{"id":52918,"date":"2024-12-03T14:29:32","date_gmt":"2024-12-03T06:29:32","guid":{"rendered":"https:\/\/fwq.ai\/blog\/52918\/"},"modified":"2024-12-03T14:29:32","modified_gmt":"2024-12-03T06:29:32","slug":"react%e4%b8%adforwardref%e5%92%8cuseimperativehandle%e5%af%bc%e8%87%b4%e7%b1%bb%e5%9e%8bnever%e4%b8%8a%e4%b8%8d%e5%ad%98%e5%9c%a8%e5%b1%9e%e6%80%a7childfocusfn","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/52918\/","title":{"rendered":"React\u4e2dforwardRef\u548cuseImperativeHandle\u5bfc\u81f4\u201c\u7c7b\u578b\u201cnever\u201d\u4e0a\u4e0d\u5b58\u5728\u5c5e\u6027\u201cchildFocusFn\u201d\u9519\u8bef\u5982\u4f55\u89e3\u51b3\uff1f"},"content":{"rendered":"

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

React\u4e2dforwardRef\u548cuseImperativeHandle\u5bfc\u81f4\u201c\u7c7b\u578b\u201cnever\u201d\u4e0a\u4e0d\u5b58\u5728\u5c5e\u6027\u201cchildFocusFn\u201d\u9519\u8bef\u5982\u4f55\u89e3\u51b3\uff1f<\/h1>\n

\u5927\u5bb6\u597d\uff0c\u6211\u4eec\u53c8\u89c1\u9762\u4e86\u554a~\u672c\u6587\u300aReact\u4e2dforwardRef\u548cuseImperativeHandle\u5bfc\u81f4\u201c\u7c7b\u578b\u201cnever\u201d\u4e0a\u4e0d\u5b58\u5728\u5c5e\u6027\u201cchildFocusFn\u201d\u9519\u8bef\u5982\u4f55\u89e3\u51b3\uff1f\u300b<\/span>\u7684\u5185\u5bb9\u4e2d\u5c06\u4f1a\u6d89\u53ca\u5230<\/span>\u7b49\u7b49\u3002\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60\u6587\u7ae0<\/span>\u76f8\u5173\u77e5\u8bc6\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\uff0c\u4ee5\u540e\u4f1a\u7ed9\u5927\u5bb6\u5e26\u6765\u66f4\u591a\u6587\u7ae0<\/span>\u76f8\u5173\u6587\u7ae0\uff0c\u5e0c\u671b\u6211\u4eec\u80fd\u4e00\u8d77\u8fdb\u6b65\uff01\u4e0b\u9762\u5c31\u5f00\u59cb\u672c\u6587\u7684\u6b63\u5f0f\u5185\u5bb9~<\/p>\n

\"React\u4e2dforwardRef\u548cuseImperativeHandle\u5bfc\u81f4\u201c\u7c7b\u578b\u201cnever\u201d\u4e0a\u4e0d\u5b58\u5728\u5c5e\u6027\u201cchildFocusFn\u201d\u9519\u8bef\u5982\u4f55\u89e3\u51b3\uff1f\u63d2\u56fe\"<\/p>\n

\u5982\u4f55\u907f\u514d\u201c\u7c7b\u578b\u201cnever\u201d\u4e0a\u4e0d\u5b58\u5728\u5c5e\u6027\u201cchildfocusfn\u201d\u3002ts(2339)\u201d\u9519\u8bef<\/strong><\/p>\n

\u5728react\u4e2d\u4f7f\u7528forwardref\u548cuseimperativehandle\u521b\u5efa\u53ef\u5b9a\u5236\u7ec4\u4ef6\u65f6\uff0c\u53ef\u80fd\u4f1a\u9047\u5230 \u201c\u7c7b\u578b\u201cnever\u201d\u4e0a\u4e0d\u5b58\u5728\u5c5e\u6027\u201cchildfocusfn\u201d\u3002ts(2339)\u201d\u9519\u8bef\u3002<\/p>\n

