u3002<br \/>\n\uff08\u7531\u4e8e\u4e8b\u4ef6\u5faa\u73af\u662f\u5355\u7ebf\u7a0b\u7684\uff0c\u65e0\u6cd5\u540c\u65f6\u5904\u7406\u591a\u4e2a\u4efb\u52a1\uff09<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">nextTickQueue\u306f\u5168\u3066\u306e\u30ad\u30e5\u30fc\u306e\u4e2d\u3067\u6700\u901f\u306b\u51e6\u7406\u3055\u308c\u308b\u2192nextTick\u304c\u5b9f\u884c\u3055\u308c\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">microTaskQueue\u306fnextTickQueue\u304c\u7a7a\u306b\u306a\u308a\u6b21\u7b2c\u3001\u5b9f\u884c(Promises\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u306f\u3053\u3053\u306b\u6240\u5c5e)\u2192Promise\u304c\u5b9f\u884c\u3055\u308c\u308b<\/ul>\n<p>\u5f53\u961f\u5217\u88ab\u6d88\u9664\u540e\uff0c\u4f1a\u4ece\u8ba1\u65f6\u5668\u9636\u6bb5\u8fdb\u5165\u4e8b\u4ef6\u5faa\u73af\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Timer\u30d5\u30a7\u30fc\u30ba\u3067setTimeout\u304c\u547c\u3070\u308c\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">Check\u30d5\u30a7\u30fc\u30ba\u3067setImmediate\u304c\u5fc5\u305a\u547c\u3070\u308c\u308b<\/ul>\n<p>\u56e0\u6b64\u540c\u6b65\u57f7\u884c -&gt; nextTick -&gt; Promise\uff08\u5fae\u4efb\u52d9\uff09-&gt; setTimeout -&gt; setImmediate\u3002<\/p>\n<p>\u53c2\u8003\u6587\u732e\uff1a\u5173\u4e8eNode.js\u4e2d\u4e8b\u4ef6\u5faa\u73af\u673a\u5236\u548c\u5b9a\u65f6\u5668\u7684\u7ec6\u8282<\/p>\n<p>\u4f5c\u4e3a\u5355\u7ebf\u7a0b\u7684\u4e00\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u5df2\u7ecf\u63d0\u5230\u4e86\u963b\u585e\u5176\u4ed6\u5904\u7406\u7684\u95ee\u9898\u3002<br \/>\n\u5373\u4f7f\u4f7f\u7528async\u51fd\u6570\uff0c\u5982\u4e0b\u4f8b\u5b50\u6240\u793a\uff0c\u7531\u4e8e\u5176\u5e95\u5c42\u4ecd\u7136\u662f\u5355\u7ebf\u7a0b\uff0c\u6267\u884c\u9ad8\u8d1f\u8f7d\u5904\u7406\u5c06\u4f1a\u963b\u585e\u6240\u6709\u8bf7\u6c42\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nx\">app<\/span><span class=\"p\">.<\/span><span class=\"kd\">get<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">\/compute-async<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span> <span class=\"k\">async<\/span> <span class=\"kd\">function<\/span> <span class=\"nx\">computeAsync<\/span><span class=\"p\">(<\/span><span class=\"nx\">req<\/span><span class=\"p\">,<\/span> <span class=\"nx\">res<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"nx\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">computing async!<\/span><span class=\"dl\">'<\/span><span class=\"p\">);<\/span>\r\n\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">hash<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">crypto<\/span><span class=\"p\">.<\/span><span class=\"nx\">createHash<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">sha256<\/span><span class=\"dl\">'<\/span><span class=\"p\">);<\/span>\r\n\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">asyncUpdate<\/span> <span class=\"o\">=<\/span> <span class=\"k\">async<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">hash<\/span><span class=\"p\">.