{"id":1132,"date":"2022-12-03T15:35:00","date_gmt":"2022-12-03T07:35:00","guid":{"rendered":"http:\/\/blog.xrhoujie.com\/?p=1132"},"modified":"2022-10-31T15:36:53","modified_gmt":"2022-10-31T07:36:53","slug":"%e8%bd%acvue%e4%b8%adnexttick%e6%ba%90%e7%a0%81%e8%a7%a3%e6%9e%90","status":"publish","type":"post","link":"http:\/\/blog.xrhoujie.com\/?p=1132","title":{"rendered":"(\u8f6c)Vue\u4e2d$nextTick\u6e90\u7801\u89e3\u6790"},"content":{"rendered":"\n

\u5728\u505a\u9879\u76ee\u7684\u65f6\u5019\uff0c\u6211\u4eec\u7ecf\u5e38\u4f1a\u7528\u5230nextTick\uff0c\u7b80\u5355\u7684\u7406\u89e3\u5c31\u662f\u5b83\u5c31\u662f\u4e00\u4e2asetTimeout\u51fd\u6570\uff0c\u5c06\u51fd\u6570\u653e\u5230\u5f02\u6b65\u540e\u53bb\u5904\u7406\uff1b\u5c06\u5b83\u66ff\u6362\u6210setTimeout\u597d\u50cf\u4e5f\u80fd\u8dd1\u8d77\u6765\uff0c\u4f46\u5b83\u4ec5\u4ec5\u8fd9\u4e48\u7b80\u5355\u5417\uff1f\u90a3\u4e3a\u4ec0\u4e48\u6211\u4eec\u4e0d\u76f4\u63a5\u7528setTimeout\u5462\uff1f\u8ba9\u6211\u4eec\u6df1\u5165\u5256\u6790\u4e00\u4e0b\u3002<\/p>\n\n\n\n

\u53d1\u73b0\u95ee\u9898<\/h1>\n\n\n\n

\u2003\u2003\u8bb0\u5f97\u4e4b\u524d\u6709\u4e00\u4e2a\u9700\u6c42\uff0c\u5c31\u662f\u6839\u636e\u6587\u5b57\u7684\u884c\u6570\u6765\u663e\u793a\u5c55\u5f00\u66f4\u591a\u7684\u4e00\u4e2a\u6309\u94ae\uff0c\u56e0\u6b64\u6211\u4eec\u5728Vue\u4e2d\u7ed9\u6570\u636e\u8d4b\u503c\u4e4b\u540e\u9700\u8981\u83b7\u53d6\u6587\u5b57\u9ad8\u5ea6\u3002<\/p>\n\n\n\n

<div id=\"app\">\n    <div class=\"msg\">\n        {{msg}}\n    <\/div>\n<\/div>\nnew Vue({\n    el: '#app',\n    data: function(){\n        return {\n            msg: ''\n        }\n    },\n    mounted(){\n        this.msg = '\u6211\u662f\u6d4b\u8bd5\u6587\u5b57'\n        console.log(document.querySelector('.msg').offsetHeight) \/\/0\n    }\n})\n\u590d\u5236\u4ee3\u7801<\/code><\/pre>\n\n\n\n
\u2003\u2003\u8fd9\u65f6\u4e0d\u7ba1\u600e\u4e48\u83b7\u53d6\uff0c\u6587\u5b57\u7684Div\u9ad8\u5ea6\u90fd\u662f0\uff1b\u4f46\u662f\u76f4\u63a5\u83b7\u53d6\u5374\u662f\u6709\u503c\uff1a<\/p>\n\n\n\n
\"problem.png\"\/<\/figure>\n\n\n\n
\u2003\u2003\u540c\u6837\u7684\u60c5\u51b5\u4e5f\u53d1\u751f\u5728\u7ed9\u5b50\u7ec4\u4ef6\u4f20\u53c2\u4e0a\uff1b\u6211\u4eec\u7ed9\u5b50\u7ec4\u4ef6\u4f20\u53c2\u6570\u540e\uff0c\u5728\u5b50\u7ec4\u4ef6\u4e2d\u8c03\u7528\u51fd\u6570\u67e5\u770b\u53c2\u6570\u3002<\/p>\n\n\n\n
