{"id":389,"date":"2022-06-30T12:02:37","date_gmt":"2022-06-30T04:02:37","guid":{"rendered":"https:\/\/blog.osvlabs.com\/?p=389"},"modified":"2022-06-30T12:09:03","modified_gmt":"2022-06-30T04:09:03","slug":"%e4%b8%ba%e4%bb%80%e4%b9%88%e5%9c%a8react-%e4%b8%adsetstate-%e6%98%af%e5%bc%82%e6%ad%a5%e7%9a%84","status":"publish","type":"post","link":"https:\/\/blog.osvlabs.com\/?p=389","title":{"rendered":"\u4e3a\u4ec0\u4e48\u5728React \u4e2dsetState \u662f\u201c\u5f02\u6b65\u201d\u7684"},"content":{"rendered":"<h2>\u524d\u8a00<\/h2>\n<p>\u5bf9\u4e8e\u719f\u6089\u5176\u4ed6\u6846\u67b6\u4f46\u9996\u6b21\u4f7f\u7528React \u7684\u521d\u5b66\u8005\u800c\u8a00\uff0c\u4f1a\u53d1\u73b0\u4e00\u4e2a\u5947\u602a\u7684\u95ee\u9898\uff1asetState\uff08class \u4e2d\u4f7f\u7528this.setState \u6216 \u5728hooks \u4e2d\u4f7f\u7528setState function\uff09\u88ab\u8c03\u7528\u4e4b\u540e\uff0c\u53bb\u83b7\u53d6state \u7684\u503c\u4ecd\u7136\u6ca1\u6709\u53d1\u751f\u6539\u53d8\uff0c\u4f46\u6709\u65f6\u5019\uff0c\u8c03\u7528setState \u540e\u8bbf\u95eestate \u503c\u65f6\u53c8\u4f1a\u53d1\u73b0state \u503c\u4f1a\u7acb\u5373\u88ab\u66f4\u65b0\uff08\u6bd4\u5982\u5728React 16 \u4e2d\u5728setTimeout \u5185\u4f7f\u7528setState\uff09\u3002<\/p>\n<p>\u8fd9\u4e00\u70b9\u4f1a\u8ba9\u4eba\u975e\u5e38\u56f0\u60d1\uff0c\u751a\u81f3\u8fd8\u884d\u751f\u51fa\u4e86\u9762\u8bd5\u9898\uff1a<a href=\"https:\/\/juejin.cn\/post\/6844904090355367943\">\u9ad8\u9891\u9762\u8bd5\u9898\uff1asetState\u662f\u540c\u6b65\u8fd8\u662f\u5f02\u6b65<\/a>\u3002<\/p>\n<p>\u8fd9\u91cc\u7684\u5f02\u6b65\u53ea\u662f\u6982\u5ff5\u4e0a\u7684\u5f02\u6b65\uff0c\u7528\u6765\u8868\u793astate \u6ca1\u6709\u7acb\u5373\u66f4\u65b0\u7684\u610f\u601d\u3002\u4e8b\u5b9e\u4e0asetState \u5f53\u7136\u662f\u540c\u6b65\u8c03\u7528\u3002<\/p>\n<h2>\u9020\u6210\u8fd9\u79cd\u73b0\u8c61\u7684\u539f\u56e0<\/h2>\n<p>\u8fd9\u4e2a\u95ee\u9898\u7684\u539f\u56e0\uff0c\u4e0d\u4ec5\u56f0\u6270\u7740\u8bf8\u591a\u5f00\u53d1\u8005\uff0c\u8fde\u5468\u8fb9\u751f\u6001\u5e93\u7684\u4f5c\u8005\u4e5f\u5f88\u7591\u60d1\u3002<\/p>\n<p>Mobx \u7684\u4f5c\u8005Michel Weststrate \u572817\u5e74\u5c31\u5728React \u4ed3\u5e93\u63d0\u4e86<a href=\"https:\/\/github.com\/facebook\/react\/issues\/11527\">issue<\/a>, \u8fd9\u4e2a\u95ee\u9898\u4e5f\u5f97\u5230\u4e86React \u6838\u5fc3\u6210\u5458Dan Abramov \u7684\u89e3\u7b54\u3002<\/p>\n<p>\u82f1\u6587\u597d\u7684\u540c\u5b66\u53ef\u4ee5\u76f4\u63a5\u9605\u8bfbissue, \u82f1\u6587\u4e0d\u592a\u597d\u7684\u540c\u5b66\u53ef\u4ee5\u9605\u8bfb <a href=\"https:\/\/segmentfault.com\/a\/1190000013040438\">\u8fd9\u91cc<\/a>\u3002<\/p>\n<p>\u6216\u8005\u53ef\u4ee5\u770b\u4e00\u770b\u6587\u6863\u5bf9\u4e0estate \u7684\u4ecb\u7ecd\uff1a<\/p>\n<ul>\n<li><a href=\"https:\/\/reactjs.org\/docs\/faq-state.html#when-is-setstate-asynchronous\">\u82f1\u6587<\/a><\/li>\n<li><a href=\"https:\/\/zh-hans.reactjs.org\/docs\/faq-state.html\">\u4e2d\u6587<\/a><\/li>\n<\/ul>\n<p>\u8fd9\u91cc\u518d\u7b80\u5355\u603b\u7ed3\u4e00\u4e0b\u8fd9\u6837\u505a\u7684\u539f\u56e0:<\/p>\n<ol>\n<li>\u6279\u5904\u7406\u66f4\u65b0\u662f\u5fc5\u8981\u7684\uff0c\u5373render \u5e76\u975e\u662f\u5728\u72b6\u6001\u66f4\u65b0\u5c31\u8fdb\u884c\uff0c\u800c\u662f\u7b49\u5f85\u6240\u6709\u72b6\u6001\u90fd\u66f4\u65b0\u5b8c\u6210\u518d\u8fdb\u884crender\uff0c\u8fd9\u4e00\u5468\u671f\u5185\u53earender\u4e00\u6b21\u3002\uff08vue \u4e5f\u6709\u7c7b\u4f3c\u7684\u673a\u5236\uff0c\u6bd4\u5982nextTick)<\/li>\n<li>\u6211\u4eec\u53ef\u4ee5\u9009\u62e9\u8ba9setState \u7acb\u5373\u66f4\u65b0state\uff0c\u4f46\u4e00\u4e9b\u539f\u56e0\u8ba9\u6211\u4eec\u6ca1\u6709\u9009\u62e9\u8fd9\u6837\u7684\u65b9\u6848\uff1a<br \/>\na. \u4fdd\u6301\u72b6\u6001\u7684\u4e00\u81f4\u6027\uff0c\u8ba9props\u3001state\u3001ref \u4fdd\u6301\u4e00\u81f4<br \/>\nb. \u5982\u679cstate \u7acb\u5373\u66f4\u65b0\u4e86\uff0cConcurrent Render \u5c31\u65e0\u6cd5\u8fdb\u884c\u4e86\uff0c\u56e0\u4e3a\u5b83\u5c31\u662f\u8981\u53bb\u5bf9\u6240\u6709\u7684render \u8fdb\u884c\u8c03\u5ea6<\/li>\n<\/ol>\n<p>\u6279\u5904\u7406\u66f4\u65b0 (batchUpdates) \u5f88\u5bb9\u6613\u7406\u89e3\uff0c\u4f46\u5173\u4e8e\u4e3a\u4ec0\u4e48\u6ca1\u6709\u9009\u62e9\u7acb\u5373\u66f4\u65b0\uff0c\u6211\u89c9\u5f97\u6211\u6709\u5fc5\u8981\u518d\u5448\u4e0a\u4e00\u70b9\u6d45\u89c1\u3002<\/p>\n<h3>\u72b6\u6001\u4fdd\u6301\u4e00\u81f4<\/h3>\n<p>\u72b6\u6001\u4fdd\u6301\u4e00\u81f4\u662f\u975e\u5e38\u6709\u5fc5\u8981\u7684\uff0c\u8bd5\u60f3\u4e00\u4e0b\u5f53\u7236\u7ec4\u4ef6\u4e0e\u5b50\u7ec4\u4ef6\u5bf9\u4e8e\u540c\u4e00\u503c\u53d6\u5230\u7684\u6570\u636e\u4e0d\u4e00\u81f4\u662f\u6709\u591a\u4e48\u7684\u5272\u88c2\uff1f<\/p>\n<p>\u5728react \u4e2d\uff0c\u66f4\u65b0props \u7684\u552f\u4e00\u65b9\u5f0f\u5c31\u662f\u7236\u7ec4\u4ef6\u7684\u91cd\u65b0render\uff0c\u6240\u4ee5\u8981\u72b6\u6001\u4fdd\u6301\u4e00\u81f4\u7684\u8bdd\u5c31\u5fc5\u987b\u5728state \u66f4\u65b0\u65f6\u91cd\u65b0\u53bbrender \u7ec4\u4ef6\u3002<\/p>\n<p>\u800c\u5bf9\u4e8erender \u6765\u8bf4\uff0cBatch update \u662f\u6846\u67b6\u8bbe\u8ba1\u8005\u5fc5\u987b\u8003\u8651\u7684\u65b9\u6848\uff0c\u8fd9\u6837\u53ef\u4ee5\u5927\u5e45\u51cf\u5c11\u65e0\u7528\u7684render \u53ca\u64cd\u4f5c\u771f\u5b9eDOM \u7684\u6b21\u6570\u3002\u53c2\u8003\u4ee5\u4e0a\u6761\u4ef6\uff0c\u7acb\u5373\u66f4\u65b0state \u4e0eprops \u5c31\u65e0\u6cd5\u4f7f\u7528Batch update\u3002\u6240\u4ee5Vue \u4e5f\u6709\u7c7b\u4f3cBatch update\u7684\u673a\u5236\uff0cVue \u79f0\u5176\u4e3a<a href=\"https:\/\/cn.vuejs.org\/v2\/guide\/reactivity.html#%E5%BC%82%E6%AD%A5%E6%9B%B4%E6%96%B0%E9%98%9F%E5%88%97\">\u5f02\u6b65\u66f4\u65b0\u961f\u5217<\/a>\u3002<\/p>\n<p>\u540c\u6837\u7684\uff0cVue \u5728\u5b50\u7ec4\u4ef6\u66f4\u65b0\u7236\u7ec4\u4ef6\u4f20\u8fc7\u6765\u7684\u503c\u65f6\uff0c\u4e5f\u5e76\u975e\u662f\u7acb\u5373\u66f4\u65b0\u7684\uff0c\u548creact \u9700\u8981\u4fdd\u6301\u72b6\u6001\u4e00\u81f4\u7684\u539f\u56e0\u5927\u81f4\u76f8\u4f3c\u3002<\/p>\n<p>Vue \u7684\u793a\u4f8b\u53ef\u89c1\u8fd9\u4e2a<a href=\"https:\/\/codepen.io\/hnsxxscyx\/pen\/ZExERpQ\">demo<\/a>\uff0c\u9700\u8981\u6253\u5f00log \u6216\u6d4f\u89c8\u5668\u63a7\u5236\u53f0\uff0c\u70b9\u51fb\u6587\u5b57\u53ef\u4ee5\u770b\u5230props \u7684\u66f4\u65b0\u4e5f\u5e76\u975e\u4e00\u81f4\u7684\uff1a<\/p>\n<p><iframe height=\"300\" style=\"width: 100%;\" scrolling=\"no\" title=\"vue component $emit\" src=\"https:\/\/codepen.io\/hnsxxscyx\/embed\/ZExERpQ?default-tab=html%2Cresult\" frameborder=\"no\" loading=\"lazy\" allowtransparency=\"true\" allowfullscreen=\"true\"><br \/>\n  See the Pen <a href=\"https:\/\/codepen.io\/hnsxxscyx\/pen\/ZExERpQ\"><br \/>\n  vue component $emit<\/a> by \u4e0d\u5f97\u4e0d\u9519 (<a href=\"https:\/\/codepen.io\/hnsxxscyx\">@hnsxxscyx<\/a>)<br \/>\n  on <a href=\"https:\/\/codepen.io\">CodePen<\/a>.<br \/>\n<\/iframe><\/p>\n<p><img src=\"https:\/\/blog.osvlabs.com\/wp-content\/uploads\/2022\/06\/QQ20220630-120410@2x.png \" alt=\"log\" width=\"150\"><\/img><\/p>\n<h3>\u4e3a\u4ec0\u4e48Concurrent Render \u4e2d\u4e0d\u80fd\u7acb\u5373\u66f4\u65b0\u503c<\/h3>\n<p>\u5728Concurrent Render \u4e0b\uff0c\u6240\u6709\u7684state \u66f4\u65b0\u4f1a\u88ab\u8c03\u5ea6\u5668 ( Scheduler ) \u63a5\u7ba1\u3002\u6362\u53e5\u8bdd\u6765\u8bf4\uff0c\u4f60\u53ea\u662f\u6807\u8bb0\u4e86\u8fd9\u4e2a\u72b6\u6001\u4f1a\u88ab\u66f4\u65b0\uff08\u5b9e\u9645react \u4e5f\u53ea\u662f\u7559\u4e0b\u4e86\u4e00\u4e2a\u6807\u8bb0\u8868\u793a\u8fd9\u4e2a\u53d8\u91cf\u5c06\u53d8\u5316\uff09\uff0c\u5b9e\u9645\u4e0a\u4ec0\u4e48\u65f6\u95f4\u8fdb\u884c\u66f4\u65b0\u662f\u7531\u8c03\u5ea6\u5668\u6839\u636e\u4e0d\u540c\u60c5\u51b5\u4e0b\u7684\u4f18\u5148\u7ea7\u6765\u51b3\u5b9a\u7684\uff0c\u8c03\u5ea6\u5668\u751a\u81f3\u4f1a\u8df3\u8fc7\u4f18\u5148\u7ea7\u8f83\u4f4e\u7684\u66f4\u65b0\u6216\u8005\u5c06\u67d0\u4e9b\u5bc6\u96c6\u66f4\u65b0\u901a\u8fc7\u65f6\u95f4\u5206\u7247\u6765\u5206n\u6b21\u6765\u5b8c\u6210\u3002<\/p>\n<p>\u8fd9\u6837\u7684\u8bdd\u66f4\u4e0d\u53ef\u80fd\u7acb\u5373\u62ff\u5230\u66f4\u65b0\u540e\u7684\u503c\u4e86\u3002<\/p>\n<h2>\u4f7f\u7528react \u65f6\uff0c\u6211\u4eec\u5e94\u8be5\u600e\u4e48\u505a<\/h2>\n<p>\u65e0\u8bba\u5de5\u5177\u7684\u4f5c\u8005\u600e\u4e48\u89e3\u91ca\uff0c\u53cd\u76f4\u89c9\u7684\u5c31\u662f\u53cd\u76f4\u89c9\u7684\uff0c\u4f46\u53ea\u8981\u5bf9\u673a\u5236\u719f\u6089\u4e86\uff0c\u7edd\u5927\u591a\u6570\u5f00\u53d1\u8fc7\u7a0b\u4e2d\u6211\u4eec\u90fd\u4e0d\u4f1a\u9047\u5230\u8ba9\u4eba\u56f0\u60d1\u7684\u95ee\u9898\u3002<\/p>\n<p>\u5f53\u4f7f\u7528Class \u7ec4\u4ef6\u65f6\uff0cthis.setState \u65b9\u6cd5\u63d0\u4f9b\u4e86callback \u65b9\u6cd5\uff0c\u7c7b\u4f3c\u4e0eVue \u7684$nextTick\uff0c\u5728callback \u4e2d\u4f60\u53ef\u4ee5\u83b7\u53d6\u5230state \u5df2\u88ab\u66f4\u65b0\u7684\u503c\u3002<\/p>\n<p>\u56f0\u60d1\u5927\u591a\u53d1\u751f\u4e8e\u4f7f\u7528Function \u7ec4\u4ef6\u65f6\uff0cFunction \u7ec4\u4ef6\u7684setState \u65b9\u6cd5\u5e76\u6ca1\u6709\u63d0\u4f9bcallback\uff0c\u56e0\u4e3aFunction \u7ec4\u4ef6\u7684\u526f\u4f5c\u7528\u5e94\u8be5\u4ea4\u7ed9useEffect \u53bb\u5904\u7406\u3002<\/p>\n<p>\u5982\u679c\u771f\u7684\u9047\u5230\u9700\u8981\u7acb\u5373\u62ff\u5230state \u503c\u7684\u60c5\u51b5\uff0c\u8bf7\u6309\u7167\u4ee5\u4e0b\u9010\u6b65\u5904\u7406\u4e00\u4e0b\uff1a<\/p>\n<pre><code>1. \u8fd9\u4e2a\u503c\u662f\u9700\u8981\u653e\u5728state \u4e2d\u6765\u7ef4\u62a4\u7684\u5417\uff1f\uff08\u8fd9\u4e2a\u503c\u4e0eUI \u6709\u5173\u8054\u5417\uff09\n2. \u662f\u5426\u5df2\u7ecf\u786e\u5207\u7684\u77e5\u9053\u65b0state \u7684\u503c\u662f\u4ec0\u4e48\u800c\u76f4\u63a5\u4f7f\u7528\uff1f\n3. \u4f7f\u7528ref \u6765\u4ee3\u66ffstate \u7ba1\u7406\u8fd9\u4e2a\u503c\uff0cref \u662f\u5f15\u7528\u503c\uff0c\u53ef\u4ee5\u8de8\u8d8a\u7ec4\u4ef6\u6e32\u67d3\uff0c\u4fdd\u8bc1\u83b7\u53d6\u5230\u7684\u603b\u662f\u6700\u65b0\u503c\u3002<\/code><\/pre>\n<h2>\u9898\u5916\u8bdd &#8211; \u4e3a\u4ec0\u4e48\u67d0\u4e9b\u72b6\u6001\u7ba1\u7406\u5e93\u7684\u72b6\u6001\u66f4\u6539\u5e76\u4e0d\u662f\u8fd9\u6837\u7684\uff1f 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