<\/span><span class=\"nx\">update<\/span><span class=\"p\">(<\/span><span class=\"nx\">randomString<\/span><span class=\"p\">());<\/span>\r\n\r\n  <span class=\"k\">for<\/span> <span class=\"p\">(<\/span><span class=\"kd\">let<\/span> <span class=\"nx\">i<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">0<\/span><span class=\"p\">;<\/span> <span class=\"nx\">i<\/span> <span class=\"o\">&lt;<\/span> <span class=\"mi\">10<\/span><span class=\"nx\">e6<\/span><span class=\"p\">;<\/span> <span class=\"nx\">i<\/span><span class=\"o\">++<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">await<\/span> <span class=\"nx\">asyncUpdate<\/span><span class=\"p\">();<\/span>\r\n  <span class=\"p\">}<\/span>\r\n  <span class=\"nx\">res<\/span><span class=\"p\">.<\/span><span class=\"nx\">send<\/span><span class=\"p\">(<\/span><span class=\"nx\">hash<\/span><span class=\"p\">.<\/span><span class=\"nx\">digest<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">hex<\/span><span class=\"dl\">'<\/span><span class=\"p\">)<\/span> <span class=\"o\">+<\/span> <span class=\"dl\">'<\/span><span class=\"se\">\\n<\/span><span class=\"dl\">'<\/span><span class=\"p\">);<\/span>\r\n<span class=\"p\">});<\/span>\r\n<\/code><\/pre>\n<p>\u5176\u5b9e\u901a\u8fc7\u5728setTimeout\u4e2d\u95f4\u63d2\u5165\u53ef\u4ee5\u5728\u4e0d\u963b\u585e\u5176\u4ed6\u8bf7\u6c42\u7684\u60c5\u51b5\u4e0b\u7ee7\u7eed\u8fdb\u884c\u9ad8\u8d1f\u8f7d\u5904\u7406\u3002\u5982\u679c\u4e4b\u524d\u7406\u89e3\u4e86\u4e8b\u4ef6\u5faa\u73af\uff0c\u5c31\u53ef\u4ee5\u901a\u8fc7\u5728Promise await\uff08\u5fae\u4efb\u52a1\uff09\u4e4b\u95f4\u63d2\u5165setTimeout\u6765\u5c06\u5927\u91cf\u5904\u7406\u90fd\u538b\u7f29\u5230\u5fae\u4efb\u52a1\u4e2d\u5e76\u6267\u884c\uff0c\u800c\u4e0d\u662f\u4e00\u6b21\u6027\u6267\u884c\u6240\u6709\u5904\u7406\u540e\u518d\u6267\u884c\u3002\u8fd9\u6837\u53ef\u4ee5\u5728\u5fae\u4efb\u52a1&#8211;&gt;setTimeout&#8211;&gt;\u5fae\u4efb\u52a1&#8211;&gt;setTimeout\u4e4b\u95f4\u52a0\u5165\u95f4\u9694\uff0c\u907f\u514d\u4e86\u963b\u585e\u5176\u4ed6\u5904\u7406\u7684\u60c5\u51b5\u53d1\u751f\u3002\uff08\u8fd9\u53ea\u662f\u57fa\u4e8e\u4e8b\u4ef6\u5faa\u73af\u89c4\u8303\u7684\u4e00\u79cd\u5e94\u5bf9\u63aa\u65bd\uff0c\u6240\u4ee5\u5728NodeJS\u4e0a\u76f4\u63a5\u8fdb\u884c\u8fc7\u91cd\u7684CPU\u5904\u7406\u5e76\u4e0d\u9002\u5408\u3002\uff09<\/p>\n<pre class=\"post-pre\"><code><span class=\"nx\">app<\/span><span class=\"p\">.<\/span><span class=\"kd\">get<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">\/compute-with-set-timeout<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span> <span class=\"k\">async<\/span> <span class=\"kd\">function<\/span> <span class=\"nx\">computeWSetTimeout<\/span> <span class=\"p\">(<\/span><span class=\"nx\">req<\/span><span class=\"p\">,<\/span> <span class=\"nx\">res<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"nx\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">computing async with setTimeout!