<div id=\"app\">\n    <div class=\"msg\">\n        <form-report ref=\"child\" :name=\"childName\"><\/form-report>\n    <\/div>\n<\/div>\nVue.component('form-report', {\n    props: ['name'],\n    methods: {\n        showName(){\n            console.log('\u5b50\u7ec4\u4ef6name\uff1a'+this.name)\n        }\n    },\n    template: '<div>{{name}}<\/div>'\n})\nnew Vue({\n    el: '#app',\n    data: function(){\n        return {\n            childName: '',\n        }\n    },\n    mounted(){\n        this.childName = '\u6211\u662f\u5b50\u7ec4\u4ef6\u540d\u5b57'\n        this.$refs.child.showName()\n    }\n})\n\u590d\u5236\u4ee3\u7801<\/code><\/pre>\n\n\n\n
\u2003\u2003\u867d\u7136\u9875\u9762\u4e0a\u5c55\u793a\u4e86\u5b50\u7ec4\u4ef6\u7684name\uff0c\u4f46\u662f\u6253\u5370\u51fa\u6765\u5374\u662f\u7a7a\u503c\uff1a<\/p>\n\n\n\n
\"problem1.png\"\/<\/figure>\n\n\n\n
\u5f02\u6b65\u66f4\u65b0<\/h1>\n\n\n\n
\u2003\u2003\u6211\u4eec\u53d1\u73b0\u4e0a\u8ff0\u4e24\u4e2a\u95ee\u9898\u7684\u53d1\u751f\uff0c\u4e0d\u7ba1\u5b50\u7ec4\u4ef6\u8fd8\u662f\u7236\u7ec4\u4ef6\uff0c\u90fd\u662f\u5728\u7ed9data<\/code>\u4e2d\u8d4b\u503c\u540e\u7acb\u9a6c\u53bb\u67e5\u770b\u6570\u636e\u5bfc\u81f4\u7684\u3002\u7531\u4e8e\u201c\u67e5\u770b\u6570\u636e\u201d\u8fd9\u4e2a\u52a8\u4f5c\u662f\u540c\u6b65\u64cd\u4f5c\u7684\uff0c\u800c\u4e14\u90fd\u662f\u5728\u8d4b\u503c\u4e4b\u540e\uff1b\u56e0\u6b64\u6211\u4eec\u731c\u6d4b\u4e00\u4e0b\uff0c\u7ed9\u6570\u636e\u8d4b\u503c\u64cd\u4f5c\u662f\u4e00\u4e2a\u5f02\u6b65\u64cd\u4f5c\uff0c\u5e76\u6ca1\u6709\u9a6c\u4e0a\u6267\u884c\uff0cVue\u5b98\u7f51\u5bf9\u6570\u636e\u64cd\u4f5c\u662f\u8fd9\u4e48\u63cf\u8ff0\u7684\uff1a<\/p>\n\n\n\n
\u53ef\u80fd\u4f60\u8fd8\u6ca1\u6709\u6ce8\u610f\u5230\uff0cVue \u5728\u66f4\u65b0 DOM \u65f6\u662f\u5f02\u6b65\u6267\u884c\u7684\u3002\u53ea\u8981\u4fa6\u542c\u5230\u6570\u636e\u53d8\u5316\uff0cVue \u5c06\u5f00\u542f\u4e00\u4e2a\u961f\u5217\uff0c\u5e76\u7f13\u51b2\u5728\u540c\u4e00\u4e8b\u4ef6\u5faa\u73af\u4e2d\u53d1\u751f\u7684\u6240\u6709\u6570\u636e\u53d8\u66f4\u3002\u5982\u679c\u540c\u4e00\u4e2a watcher \u88ab\u591a\u6b21\u89e6\u53d1\uff0c\u53ea\u4f1a\u88ab\u63a8\u5165\u5230\u961f\u5217\u4e2d\u4e00\u6b21\u3002\u8fd9\u79cd\u5728\u7f13\u51b2\u65f6\u53bb\u9664\u91cd\u590d\u6570\u636e\u5bf9\u4e8e\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u8ba1\u7b97\u548c