{"id":211,"date":"2026-07-20T11:21:22","date_gmt":"2026-07-20T03:21:22","guid":{"rendered":"https:\/\/yykcj.com\/?p=211"},"modified":"2026-07-20T11:21:22","modified_gmt":"2026-07-20T03:21:22","slug":"node-js-%e4%ba%8b%e4%bb%b6%e5%be%aa%e7%8e%af%e6%b7%b1%e5%ba%a6%e8%a7%a3%e6%9e%90%ef%bc%9a%e4%bb%8e%e5%8e%9f%e7%90%86%e5%88%b0%e5%ae%9e%e6%88%98%ef%bc%8c%e5%bd%bb%e5%ba%95%e6%90%9e%e6%87%82%e5%bc%82","status":"publish","type":"post","link":"https:\/\/yykcj.com\/?p=211","title":{"rendered":"Node.js \u4e8b\u4ef6\u5faa\u73af\u6df1\u5ea6\u89e3\u6790\uff1a\u4ece\u539f\u7406\u5230\u5b9e\u6218\uff0c\u5f7b\u5e95\u641e\u61c2\u5f02\u6b65\u673a\u5236"},"content":{"rendered":"<h2>\u4e00\u3001\u4e3a\u4ec0\u4e48\u4f60\u9700\u8981\u7406\u89e3\u4e8b\u4ef6\u5faa\u73af\uff1f<\/h2>\n<p>\u5728 Node.js \u4e2d\uff0c\u4e8b\u4ef6\u5faa\u73af\u662f\u5f02\u6b65\u7f16\u7a0b\u7684\u6838\u5fc3\u3002\u5982\u679c\u4f60\u66fe\u4e3a <code>setTimeout<\/code> \u548c <code>Promise<\/code> \u7684\u6267\u884c\u987a\u5e8f\u611f\u5230\u56f0\u60d1\uff0c\u6216\u8005\u9047\u5230\u8fc7 <code>process.nextTick<\/code> \u5bfc\u81f4\u7684\u6027\u80fd\u95ee\u9898\uff0c\u90a3\u4e48\u8fd9\u7bc7\u6587\u7ae0\u5c31\u662f\u4e3a\u4f60\u51c6\u5907\u7684\u3002\u6211\u4eec\u5c06\u4ece\u4e8b\u4ef6\u5faa\u73af\u7684\u516d\u4e2a\u9636\u6bb5\u5165\u624b\uff0c\u914d\u5408\u4ee3\u7801\u5b9e\u9a8c\uff0c\u5f7b\u5e95\u641e\u61c2\u5f02\u6b65\u4efb\u52a1\u7684\u8c03\u5ea6\u673a\u5236\u3002<\/p>\n<h2>\u4e8c\u3001\u4e8b\u4ef6\u5faa\u73af\u7684\u516d\u4e2a\u9636\u6bb5<\/h2>\n<p>Node.js \u7684\u4e8b\u4ef6\u5faa\u73af\u7531 libuv \u5e93\u5b9e\u73b0\uff0c\u4e3b\u8981\u5305\u542b\u4ee5\u4e0b\u9636\u6bb5\uff08\u6309\u987a\u5e8f\u6267\u884c\uff09\uff1a<\/p>\n<ol>\n<li><strong>timers<\/strong>\uff1a\u6267\u884c <code>setTimeout<\/code> \u548c <code>setInterval<\/code> \u7684\u56de\u8c03\u3002<\/li>\n<li><strong>pending callbacks<\/strong>\uff1a\u6267\u884c\u5ef6\u8fdf\u5230\u4e0b\u4e00\u8f6e\u7684 I\/O \u56de\u8c03\u3002<\/li>\n<li><strong>idle, prepare<\/strong>\uff1a\u5185\u90e8\u4f7f\u7528\u3002<\/li>\n<li><strong>poll<\/strong>\uff1a\u83b7\u53d6\u65b0\u7684 I\/O \u4e8b\u4ef6\uff0c\u6267\u884c I\/O \u56de\u8c03\u3002<\/li>\n<li><strong>check<\/strong>\uff1a\u6267\u884c <code>setImmediate<\/code> \u7684\u56de\u8c03\u3002<\/li>\n<li><strong>close callbacks<\/strong>\uff1a\u6267\u884c\u5173\u95ed\u4e8b\u4ef6\u7684\u56de\u8c03\uff08\u5982 <code>socket.on('close')<\/code>\uff09\u3002<\/li>\n<\/ol>\n<p>\u6bcf\u4e2a\u9636\u6bb5\u90fd\u6709\u4e00\u4e2a<strong>\u5148\u8fdb\u5148\u51fa\u7684\u56de\u8c03\u961f\u5217<\/strong>\u3002\u5f53\u961f\u5217\u4e3a\u7a7a\u6216\u8fbe\u5230\u6700\u5927\u9650\u5236\u65f6\uff0c\u4e8b\u4ef6\u5faa\u73af\u4f1a\u8fdb\u5165\u4e0b\u4e00\u4e2a\u9636\u6bb5\u3002<\/p>\n<h2>\u4e09\u3001\u5fae\u4efb\u52a1\u4e0e\u5b8f\u4efb\u52a1<\/h2>\n<p>\u5728 Node.js \u4e2d\uff0c\u4efb\u52a1\u5206\u4e3a\u4e24\u7c7b\uff1a<\/p>\n<ul>\n<li><strong>\u5b8f\u4efb\u52a1\uff08MacroTask\uff09<\/strong>\uff1a\u7531\u4e8b\u4ef6\u5faa\u73af\u7684\u5404\u4e2a\u9636\u6bb5\u5904\u7406\uff0c\u5982 <code>setTimeout<\/code>\u3001<code>setInterval<\/code>\u3001<code>setImmediate<\/code>\u3001I\/O \u56de\u8c03\u3002<\/li>\n<li><strong>\u5fae\u4efb\u52a1\uff08MicroTask\uff09<\/strong>\uff1a\u5728\u6bcf\u4e2a\u5b8f\u4efb\u52a1\u5b8c\u6210\u540e\u7acb\u5373\u6267\u884c\uff0c\u5305\u62ec <code>process.nextTick<\/code> \u548c <code>Promise.then\/catch\/finally<\/code>\u3002<\/li>\n<\/ul>\n<p><strong>\u6ce8\u610f<\/strong>\uff1a<code>process.nextTick<\/code> \u7684\u4f18\u5148\u7ea7\u9ad8\u4e8e Promise \u5fae\u4efb\u52a1\uff0c\u5b83\u662f\u201c\u5fae\u4efb\u52a1\u4e2d\u7684\u5fae\u4efb\u52a1\u201d\u3002<\/p>\n<h2>\u56db\u3001\u5b9e\u6218\uff1a\u4ee3\u7801\u5b9e\u9a8c<\/h2>\n<h3>\u5b9e\u9a8c 1\uff1a\u57fa\u672c\u6267\u884c\u987a\u5e8f<\/h3>\n<pre><code class=\"language-javascript\">\nconsole.log(&#x27;1: start&#x27;);\n\nsetTimeout(() =&gt; {\n    console.log(&#x27;2: setTimeout&#x27;);\n}, 0);\n\nsetImmediate(() =&gt; {\n    console.log(&#x27;3: setImmediate&#x27;);\n});\n\nprocess.nextTick(() =&gt; {\n    console.log(&#x27;4: nextTick&#x27;);\n});\n\nPromise.resolve().then(() =&gt; {\n    console.log(&#x27;5: Promise&#x27;);\n});\n\nconsole.log(&#x27;6: end&#x27;);\n<\/code><\/pre>\n<p><strong>\u8f93\u51fa\u7ed3\u679c<\/strong>\uff1a<\/p>\n<pre><code>\n1: start\n6: end\n4: nextTick\n5: Promise\n2: setTimeout\n3: setImmediate\n<\/code><\/pre>\n<p><strong>\u89e3\u91ca<\/strong>\uff1a<\/p>\n<ul>\n<li>\u540c\u6b65\u4ee3\u7801\u5148\u6267\u884c\uff0c\u6253\u5370 1 \u548c 6\u3002<\/li>\n<li>\u5fae\u4efb\u52a1\u5728\u5b8f\u4efb\u52a1\u4e4b\u524d\u6267\u884c\uff1a<code>process.nextTick<\/code> \u4f18\u5148\u4e8e Promise\u3002<\/li>\n<li>\u5b8f\u4efb\u52a1\u4e2d\uff0c<code>setTimeout<\/code> \u5728 timers \u9636\u6bb5\u6267\u884c\uff0c<code>setImmediate<\/code> \u5728 check \u9636\u6bb5\u6267\u884c\u3002\u7531\u4e8e timers \u9636\u6bb5\u5148\u4e8e check\uff0c\u6240\u4ee5 2 \u5148\u4e8e 3\u3002<\/li>\n<\/ul>\n<h3>\u5b9e\u9a8c 2\uff1asetTimeout vs setImmediate \u7684\u5fae\u5999\u5dee\u5f02<\/h3>\n<pre><code class=\"language-javascript\">\nconst fs = require(&#x27;fs&#x27;);\n\nfs.readFile(__filename, () =&gt; {\n    setTimeout(() =&gt; {\n        console.log(&#x27;1: setTimeout&#x27;);\n    }, 0);\n\n    setImmediate(() =&gt; {\n        console.log(&#x27;2: setImmediate&#x27;);\n    });\n});\n<\/code><\/pre>\n<p><strong>\u8f93\u51fa\u7ed3\u679c\uff08\u51e0\u4e4e\u603b\u662f\uff09<\/strong>\uff1a<\/p>\n<pre><code>\n2: setImmediate\n1: setTimeout\n<\/code><\/pre>\n<p><strong>\u89e3\u91ca<\/strong>\uff1a\u5f53\u5728 I\/O \u56de\u8c03\u4e2d\uff08poll \u9636\u6bb5\uff09\u6ce8\u518c <code>setTimeout<\/code> \u548c <code>setImmediate<\/code> \u65f6\uff0cpoll \u9636\u6bb5\u4e4b\u540e\u76f4\u63a5\u8fdb\u5165 check \u9636\u6bb5\uff0c\u56e0\u6b64 <code>setImmediate<\/code> \u5148\u6267\u884c\u3002\u800c <code>setTimeout<\/code> \u9700\u8981\u7b49\u5230\u4e0b\u4e00\u8f6e timers \u9636\u6bb5\u3002<\/p>\n<p><strong>\ud83d\udca1 \u8e29\u5751\u63d0\u793a<\/strong>\uff1a\u5982\u679c\u4e0d\u5728 I\/O \u56de\u8c03\u4e2d\uff0c<code>setTimeout<\/code> \u548c <code>setImmediate<\/code> \u7684\u6267\u884c\u987a\u5e8f\u53ef\u80fd\u4e0d\u786e\u5b9a\uff0c\u56e0\u4e3a\u4e3b\u6a21\u5757\u7684\u542f\u52a8\u65f6\u95f4\u53ef\u80fd\u5f71\u54cd timers \u7684\u89e6\u53d1\u3002<\/p>\n<h3>\u5b9e\u9a8c 3\uff1aprocess.nextTick \u7684\u9012\u5f52\u9677\u9631<\/h3>\n<pre><code class=\"language-javascript\">\nfunction recursiveNextTick() {\n    process.nextTick(() =&gt; {\n        console.log(&#x27;nextTick&#x27;);\n        recursiveNextTick(); \/\/ \u9012\u5f52\u8c03\u7528\n    });\n}\n\nrecursiveNextTick();\n\nsetTimeout(() =&gt; {\n    console.log(&#x27;setTimeout&#x27;);\n}, 100);\n<\/code><\/pre>\n<p><strong>\u8f93\u51fa<\/strong>\uff1a<\/p>\n<pre><code>\nnextTick\nnextTick\nnextTick\n...\uff08\u65e0\u9650\u5faa\u73af\uff0c\u6c38\u8fdc\u4e0d\u4f1a\u6267\u884c setTimeout\uff09\n<\/code><\/pre>\n<p><strong>\u89e3\u91ca<\/strong>\uff1a<code>process.nextTick<\/code> \u4f1a\u5728\u5f53\u524d\u9636\u6bb5\u7ed3\u675f\u524d\u53cd\u590d\u6267\u884c\uff0c\u5bfc\u81f4\u4e8b\u4ef6\u5faa\u73af\u6c38\u8fdc\u65e0\u6cd5\u8fdb\u5165\u4e0b\u4e00\u9636\u6bb5\u3002\u56e0\u6b64\uff0c<strong>\u907f\u514d\u5728 <code>process.nextTick<\/code> \u4e2d\u9012\u5f52\u6216\u4f7f\u7528\u957f\u5faa\u73af<\/strong>\u3002<\/p>\n<h2>\u4e94\u3001\u6700\u4f73\u5b9e\u8df5<\/h2>\n<ol>\n<li><strong>\u4f18\u5148\u4f7f\u7528 <code>setImmediate<\/code> \u800c\u975e <code>setTimeout(fn, 0)<\/code><\/strong>\uff1a<code>setImmediate<\/code> \u5728 check \u9636\u6bb5\u6267\u884c\uff0c\u6027\u80fd\u66f4\u4f18\uff0c\u4e14\u4e0d\u53d7\u5b9a\u65f6\u5668\u7cbe\u5ea6\u5f71\u54cd\u3002<\/li>\n<li><strong>\u907f\u514d\u6ee5\u7528 <code>process.nextTick<\/code><\/strong>\uff1a\u5b83\u53ef\u80fd\u963b\u585e\u4e8b\u4ef6\u5faa\u73af\u3002\u5efa\u8bae\u4f7f\u7528 <code>setImmediate<\/code> \u6216 <code>Promise<\/code> \u6765\u63a8\u8fdf\u4efb\u52a1\u3002<\/li>\n<li><strong>\u7406\u89e3\u5fae\u4efb\u52a1\u7684\u6267\u884c\u65f6\u673a<\/strong>\uff1a\u5fae\u4efb\u52a1\u4f1a\u5728\u6bcf\u4e2a\u5b8f\u4efb\u52a1\u540e\u7acb\u5373\u6267\u884c\uff0c\u5305\u62ec <code>process.nextTick<\/code> \u548c Promise\u3002\u56e0\u6b64\uff0c\u53ef\u4ee5\u5728\u5fae\u4efb\u52a1\u4e2d\u5904\u7406\u9ad8\u4f18\u5148\u7ea7\u7684\u5f02\u6b65\u64cd\u4f5c\u3002<\/li>\n<li><strong>\u4f7f\u7528 <code>async\/await<\/code> \u65f6\u6ce8\u610f<\/strong>\uff1a<code>await<\/code> \u4e4b\u540e\u7684\u4ee3\u7801\u76f8\u5f53\u4e8e <code>Promise.then<\/code>\uff0c\u5c5e\u4e8e\u5fae\u4efb\u52a1\u3002<\/li>\n<\/ol>\n<h2>\u516d\u3001\u603b\u7ed3<\/h2>\n<p>Node.js \u4e8b\u4ef6\u5faa\u73af\u662f\u5f02\u6b65\u7f16\u7a0b\u7684\u57fa\u77f3\u3002\u901a\u8fc7\u7406\u89e3\u516d\u4e2a\u9636\u6bb5\u548c\u5fae\u4efb\u52a1\/\u5b8f\u4efb\u52a1\u7684\u6267\u884c\u987a\u5e8f\uff0c\u4f60\u53ef\u4ee5\u7f16\u5199\u51fa\u66f4\u9ad8\u6548\u3001\u66f4\u53ef\u9884\u6d4b\u7684\u4ee3\u7801\u3002\u8bb0\u4f4f\uff1a<\/p>\n<ul>\n<li>\u540c\u6b65\u4ee3\u7801 > \u5fae\u4efb\u52a1\uff08nextTick > Promise\uff09 > \u5b8f\u4efb\u52a1\uff08timers > I\/O > check > close\uff09<\/li>\n<li>\u5728 I\/O \u56de\u8c03\u4e2d\uff0c<code>setImmediate<\/code> \u4f18\u5148\u4e8e <code>setTimeout<\/code><\/li>\n<li>\u8c28\u614e\u4f7f\u7528 <code>process.nextTick<\/code>\uff0c\u907f\u514d\u9012\u5f52<\/li>\n<\/ul>\n<p>\u4e0b\u4e00\u6b65\uff0c\u4f60\u53ef\u4ee5\u9605\u8bfb Node.js \u5b98\u65b9\u6587\u6863\u5173\u4e8e <a href=\"https:\/\/nodejs.org\/en\/docs\/guides\/event-loop-timers-and-nexttick\/\">Event Loop<\/a> \u7684\u8be6\u7ec6\u8bf4\u660e\uff0c\u6216\u8005\u6df1\u5165 libuv \u6e90\u7801\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u6587\u6df1\u5165\u89e3\u6790 Node.js 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