<\/span><span class=\"dl\">'<\/span><span class=\"p\">);<\/span>\r\n\r\n  <span class=\"kd\">function<\/span> <span class=\"nx\">setTimeoutPromise<\/span><span class=\"p\">(<\/span><span class=\"nx\">delay<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"k\">new<\/span> <span class=\"nb\">Promise<\/span><span class=\"p\">((<\/span><span class=\"nx\">resolve<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n      <span class=\"nx\">setTimeout<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">resolve<\/span><span class=\"p\">(),<\/span> <span class=\"nx\">delay<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"p\">});<\/span>\r\n  <span class=\"p\">}<\/span>\r\n\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">hash<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">crypto<\/span><span class=\"p\">.<\/span><span class=\"nx\">createHash<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">sha256<\/span><span class=\"dl\">'<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"k\">for<\/span> <span class=\"p\">(<\/span><span class=\"kd\">let<\/span> <span class=\"nx\">i<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">0<\/span><span class=\"p\">;<\/span> <span class=\"nx\">i<\/span> <span class=\"o\">&lt;<\/span> <span class=\"mi\">10<\/span><span class=\"nx\">e6<\/span><span class=\"p\">;<\/span> <span class=\"nx\">i<\/span><span class=\"o\">++<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nx\">hash<\/span><span class=\"p\">.<\/span><span class=\"nx\">update<\/span><span class=\"p\">(<\/span><span class=\"nx\">randomString<\/span><span class=\"p\">());<\/span>\r\n    <span class=\"k\">await<\/span> <span class=\"nx\">setTimeoutPromise<\/span><span class=\"p\">(<\/span><span class=\"mi\">0<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"p\">}<\/span>\r\n  <span class=\"nx\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">done <\/span><span class=\"dl\">'<\/span> <span class=\"o\">+<\/span> <span class=\"nx\">req<\/span><span class=\"p\">.<\/span><span class=\"nx\">url<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"nx\">res<\/span><span class=\"p\">.<\/span><span class=\"nx\">send<\/span><span class=\"p\">(<\/span><span class=\"nx\">hash<\/span><span class=\"p\">.<\/span><span class=\"nx\">digest<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">hex<\/span><span class=\"dl\">'<\/span><span class=\"p\">)<\/span> <span class=\"o\">+<\/span> <span class=\"dl\">'<\/span><span class=\"se\">\\n<\/span><span class=\"dl\">'<\/span><span class=\"p\">);<\/span>\r\n<span class=\"p\">});<\/span>\r\n<\/code><\/pre>\n<p>\u53c2\u8003: Node.js: \u5373\u4f7f\u662f\u5feb\u901f\u7684\u5f02\u6b65\u51fd\u6570\u4e5f\u53ef\u80fd\u963b\u585e\u4e8b\u4ef6\u5faa\u73af\uff0c\u5bfc\u81f4 I\/O \u9965\u997f\u3002<\/p>\n<p>\u5728NodeJS\u4e2d\uff0c\u5b58\u5728\u7740\u4e00\u4e2a\u8fc7\u7a0b\u53ef\u80fd\u6210\u4e3a\u74f6\u9888\uff0c\u4ece\u800c\u964d\u4f4e\u6574\u4e2a\u670d\u52a1\u5668\u6027\u80fd\u7684\u5371\u9669\u3002\u53e6\u5916\uff0c\u7531\u4e8e\u6301\u7eed\u5728\u540c\u4e00\u8fdb\u7a0b\u4e2d\u6267\u884c\uff0c\u4e00\u65e6\u53d1\u751f\u5185\u5b58\u6cc4\u6f0f\uff0c\u670d\u52a1\u5668\u5c06\u65e0\u6cd5\u7ee7\u7eed\u8fd0\u884c\uff0c\u56e0\u6b64\u9700\u8981\u4f7f\u7528\u8c03\u8bd5\u5de5\u5177\u548c\u6d4b\u91cf\u5de5