DOM \u64cd\u4f5c\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u7136\u540e\uff0c\u5728\u4e0b\u4e00\u4e2a\u7684\u4e8b\u4ef6\u5faa\u73af\u201ctick\u201d\u4e2d\uff0cVue \u5237\u65b0\u961f\u5217\u5e76\u6267\u884c\u5b9e\u9645 (\u5df2\u53bb\u91cd\u7684) \u5de5\u4f5c\u3002Vue \u5728\u5185\u90e8\u5bf9\u5f02\u6b65\u961f\u5217\u5c1d\u8bd5\u4f7f\u7528\u539f\u751f\u7684 Promise.then\u3001MutationObserver \u548c setImmediate\uff0c\u5982\u679c\u6267\u884c\u73af\u5883\u4e0d\u652f\u6301\uff0c\u5219\u4f1a\u91c7\u7528 setTimeout(fn, 0) \u4ee3\u66ff\u3002<\/p><\/blockquote>\n\n\n\n
\u2003\u2003\u4e5f\u5c31\u662f\u8bf4\u6211\u4eec\u5728\u8bbe\u7f6ethis.msg = 'some thing'<\/code>\u7684\u65f6\u5019\uff0cVue\u5e76\u6ca1\u6709\u9a6c\u4e0a\u53bb\u66f4\u65b0DOM\u6570\u636e\uff0c\u800c\u662f\u5c06\u8fd9\u4e2a\u64cd\u4f5c\u653e\u8fdb\u4e00\u4e2a\u961f\u5217\u4e2d\uff1b\u5982\u679c\u6211\u4eec\u91cd\u590d\u6267\u884c\u7684\u8bdd\uff0c\u961f\u5217\u8fd8\u4f1a\u8fdb\u884c\u53bb\u91cd\u64cd\u4f5c\uff1b\u7b49\u5f85\u540c\u4e00\u4e8b\u4ef6\u5faa\u73af\u4e2d<\/strong>\u7684\u6240\u6709\u6570\u636e\u53d8\u5316\u5b8c\u6210\u4e4b\u540e\uff0c\u4f1a\u5c06\u961f\u5217\u4e2d\u7684\u4e8b\u4ef6\u62ff\u51fa\u6765\u5904\u7406\u3002<\/p>\n\n\n\n
\u2003\u2003\u8fd9\u6837\u505a\u4e3b\u8981\u662f\u4e3a\u4e86\u63d0\u5347\u6027\u80fd\uff0c\u56e0\u4e3a\u5982\u679c\u5728\u4e3b\u7ebf\u7a0b\u4e2d\u66f4\u65b0DOM\uff0c\u5faa\u73af100\u6b21\u5c31\u8981\u66f4\u65b0100\u6b21DOM\uff1b\u4f46\u662f\u5982\u679c\u7b49\u4e8b\u4ef6\u5faa\u73af\u5b8c\u6210\u4e4b\u540e\u66f4\u65b0DOM\uff0c\u53ea\u9700\u8981\u66f4\u65b01\u6b21\u3002\u8fd8\u4e0d\u4e86\u89e3\u4e8b\u4ef6\u5faa\u73af\u7684\u7ae5\u978b\uff0c\u53ef\u4ee5\u770b\u6211\u7684\u53e6\u4e00\u7bc7\u6587\u7ae0\u4ece\u4e00\u9053\u9762\u8bd5\u9898\u6765\u7406\u89e3JS\u4e8b\u4ef6\u5faa\u73af<\/a><\/p>\n\n\n\n
\u2003\u2003\u4e3a\u4e86\u5728\u6570\u636e\u66f4\u65b0\u64cd\u4f5c\u4e4b\u540e\u64cd\u4f5cDOM\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u6570\u636e\u53d8\u5316\u4e4b\u540e\u7acb\u5373\u4f7f\u7528Vue.nextTick(callback)<\/code>\uff1b\u8fd9\u6837\u56de\u8c03\u51fd\u6570\u4f1a\u5728DOM\u66f4\u65b0\u5b8c\u6210\u540e\u88ab\u8c03\u7528\uff0c\u5c31\u53ef\u4ee5\u62ff\u5230\u6700\u65b0\u7684DOM\u5143\u7d20\u4e86\u3002<\/p>\n\n\n\n
