{"id":53401,"date":"2024-12-03T15:40:16","date_gmt":"2024-12-03T07:40:16","guid":{"rendered":"https:\/\/fwq.ai\/blog\/53401\/"},"modified":"2024-12-03T15:40:16","modified_gmt":"2024-12-03T07:40:16","slug":"%e7%88%b6%e7%bb%84%e4%bb%b6%e6%af%8f%e6%ac%a1%e7%82%b9%e5%87%bb%e5%a6%82%e4%bd%95%e7%a1%ae%e4%bf%9d%e5%ad%90%e7%bb%84%e4%bb%b6useeffect%e4%bb%a3%e7%a0%81%e6%89%a7%e8%a1%8c%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/53401\/","title":{"rendered":"\u7236\u7ec4\u4ef6\u6bcf\u6b21\u70b9\u51fb\u5982\u4f55\u786e\u4fdd\u5b50\u7ec4\u4ef6useEffect\u4ee3\u7801\u6267\u884c\uff1f"},"content":{"rendered":"

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

\u7236\u7ec4\u4ef6\u6bcf\u6b21\u70b9\u51fb\u5982\u4f55\u786e\u4fdd\u5b50\u7ec4\u4ef6useEffect\u4ee3\u7801\u6267\u884c\uff1f <\/h1>\n

\u7f16\u7a0b\u5e76\u4e0d\u662f\u4e00\u4e2a\u673a\u68b0\u6027\u7684\u5de5\u4f5c\uff0c\u800c\u662f\u9700\u8981\u6709\u601d\u8003\uff0c\u6709\u521b\u65b0\u7684\u5de5\u4f5c\uff0c\u8bed\u6cd5\u662f\u56fa\u5b9a\u7684\uff0c\u4f46\u89e3\u51b3\u95ee\u9898\u7684\u601d\u8def\u5219\u662f\u4f9d\u9760\u4eba\u7684\u601d\u7ef4\uff0c\u8fd9\u5c31\u9700\u8981\u6211\u4eec\u575a\u6301\u5b66\u4e60\u548c\u66f4\u65b0\u81ea\u5df1\u7684\u77e5\u8bc6\u3002\u4eca\u5929\u7c73\u4e91\u5c31\u6574\u7406\u5206\u4eab\u300a\u7236\u7ec4\u4ef6\u6bcf\u6b21\u70b9\u51fb\u5982\u4f55\u786e\u4fdd\u5b50\u7ec4\u4ef6useEffect\u4ee3\u7801\u6267\u884c\uff1f \u300b\uff0c\u6587\u7ae0\u8bb2\u89e3\u7684\u77e5\u8bc6\u70b9\u4e3b\u8981\u5305\u62ec\uff0c\u5982\u679c\u4f60\u5bf9\u6587\u7ae0\u65b9\u9762\u7684\u77e5\u8bc6\u70b9\u611f\u5174\u8da3\uff0c\u5c31\u4e0d\u8981\u9519\u8fc7\u7c73\u4e91\uff0c\u5728\u8fd9\u53ef\u4ee5\u5bf9\u5927\u5bb6\u7684\u77e5\u8bc6\u79ef\u7d2f\u6709\u6240\u5e2e\u52a9\uff0c\u52a9\u529b\u5f00\u53d1\u80fd\u529b\u7684\u63d0\u5347\u3002<\/p>\n

\"\u7236\u7ec4\u4ef6\u6bcf\u6b21\u70b9\u51fb\u5982\u4f55\u786e\u4fdd\u5b50\u7ec4\u4ef6useEffect\u4ee3\u7801\u6267\u884c\uff1f\u63d2\u56fe\"<\/p>\n

\u5982\u4f55\u5728\u6bcf\u6b21\u7236\u7ec4\u4ef6\u70b9\u51fb\u65f6\u786e\u4fdd useeffect \u4e2d\u7684\u4ee3\u7801\u6267\u884c<\/strong><\/p>\n

\u7236\u7ec4\u4ef6\u4e2d\u58f0\u660e\u4e86 setselidx(20)\uff0c\u7528\u6765\u66f4\u65b0\u5b50\u7ec4\u4ef6\u7684 useeffect \u4e2d\u7684 props.scrolltoidx \u5c5e\u6027\u3002\u7136\u800c\uff0c\u70b9\u51fb setselidx \u540e\uff0cuseeffect \u4e2d\u7684\u4ee3\u7801\u4ec5\u5728 scrolltoidx \u5c5e\u6027\u53d1\u751f\u53d8\u5316\u65f6\u624d\u4f1a\u6267\u884c\u3002<\/p>\n

