{"id":53412,"date":"2024-12-03T12:13:14","date_gmt":"2024-12-03T04:13:14","guid":{"rendered":"https:\/\/fwq.ai\/blog\/53412\/"},"modified":"2024-12-03T12:13:14","modified_gmt":"2024-12-03T04:13:14","slug":"react%e7%bb%84%e4%bb%b6%e6%b8%b2%e6%9f%93%e5%ae%8c%e6%88%90%e5%a6%82%e4%bd%95%e5%ae%89%e5%85%a8%e5%9c%b0%e6%93%8d%e4%bd%9cdom%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/53412\/","title":{"rendered":"React\u7ec4\u4ef6\u6e32\u67d3\u5b8c\u6210\u5982\u4f55\u5b89\u5168\u5730\u64cd\u4f5cDOM\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

React\u7ec4\u4ef6\u6e32\u67d3\u5b8c\u6210\u5982\u4f55\u5b89\u5168\u5730\u64cd\u4f5cDOM\uff1f <\/h1>\n

\u6587\u7ae0<\/span>\u4e0d\u77e5\u9053\u5927\u5bb6\u662f\u5426\u719f\u6089\uff1f\u4eca\u5929\u6211\u5c06\u7ed9\u5927\u5bb6\u4ecb\u7ecd\u300aReact\u7ec4\u4ef6\u6e32\u67d3\u5b8c\u6210\u5982\u4f55\u5b89\u5168\u5730\u64cd\u4f5cDOM\uff1f \u300b<\/span>\uff0c\u8fd9\u7bc7\u6587\u7ae0\u4e3b\u8981\u4f1a\u8bb2\u5230<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u4f60\u5728\u770b\u5b8c\u672c\u7bc7\u6587\u7ae0\u540e\uff0c\u6709\u66f4\u597d\u7684\u5efa\u8bae\u6216\u8005\u53d1\u73b0\u54ea\u91cc\u6709\u95ee\u9898\uff0c\u5e0c\u671b\u5927\u5bb6\u90fd\u80fd\u79ef\u6781\u8bc4\u8bba\u6307\u51fa\uff0c\u8c22\u8c22\uff01\u5e0c\u671b\u6211\u4eec\u80fd\u4e00\u8d77\u52a0\u6cb9\u8fdb\u6b65\uff01<\/p>\n

\"React\u7ec4\u4ef6\u6e32\u67d3\u5b8c\u6210\u5982\u4f55\u5b89\u5168\u5730\u64cd\u4f5cDOM\uff1f\u63d2\u56fe\"<\/p>\n

react \u4e2d\u9875\u9762\u6e32\u67d3\u5b8c\u6210\u7684\u751f\u547d\u5468\u671f<\/strong><\/p>\n

react \u7ec4\u4ef6\u751f\u547d\u5468\u671f\u63d0\u4f9b\u4e86\u51e0\u4e2a\u65b9\u6cd5\u56de\u8c03\uff0c\u5141\u8bb8\u5f00\u53d1\u8005\u5728\u7ec4\u4ef6\u4e0d\u540c\u9636\u6bb5\u6267\u884c\u7279\u5b9a\u7684\u4efb\u52a1\u3002\u9875\u9762\u6e32\u67d3\u5b8c\u6210\u7684\u751f\u547d\u5468\u671f\u662f componentdidmount()<\/strong>\u3002<\/p>\n

\u9875\u9762\u6e32\u67d3\u524d\u540e\u67e5\u8be2 dom<\/strong><\/p>\n

\u5728 componentdidmount()<\/strong> \u5185\u67e5\u8be2 dom \u5143\u7d20\u53ef\u80fd\u5bfc\u81f4\u95ee\u9898\uff0c\u56e0\u4e3a\u6b64\u65f6\u5e76\u975e\u6240\u6709\u5143\u7d20\u90fd\u5df2\u6e32\u67d3\u5230 dom \u4e2d\u3002\u4ee3\u7801\u793a\u4f8b\u4e2d\uff0c\u5c1d\u8bd5\u67e5\u8be2\u7684\u5143\u7d20\u8fd8\u672a\u6e32\u67d3\uff0c\u56e0\u6b64\u51fa\u73b0 cannot read properties of null<\/strong> \u9519\u8bef\u3002<\/p>\n