\/\/\u7b2c\u4e00\u4e2ademo\nthis.msg = '\u6211\u662f\u6d4b\u8bd5\u6587\u5b57'\nthis.$nextTick(()=>{\n    \/\/20\n    console.log(document.querySelector('.msg').offsetHeight)\n})\n\/\/\u7b2c\u4e8c\u4e2ademo\nthis.childName = '\u6211\u662f\u5b50\u7ec4\u4ef6\u540d\u5b57'\nthis.$nextTick(()=>{\n    \/\/\u5b50\u7ec4\u4ef6name\uff1a\u6211\u662f\u5b50\u7ec4\u4ef6\u540d\u5b57\n    this.$refs.child.showName()\n})\n\u590d\u5236\u4ee3\u7801<\/code><\/pre>\n\n\n\n
nextTick\u6e90\u7801\u5206\u6790<\/h1>\n\n\n\n
\u2003\u2003\u4e86\u89e3\u4e86nextTick\u7684\u7528\u6cd5\u548c\u539f\u7406\u4e4b\u540e\uff0c\u6211\u4eec\u5c31\u6765\u770b\u4e00\u4e0bVue\u662f\u600e\u4e48\u6765\u5b9e\u73b0\u8fd9\u6ce2\u201c\u64cd\u4f5c\u201d\u7684\u3002<\/p>\n\n\n\n
\"opt.jpg\"\/<\/figure>\n\n\n\n
\u2003\u2003Vue\u628anextTick\u7684\u6e90\u7801\u5355\u72ec\u62bd\u5230\u4e00\u4e2a\u6587\u4ef6\u4e2d\uff0c\/src\/core\/util\/next-tick.js<\/code>\uff0c\u5220\u6389\u6ce8\u91ca\u4e5f\u5c31\u5927\u6982\u516d\u4e03\u5341\u884c\u7684\u6837\u5b50\uff0c\u8ba9\u6211\u4eec\u9010\u6bb5\u6765\u5206\u6790\u3002<\/p>\n\n\n\n
const callbacks = []\nlet pending = false\nlet timerFunc\n\nexport function nextTick (cb?: Function, ctx?: Object) {\n  let _resolve\n  callbacks.push(() => {\n    if (cb) {\n      try {\n        cb.call(ctx)\n      } catch (e) {\n        handleError(e, ctx, 'nextTick')\n      }\n    } else if (_resolve) {\n      _resolve(ctx)\n    }\n  })\n  if (!pending) {\n    pending = true\n    timerFunc()\n  }\n  \/\/ $flow-disable-line\n  if (!cb && typeof Promise !== 'undefined') {\n    return new Promise(resolve => {\n      _resolve = resolve\n    })\n  }\n}\n\u590d\u5236\u4ee3\u7801<\/code><\/pre>\n\n\n\n
\u2003\u2003\u6211\u4eec\u9996\u5148\u627e\u5230nextTick<\/code>\u8fd9\u4e2a\u51fd\u6570\u5b9a\u4e49\u7684\u5730\u65b9\uff0c\u770b\u770b\u5b83\u5177\u4f53\u505a\u4e86\u4ec0\u4e48\u64cd\u4f5c\uff1b\u770b\u5230\u5b83\u5728\u5916\u5c42\u5b9a\u4e49\u4e86\u4e09\u4e2a\u53d8\u91cf\uff0c\u6709\u4e00\u4e2a\u53d8\u91cf\u770b\u540d\u5b57\u5c31\u5f88\u719f\u6089\uff1acallbacks\uff0c\u5c31\u662f\u6211\u4eec\u4e0a\u9762\u8bf4\u7684\u961f\u5217\uff1b\u5728nextTick\u7684\u5916\u5c42\u5b9a\u4e49\u53d8\u91cf\u5c31\u5f62\u6210\u4e86\u4e00\u4e2a\u95ed\u5305\uff0c\u6240\u4ee5\u6211\u4eec\u6bcf\u6b21\u8c03\u7528$nextTick\u7684\u8fc7\u7a0b\u5176\u5b9e\u5c31\u662f\u5728\u5411callbacks\u65b0\u589e\u56de\u8c03\u51fd\u6570\u7684\u8fc7\u7a0b\u3002<\/p>\n\n\n\n