\u5177\u6765\u8c03\u67e5\u95ee\u9898\u51fa\u5728\u54ea\u91cc\u3002<\/p>\n<p>\u53c2\u8003\uff1a\u4ece\u96f6\u5f00\u59cb\u7684Node.js\u6027\u80fd\u8c03\u4f18<\/p>\n<p>\u55ef\uff0c\u6211\u5df2\u7ecf\u77e5\u9053Promise\u5c06\u5728\u4ec0\u4e48\u65f6\u5019\u88ab\u6267\u884c\u4e86\u3002(\u5c06\u5728\u4e8b\u4ef6\u5faa\u73af\u4e4b\u95f4\u7684\u5fae\u4efb\u52a1\u961f\u5217\u4e2d\u88ab\u6267\u884c)<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d117737434c4406bf38f6\/30-0.png\" alt=\"microtasks-vs-tasks.png\" \/><\/div>\n<p>\u5982\u679c\u4f7f\u7528async\/await\u8fdb\u884c\u6267\u884c\uff0c\u4f1a\u53d1\u751f\u4ec0\u4e48\u60c5\u51b5\u5462\uff1f<br \/>\n\u4f7f\u7528async\/await\u7684\u51fd\u6570\u4f1a\u88ab\u8f6c\u6362\u4e3a\u4ee5\u4e0b\u8fd9\u79cd\u5f62\u5f0f\u7684\u51fd\u6570\uff0c\u5728V8\u5f15\u64ce\u4e0a\u6267\u884c\u3002<br \/>\n\u88ab\u6302\u8d77\uff0c\u5e76\u5728microtask\u961f\u5217\u4e2d\u6267\u884c\u4ee5\u8fd4\u56de\u6302\u8d77\u7684\u8fd4\u56de\u503c\uff0c<br \/>\n\u6700\u7ec8\u5c06implicit_promise\u4f5c\u4e3aPromise\u7684\u7ed3\u679c\u8fd4\u56de\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d117737434c4406bf38f6\/32-0.png\" alt=\"await-under-the-hood.png\" \/><\/div>\n<p>\u5728\u4f7f\u7528 async\/await \u7684\u60c5\u51b5\u4e0b\uff0c\u5e94\u8be5\u5173\u6ce8\u7684\u53e6\u4e00\u4e2a\u95ee\u9898\u662f\u6027\u80fd\u4e0b\u964d\u3002\u4f46\u662f\u5728 NodeJS v12 \u4e4b\u540e\uff0c\u4f7f\u7528\u539f\u751f\u7684 Promise \u51e0\u4e4e\u6ca1\u6709\u4ec0\u4e48\u901f\u5ea6\u95ee\u9898\uff0c\u6240\u4ee5\u6211\u8ba4\u4e3a\u53ef\u4ee5\u653e\u5fc3\u5730\u79ef\u6781\u4f7f\u7528 async\/await\uff0c\u4e0d\u7528\u62c5\u5fc3\u6027\u80fd\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d117737434c4406bf38f6\/34-0.png\" alt=\"benchmark-optimization.png\" \/><\/div>\n<p>\u6362\u53e5\u8bdd\u8bf4\uff0casync\/await\u672c\u8eab\u5e76\u4e0d\u4f1a\u5bfc\u81f4\u6027\u80fd\u4e0b\u964d\u6216\u8005\u4e8b\u4ef6\u5faa\u73af\u88ab\u963b\u585e\u3002\uff08\u53d6\u51b3\u4e8ePromise.then\u7684\u5177\u4f53\u5b9e\u73b0\u65b9\u5f0f\u53ef\u80fd\u4f1a\u6709\u8fd9\u4e2a\u95ee\u9898\uff09<\/p>\n<p>\u53c2\u8003\uff1a\u66f4\u5feb\u7684\u5f02\u6b65\u51fd\u6570\u548cpromises<\/p>\n<h1>\u5982\u679c\u662f\u4f7f\u7528\u6d4f\u89c8\u5668\u7684\u60c5\u51b5\u4e0b<\/h1>\n<p>\u5728\u6d4f\u89c8\u5668\u4e2d\uff0cJavaScript\u7684\u6267\u884c\u6d41\u7a0b\u4e5f\u662f\u57fa\u4e8eEventLoop\uff0c\u7c7b\u4f3c\u4e8eNode.js\u3002Promise\u548cMutationObserver\u4f1a\u5728\u5fae\u4efb\u52a1\u4e2d\u6267\u884c\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nx\">setTimeout<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">0<\/span><span class=\"dl\">\"<\/span><span class=\"p\">));<\/span>\r\n\r\n<span class=\"nb\">Promise<\/span><span class=\"p\">.<\/span><span class=\"nx\">resolve<\/span><span class=\"p\">()<\/span>\r\n  <span class=\"p\">.