\u89e3\u51b3\u65b9\u6848<\/strong><\/p>\n

\u89e3\u51b3\u6b64\u95ee\u9898\u7684\u5e38\u89c1\u65b9\u6cd5\u662f\u4f7f\u7528 useeffect<\/strong> \u94a9\u5b50\uff0c\u5b83\u5141\u8bb8\u5728\u7ec4\u4ef6\u7684\u751f\u547d\u5468\u671f\u4e2d\u6267\u884c\u526f\u4f5c\u7528\uff0c\u5305\u62ec\u5728\u7ec4\u4ef6\u88c5\u8f7d\u548c\u66f4\u65b0\u65f6\u66f4\u65b0 dom\u3002useeffect<\/strong> \u94a9\u5b50\u63a5\u53d7\u4e24\u4e2a\u53c2\u6570\uff1a\u4e00\u4e2a\u56de\u8c03\u51fd\u6570\u548c\u4e00\u4e2a\u4f9d\u8d56\u9879\u6570\u7ec4\u3002<\/p>\n

\u4ee5\u4e0b\u662f\u4f7f\u7528 useeffect<\/strong> \u6765\u5ef6\u8fdf\u5bf9 dom \u5143\u7d20\u7684\u67e5\u8be2\u7684\u91cd\u5199\u4ee3\u7801\uff1a<\/p>\n