\u2003\u2003callbacks\u65b0\u589e\u56de\u8c03\u51fd\u6570\u540e\u53c8\u6267\u884c\u4e86timerFunc\u51fd\u6570\uff0cpending<\/code>\u7528\u6765\u6807\u8bc6\u540c\u4e00\u4e2a\u65f6\u95f4\u53ea\u80fd\u6267\u884c\u4e00\u6b21\u3002\u90a3\u4e48\u8fd9\u4e2atimerFunc\u51fd\u6570\u662f\u505a\u4ec0\u4e48\u7528\u7684\u5462\uff0c\u6211\u4eec\u7ee7\u7eed\u6765\u770b\u4ee3\u7801\uff1a<\/p>\n\n\n\n
export let isUsingMicroTask = false\nif (typeof Promise !== 'undefined' && isNative(Promise)) {\n  \/\/\u5224\u65ad1\uff1a\u662f\u5426\u539f\u751f\u652f\u6301Promise\n  const p = Promise.resolve()\n  timerFunc = () => {\n    p.then(flushCallbacks)\n    if (isIOS) setTimeout(noop)\n  }\n  isUsingMicroTask = true\n} else if (!isIE && typeof MutationObserver !== 'undefined' && (\n  isNative(MutationObserver) ||\n  MutationObserver.toString() === '[object MutationObserverConstructor]'\n)) {\n  \/\/\u5224\u65ad2\uff1a\u662f\u5426\u539f\u751f\u652f\u6301MutationObserver\n  let counter = 1\n  const observer = new MutationObserver(flushCallbacks)\n  const textNode = document.createTextNode(String(counter))\n  observer.observe(textNode, {\n    characterData: true\n  })\n  timerFunc = () => {\n    counter = (counter + 1) % 2\n    textNode.data = String(counter)\n  }\n  isUsingMicroTask = true\n} else if (typeof setImmediate !== 'undefined' && isNative(setImmediate)) {\n  \/\/\u5224\u65ad3\uff1a\u662f\u5426\u539f\u751f\u652f\u6301setImmediate\n  timerFunc = () => {\n    setImmediate(flushCallbacks)\n  }\n} else {\n  \/\/\u5224\u65ad4\uff1a\u4e0a\u9762\u90fd\u4e0d\u884c\uff0c\u76f4\u63a5\u7528setTimeout\n  timerFunc = () => {\n    setTimeout(flushCallbacks, 0)\n  }\n}\n\u590d\u5236\u4ee3\u7801<\/code><\/pre>\n\n\n\n
\u2003\u2003\u8fd9\u91cc\u51fa\u73b0\u4e86\u597d\u51e0\u4e2aisNative<\/code>\u51fd\u6570\uff0c\u8fd9\u662f\u7528\u6765\u5224\u65ad\u6240\u4f20\u53c2\u6570\u662f\u5426\u5728\u5f53\u524d\u73af\u5883\u539f\u751f\u5c31\u652f\u6301\uff1b\u4f8b\u5982\u67d0\u4e9b\u6d4f\u89c8\u5668\u4e0d\u652f\u6301Promise\uff0c\u867d\u7136\u6211\u4eec\u4f7f\u7528\u4e86\u57ab\u7247(polify)\uff0c\u4f46\u662fisNative(Promise)\u8fd8\u662f\u4f1a\u8fd4\u56defalse\u3002<\/p>\n\n\n\n