<\/span><span class=\"nx\">then<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">1<\/span><span class=\"dl\">\"<\/span><span class=\"p\">));<\/span>\r\n\r\n<span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">2<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\r\n<\/code><\/pre>\n<p>\u5728NodeJS\u4e2d\uff0c\u6267\u884c\u987a\u5e8f\u4e0e\u4e4b\u524d\u76f8\u540c\uff0c\u4f9d\u6b21\u4e3a\u540c\u6b65\u5904\u7406\u2192Promise\uff08\u5fae\u4efb\u52a1\uff09\u2192setTimeout\uff08\u8ba1\u65f6\u5668\uff09\u3002<\/p>\n<pre class=\"post-pre\"><code>2\r\n1\r\n0\r\n<\/code><\/pre>\n<p>\u5728\u5904\u7406DOM\u4e8b\u4ef6\u548c\u6e32\u67d3\u65f6\uff0c\u53e6\u4e00\u4e2a\u91cd\u8981\u7684\u70b9\u662f\u6240\u6709\u7684\u5fae\u4efb\u52a1\u5728\u5176\u4ed6\u4e8b\u4ef6\u5904\u7406\u3001\u6e32\u67d3\u6216\u8ba1\u65f6\u5668\u76f8\u5173\u5904\u7406\u4e4b\u524d\u90fd\u4f1a\u5b8c\u6210\u3002\uff08\u4e5f\u5c31\u662f\u8bf4\uff0c\u5728\u5904\u7406\u4e8b\u4ef6\u7684\u540c\u65f6\uff0c\u4e0d\u4f1a\u53d1\u751fPromise\u7f51\u7edc\u5904\u7406\u5bfc\u81f4\u6570\u636e\u88ab\u66f4\u6539\u7684\u60c5\u51b5\uff09<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d117737434c4406bf38f6\/43-0.png\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2020-06-21 21.04.17.png\" \/><\/div>\n<p>\u53c2\u8003: \u4e8b\u4ef6\u5faa\u73af(event loop): \u5fae\u4efb\u52a1(microtask)\u548c\u5b8f\u4efb\u52a1(macrotask)<\/p>\n<p>\u53ef\u80fd\u60271:<br \/>\n\u4e5f\u8bb8Jake\u5148\u751f\u5b9e\u73b0\u7684\u90a3\u7bc7\u4ecb\u7ecd\u4e86Chrome\u7684WebWorker\u7684\u535a\u5ba2\u66f4\u6613\u4e8e\u7406\u89e3\uff0c\u56e0\u4e3a\u5b83\u6709\u6837\u4f8b\u548c\u53ef\u6267\u884c\u7684\u793a\u4f8b\u3002<br \/>\n\u8865\u5145\u8bf4\u660e\u4e00\u4e0b\uff0c\u6211\u786e\u8ba4\uff0c\u89e3\u51b3\u4e86\u6d4f\u89c8\u5668\u4e4b\u95f4\u7684\u5dee\u5f02\uff0cFireFox\u3001Safari\u548cEdge\u73b0\u5728\u90fd\u4e0eChrome\u7684\u884c\u4e3a\u4e00\u81f4\uff08\u622a\u81f32020\u5e746\u670821\u65e5\uff09\u3002<br \/>\n\u7531\u4e8e\u539f\u6587\u662f2015\u5e74\u7684\uff0c\u53ef\u80fd\u5728\u65e7\u7248\u672c\u7684\u6d4f\u89c8\u5668\u4e0a\u5b58\u5728\u5dee\u5f02\u3002<\/p>\n<p>\u53c2\u8003\uff1a\u4efb\u52a1\u3001\u5fae\u4efb\u52a1\u3001\u961f\u5217\u548c\u8ba1\u5212<\/p>\n<p>\u9806\u4fbf\u63d0\u4e00\u4e0b\uff0c\u5982\u679c\u4f60\u7406\u89e3\u4e86\u4ee5\u4e0a\u5185\u5bb9\uff0c\u4f60\u5c31\u53ef\u4ee5\u89e3\u51b3\u4e0b\u4e00\u7bc7\u6587\u7ae0\u7684\u9ad8\u7ea7\u95ee\u9898\u4e86\u3002<br \/>\n\u53c2\u8003\uff1a\u4f60\u80fd\u7b54\u5bf9\u591a\u5c11\u9898\uff1f\u5173\u4e8e Promise \u768413\u9053\u9898\u3010\u9644\u89e3\u6790\u3011<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u627f\u8bfa\u5c06\u5728\u4ec0\u4e48\u65f6\u5019\u88ab\u8c03\u7528\uff1f \u5728\u4f7f\u7528\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4e4b\u524d\u6ca1\u6709\u592a\u610f\u8bc6\u5230\uff0c\u4f46\u6211\u62c5\u5fc3\u4f7f\u7528async\/await\u4f1a\u963b\u585e\u5904\u7406\uff0c\u6240\u4ee5 [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-32362","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Promise \u4ec0\u4e48\u65f6\u5019\u4f1a\u88ab\u53ec\u5524\uff1f - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/promise-\u4ec0\u4e48\u65f6\u5019\u4f1a\u88ab\u53ec\u5524\uff1f\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Promise 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