\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u7684\u65b9\u6848\u662f\uff1a\u4f7f\u7528 ref \u800c\u4e0d\u662f props\u3002ref \u5141\u8bb8\u76f4\u63a5\u8c03\u7528 react \u7ec4\u4ef6\u7684\u65b9\u6cd5\uff0c\u800c\u4e0d\u662f\u901a\u8fc7 props \u54cd\u5e94\u5f0f\u5730\u66f4\u65b0\u3002<\/p>\n

\u5b50\u7ec4\u4ef6 subcontainer.tsx<\/strong>\uff1a<\/p>\n

import react, { useref, forwardref } from \"react\";\n\nexport interface subcontainerref {\n  scrollto(index: number): void;\n}\n\nexport const subcontainer = forwardref<subcontainerref, subcontainerprops>(\n  (props, ref) => {\n    const scrollto = (scrolltoidx: number) => {\n      const container = document.queryselector(\"#container\");\n      const div: htmldivelement | null = document.queryselector(\n        \"#item-\" + scrolltoidx!.tostring()\n      );\n\n      console.log(container, div);\n      if (container) {\n        container.scrollto({\n          top: div!.offsettop,\n          behavior: \"smooth\",\n        });\n      }\n    };\n\n    useimperativehandle(\n      ref,\n      () => ({\n        scrollto,\n      }),\n      []\n    );\n\n    \/\/ ... \u5176\u4f59\u4ee3\u7801\n  }\n);<\/pre>\n
\u7236\u7ec4\u4ef6 app.tsx<\/strong>\uff1a<\/p>\n
import React, { useRef } from \"react\";\n\nconst App = () => {\n  const conRef = useRef<SubContainerRef>();\n\n  const btnClick = () => {\n    conRef.current?.scrollTo(20);\n  };\n\n  return (\n    <div>\n      <SubContainer ref={conRef} {...props} \/>\n      <button onClick={btnClick}>\u70b9\u51fb<\/button>\n    <\/div>\n  );\n};\n\nexport default App;<\/pre>\n
\u73b0\u5728\uff0c\u6bcf\u6b21\u70b9\u51fb app \u4e2d\u7684\u6309\u94ae\u65f6\uff0csubcontainer \u7ec4\u4ef6\u7684\u65b9\u6cd5 scrollto \u90fd\u4f1a\u88ab\u76f4\u63a5\u8c03\u7528\uff0c\u65e0\u8bba props.scrolltoidx \u662f\u5426\u53d1\u751f\u53d8\u5316\u3002\u8fd9\u5c06\u786e\u4fdd subcomponent \u4e2d\u7684 useeffect \u4ee3\u7801\u59cb\u7ec8\u6267\u884c\u3002<\/p>\n
\u6587\u4e2d\u5173\u4e8e\u7684\u77e5\u8bc6\u4ecb\u7ecd\uff0c\u5e0c\u671b\u5bf9\u4f60\u7684\u5b66\u4e60\u6709\u6240\u5e2e\u52a9\uff01\u82e5\u662f\u53d7\u76ca\u532a\u6d45\uff0c\u90a3\u5c31\u52a8\u52a8\u9f20\u6807\u6536\u85cf\u8fd9\u7bc7\u300a\u7236\u7ec4\u4ef6\u6bcf\u6b21\u70b9\u51fb\u5982\u4f55\u786e\u4fdd\u5b50\u7ec4\u4ef6useEffect\u4ee3\u7801\u6267\u884c\uff1f \u300b\u6587\u7ae0\u5427\uff0c\u4e5f\u53ef\u5173\u6ce8\u7c73\u4e91\u516c\u4f17\u53f7\u4e86\u89e3\u76f8\u5173\u6280\u672f\u6587\u7ae0\u3002<\/p>\n
\n
<\/dt>\n
\n   \u5982\u4f55\u5728 Python \u4e2d\u4f18\u96c5\u5730\u5bfc\u5165\u4e0a\u4e00\u7ea7\u6a21\u5757\uff1f\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
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