\u2003\u2003\u53ef\u4ee5\u770b\u51fa\u8fd9\u8fb9\u4ee3\u7801\u5176\u5b9e\u662f\u505a\u4e86\u56db\u4e2a\u5224\u65ad\uff0c\u5bf9\u5f53\u524d\u73af\u5883\u8fdb\u884c\u4e0d\u65ad\u7684\u964d\u7ea7\u5904\u7406\uff0c\u5c1d\u8bd5\u4f7f\u7528\u539f\u751f\u7684Promise.then<\/code>\u3001MutationObserver<\/code>\u548csetImmediate<\/code>\uff0c\u4e0a\u8ff0\u4e09\u4e2a\u90fd\u4e0d\u652f\u6301\u6700\u540e\u4f7f\u7528setTimeout\uff1b\u964d\u7ea7\u5904\u7406\u7684\u76ee\u7684\u90fd\u662f\u5c06flushCallbacks<\/code>\u51fd\u6570\u653e\u5165\u5fae\u4efb\u52a1(\u5224\u65ad1\u548c\u5224\u65ad2)\u6216\u8005\u5b8f\u4efb\u52a1(\u5224\u65ad3\u548c\u5224\u65ad4)\uff0c\u7b49\u5f85\u4e0b\u4e00\u6b21\u4e8b\u4ef6\u5faa\u73af\u65f6\u6765\u6267\u884c\u3002MutationObserver<\/code>\u662fHtml5\u7684\u4e00\u4e2a\u65b0\u7279\u6027\uff0c\u7528\u6765\u76d1\u542c\u76ee\u6807DOM\u7ed3\u6784\u662f\u5426\u6539\u53d8\uff0c\u4e5f\u5c31\u662f\u4ee3\u7801\u4e2d\u65b0\u5efa\u7684textNode\uff1b\u5982\u679c\u6539\u53d8\u4e86\u5c31\u6267\u884cMutationObserver\u6784\u9020\u51fd\u6570\u4e2d\u7684\u56de\u8c03\u51fd\u6570\uff0c\u4e0d\u8fc7\u662f\u5b83\u662f\u5728\u5fae\u4efb\u52a1\u4e2d\u6267\u884c\u7684\u3002<\/p>\n\n\n\n
\u2003\u2003\u90a3\u4e48\u6700\u7ec8\u6211\u4eec\u987a\u85e4\u6478\u74dc\u627e\u5230\u4e86\u6700\u7ec8\u7684\u5927boss\uff1aflushCallbacks\uff1bnextTick\u4e0d\u987e\u4e00\u5207\u7684\u8981\u628a\u5b83\u653e\u5165\u5fae\u4efb\u52a1\u6216\u8005\u5b8f\u4efb\u52a1\u4e2d\u53bb\u6267\u884c\uff0c\u5b83\u7a76\u7adf\u662f\u4f55\u65b9\u795e\u5723\u5462\uff1f\u8ba9\u6211\u4eec\u6765\u4e00\u7779\u5b83\u7684\u771f\u5bb9\uff1a<\/p>\n\n\n\n
function flushCallbacks () {\n  pending = false\n  const copies = callbacks.slice(0)\n  callbacks.length = 0\n  for (let i = 0; i < copies.length; i++) {\n    copies[i]()\n  }\n}\n\u590d\u5236\u4ee3\u7801<\/code><\/pre>\n\n\n\n
\u2003\u2003\u672c\u6765\u4ee5\u4e3a\u6709\u591a\u590d\u6742\u7684flushCallbacks\uff0c\u5c45\u7136\u4e0d\u8fc7\u77ed\u77ed\u76848\u884c\u3002\u5b83\u6240\u505a\u7684\u4e8b\u60c5\u4e5f\u975e\u5e38\u7684\u7b80\u5355\uff0c\u628acallbacks\u6570\u7ec4\u590d\u5236\u4e00\u4efd\uff0c\u7136\u540e\u628acallbacks\u7f6e\u4e3a\u7a7a\uff0c\u6700\u540e\u628a\u590d\u5236\u51fa\u6765\u7684\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u51fd\u6570\u4f9d\u6b21\u6267\u884c\u4e00\u904d\uff1b\u6240\u4ee5\u5b83\u7684\u4f5c\u7528\u4ec5\u4ec5\u662f\u7528\u6765\u6267\u884ccallbacks\u4e2d\u7684\u56de\u8c03\u51fd\u6570\u3002<\/p>\n\n\n\n