useEffect(() => {\n  if (props.scrollToIdx) {\n    const scrollToIdx = props.scrollToIdx;\n    setTimeout(() => {\n      const container = document.querySelector(\"#container\");\n      const div: HTMLDivElement | null = document.querySelector(\n        \"#item-\" + scrollToIdx.toString()\n      );\n      \/\/ ... \u64cd\u4f5c\n    }, 100); \/\/ \u5ef6\u8fdf 100 \u6beb\u79d2\u7b49\u5f85\u5143\u7d20\u6e32\u67d3\n  }\n}, [props.scrollToIdx]);<\/pre>\n
\u907f\u514d\u91cd\u590d\u72b6\u6001<\/strong><\/p>\n
\u5728\u7ec4\u4ef6\u4e2d\u4f7f\u7528 usestate<\/strong> \u94a9\u5b50\u65f6\uff0c\u8bf7\u6ce8\u610f\u907f\u514d\u4e0d\u5fc5\u8981\u5730\u4fdd\u5b58\u6570\u636e\u3002\u5728\u5f53\u524d\u793a\u4f8b\u4e2d\uff0cdata \u72b6\u6001\u662f\u591a\u4f59\u7684\uff0c\u56e0\u4e3a\u5b83\u53ef\u4ee5\u901a\u8fc7 props.data \u8bbf\u95ee\u3002\u5220\u9664 data \u72b6\u6001\u5c06\u6709\u52a9\u4e8e\u7b80\u5316\u4ee3\u7801\u5e76\u907f\u514d\u6f5c\u5728\u7684\u9519\u8bef\u3002<\/p>\n
\u4eca\u5929\u5173\u4e8e\u300aReact\u7ec4\u4ef6\u6e32\u67d3\u5b8c\u6210\u5982\u4f55\u5b89\u5168\u5730\u64cd\u4f5cDOM\uff1f \u300b\u7684\u5185\u5bb9\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u4e86\uff0c\u662f\u4e0d\u662f\u5b66\u8d77\u6765\u4e00\u76ee\u4e86\u7136\uff01\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8\u7c73\u4e91\u516c\u4f17\u53f7\uff01<\/p>\n
\n
<\/dt>\n
\n   \u7b14\u8bb0\u672c\u7535\u8111\u600e\u4e48\u91cd\u88c5Win11\u7cfb\u7edf \u6709\u6548\u91cd\u88c5\u7b14\u8bb0\u672cWin11\u7cfb\u7edf\u7684\u65b9\u6cd5\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
React\u7ec4\u4ef6\u6e32\u67d3\u5b8c\u6210\u5982\u4f55\u5b89\u5168\u5730\u64cd\u4f5cDOM\uff1f \u6587\u7ae0\u4e0d\u77e5\u9053\u5927\u5bb6\u662f\u5426\u719f\u6089\uff1f\u4eca\u5929\u6211\u5c06\u7ed9\u5927\u5bb6\u4ecb\u7ecd\u300aReact\u7ec4\u4ef6\u6e32\u67d3\u5b8c\u6210\u5982\u4f55\u5b89\u5168\u5730\u64cd\u4f5cDOM\uff1f \u300b\uff0c\u8fd9\u7bc7\u6587\u7ae0\u4e3b\u8981\u4f1a\u8bb2\u5230\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u4f60\u5728\u770b\u5b8c\u672c\u7bc7\u6587\u7ae0\u540e\uff0c\u6709\u66f4\u597d\u7684\u5efa\u8bae\u6216\u8005\u53d1\u73b0\u54ea\u91cc\u6709\u95ee\u9898\uff0c\u5e0c\u671b\u5927\u5bb6\u90fd\u80fd\u79ef\u6781\u8bc4\u8bba\u6307\u51fa\uff0c\u8c22\u8c22\uff01\u5e0c\u671b\u6211\u4eec\u80fd\u4e00\u8d77\u52a0\u6cb9\u8fdb\u6b65\uff01 react \u4e2d\u9875\u9762\u6e32\u67d3\u5b8c\u6210\u7684\u751f\u547d\u5468\u671f react \u7ec4\u4ef6\u751f\u547d\u5468\u671f\u63d0\u4f9b\u4e86\u51e0\u4e2a\u65b9\u6cd5\u56de\u8c03\uff0c\u5141\u8bb8\u5f00\u53d1\u8005\u5728\u7ec4\u4ef6\u4e0d\u540c\u9636\u6bb5\u6267\u884c\u7279\u5b9a\u7684\u4efb\u52a1\u3002\u9875\u9762\u6e32\u67d3\u5b8c\u6210\u7684\u751f\u547d\u5468\u671f\u662f componentdidmount()\u3002 \u9875\u9762\u6e32\u67d3\u524d\u540e\u67e5\u8be2 dom \u5728 componentdidmount() \u5185\u67e5\u8be2 dom \u5143\u7d20\u53ef\u80fd\u5bfc\u81f4\u95ee\u9898\uff0c\u56e0\u4e3a\u6b64\u65f6\u5e76\u975e\u6240\u6709\u5143\u7d20\u90fd\u5df2\u6e32\u67d3\u5230 dom \u4e2d\u3002\u4ee3\u7801\u793a\u4f8b\u4e2d\uff0c\u5c1d\u8bd5\u67e5\u8be2\u7684\u5143\u7d20\u8fd8\u672a\u6e32\u67d3\uff0c\u56e0\u6b64\u51fa\u73b0 cannot read properties of null \u9519\u8bef\u3002 \u89e3\u51b3\u65b9\u6848 \u89e3\u51b3\u6b64\u95ee\u9898\u7684\u5e38\u89c1\u65b9\u6cd5\u662f\u4f7f\u7528 useeffect \u94a9\u5b50\uff0c\u5b83\u5141\u8bb8\u5728\u7ec4\u4ef6\u7684\u751f\u547d\u5468\u671f\u4e2d\u6267\u884c\u526f\u4f5c\u7528\uff0c\u5305\u62ec\u5728\u7ec4\u4ef6\u88c5\u8f7d\u548c\u66f4\u65b0\u65f6\u66f4\u65b0 dom\u3002useeffect \u94a9\u5b50\u63a5\u53d7\u4e24\u4e2a\u53c2\u6570\uff1a\u4e00\u4e2a\u56de\u8c03\u51fd\u6570\u548c\u4e00\u4e2a\u4f9d\u8d56\u9879\u6570\u7ec4\u3002 \u4ee5\u4e0b\u662f\u4f7f\u7528 useeffect \u6765\u5ef6\u8fdf\u5bf9 dom \u5143\u7d20\u7684\u67e5\u8be2\u7684\u91cd\u5199\u4ee3\u7801\uff1a useEffect(() => { if (props.scrollToIdx) { const scrollToIdx = props.scrollToIdx; setTimeout(() => { const container = document.querySelector(“#container”); const div: HTMLDivElement | […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-53412","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/53412","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=53412"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/53412\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=53412"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=53412"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=53412"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}