\u603b\u7ed3<\/h1>\n\n\n\n
\u2003\u2003\u5230\u8fd9\u91cc\uff0c\u6574\u4f53nextTick\u7684\u4ee3\u7801\u90fd\u5206\u6790\u5b8c\u6bd5\u4e86\uff0c\u603b\u7ed3\u4e00\u4e0b\u5b83\u7684\u6d41\u7a0b\u5c31\u662f\uff1a<\/p>\n\n\n\n
  1. \u628a\u56de\u8c03\u51fd\u6570\u653e\u5165callbacks\u7b49\u5f85\u6267\u884c<\/li>
  2. \u5c06\u6267\u884c\u51fd\u6570\u653e\u5230\u5fae\u4efb\u52a1\u6216\u8005\u5b8f\u4efb\u52a1\u4e2d<\/li>
  3. \u4e8b\u4ef6\u5faa\u73af\u5230\u4e86\u5fae\u4efb\u52a1\u6216\u8005\u5b8f\u4efb\u52a1\uff0c\u6267\u884c\u51fd\u6570\u4f9d\u6b21\u6267\u884ccallbacks\u4e2d\u7684\u56de\u8c03<\/li><\/ol>\n\n\n\n
    \u2003\u2003\u518d\u56de\u5230\u6211\u4eec\u5f00\u5934\u8bf4\u7684setTimeout\uff0c\u53ef\u4ee5\u770b\u51fa\u6765nextTick\u662f\u5bf9setTimeout\u8fdb\u884c\u4e86\u591a\u79cd\u517c\u5bb9\u6027\u7684\u5904\u7406\uff0c\u5bbd\u6cdb\u7684\u4e5f\u53ef\u4ee5\u7406\u89e3\u4e3a\u5c06\u56de\u8c03\u51fd\u6570\u653e\u5165setTimeout\u4e2d\u6267\u884c\uff1b\u4e0d\u8fc7nextTick\u4f18\u5148\u653e\u5165\u5fae\u4efb\u52a1\u6267\u884c\uff0c\u800csetTimeout\u662f\u5b8f\u4efb\u52a1\uff0c\u56e0\u6b64nextTick\u4e00\u822c\u60c5\u51b5\u4e0b\u603b\u662f\u5148\u4e8esetTimeout\u6267\u884c\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u6d4f\u89c8\u5668\u4e2d\u5c1d\u8bd5\u4e00\u4e0b\uff1a<\/p>\n\n\n\n
    setTimeout(()=>{\n    console.log(1)\n}, 0)\nthis.$nextTick(()=>{\n    console.log(2)\n})\nthis.$nextTick(()=>{\n    console.log(3)\n})\n\/\/\u8fd0\u884c\u7ed3\u679c 2 3 1\n\u590d\u5236\u4ee3\u7801<\/code><\/pre>\n\n\n\n
    \u2003\u2003\u6700\u540e\u9a8c\u8bc1\u731c\u60f3\uff0c\u5f53\u524d\u5b8f\u4efb\u52a1\u6267\u884c\u5b8c\u6210\u540e\uff0c\u4f18\u5148\u6267\u884c\u4e24\u4e2a\u5fae\u4efb\u52a1\uff0c\u6700\u540e\u518d\u6267\u884c\u5b8f\u4efb\u52a1\u3002<\/p>\n\n\n\n

    \u4f5c\u8005\uff1a\u8c22\u5c0f\u98de
    \u94fe\u63a5\uff1ahttps:\/\/juejin.cn\/post\/6844904147804749832
    \u6765\u6e90\uff1a\u7a00\u571f\u6398\u91d1
    \u8457\u4f5c\u6743\u5f52\u4f5c\u8005\u6240\u6709\u3002\u5546\u4e1a\u8f6c\u8f7d\u8bf7\u8054\u7cfb\u4f5c\u8005\u83b7\u5f97\u6388\u6743\uff0c\u975e\u5546\u4e1a\u8f6c\u8f7d\u8bf7\u6ce8\u660e\u51fa\u5904\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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