\u539f\u56e0\uff1a<\/strong>
\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0cuseimperativehandle\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff08ref\uff09\u7c7b\u578b\u4e3anever\u3002\u8fd9\u610f\u5473\u7740\u5728 ref.current \u4e0a\u8bbf\u95ee\u5c5e\u6027\u65f6\uff0c\u7f16\u8bd1\u5668\u65e0\u6cd5\u786e\u8ba4\u5176\u7c7b\u578b\u3002<\/p>\n

\u89e3\u51b3\u65b9\u6cd5\uff1a<\/strong><\/p>\n

\u8981\u907f\u514d\u6b64\u9519\u8bef\uff0c\u9700\u660e\u786e\u6307\u5b9a useimperativehandle\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u7c7b\u578b\u3002\u4f8b\u5982\uff0c\u5bf9\u4e8efocus()\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5c06\u7c7b\u578b\u6307\u5b9a\u4e3a() => void\uff1a<\/p>\n

const ref = useref< { childfocusfn: () => void }>(null);<\/pre>\n
\u4fee\u6539\u540e\u7684\u5b8c\u6574\u4ee3\u7801\u793a\u4f8b\uff1a<\/p>\n
import { forwardRef, useState, LegacyRef, useRef, Ref, createRef, useImperativeHandle } from 'react'\nimport '.\/App.css'\n\n\/\/ \u5b50\u7ec4\u4ef6\n\nconst ChildComp = forwardRef((props, ref) => {\n\n    const childRef = createRef<HTMLInputElement>() \n\n    useImperativeHandle(ref, () => ({\n      childFocusFn: () => {\n        childRef.current?.focus()\n        console.log(\"childFocusFn called.\")\n      }\n    }))\n\n    return <>\n      <input defaultValue=\"\u6211\u662f\u5b50\u7ec4\u4ef6\" type='text' ref={childRef}\/>\n    <\/>\n  }\n)\n\nfunction App() {\n  const ref = useRef< { childFocusFn: () => void }>(null);\n\n  const clickFn = () => {\n    if(ref.current) {\n      ref.current.childFocusFn() \n    }\n  }\n\n  return (\n    <>\n     <ChildComp ref={ref}\/>\n\n     <button onClick={clickFn}>\u70b9\u51fb\u8c03\u7528\u5b50\u7ec4\u4ef6\u65b9\u6cd5<\/button>\n    <\/>\n  )\n}\n\nexport default App<\/pre>\n
\u672c\u7bc7\u5173\u4e8e\u300aReact\u4e2dforwardRef\u548cuseImperativeHandle\u5bfc\u81f4\u201c\u7c7b\u578b\u201cnever\u201d\u4e0a\u4e0d\u5b58\u5728\u5c5e\u6027\u201cchildFocusFn\u201d\u9519\u8bef\u5982\u4f55\u89e3\u51b3\uff1f\u300b\u7684\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\u5566\uff0c\u4f46\u662f\u5b66\u65e0\u6b62\u5883\uff0c\u60f3\u8981\u4e86\u89e3\u5b66\u4e60\u66f4\u591a\u5173\u4e8e\u6587\u7ae0\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u8bf7\u5173\u6ce8\u7c73\u4e91\u516c\u4f17\u53f7\uff01<\/p>\n
\n
<\/dt>\n
\n   \u4ee3\u7406\u83b7\u53d6 URL \u8d44\u6e90\u4e3a\u4f55\u65e0\u6cd5\u81ea\u52a8\u6dfb\u52a0 localhost \u524d\u7f00\uff1f\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
React\u4e2dforwardRef\u548cuseImperativeHandle\u5bfc\u81f4\u201c\u7c7b\u578b\u201cnever\u201d\u4e0a\u4e0d\u5b58\u5728\u5c5e\u6027\u201cchildFocusFn\u201d\u9519\u8bef\u5982\u4f55\u89e3\u51b3\uff1f \u5927\u5bb6\u597d\uff0c\u6211\u4eec\u53c8\u89c1\u9762\u4e86\u554a~\u672c\u6587\u300aReact\u4e2dforwardRef\u548cuseImperativeHandle\u5bfc\u81f4\u201c\u7c7b\u578b\u201cnever\u201d\u4e0a\u4e0d\u5b58\u5728\u5c5e\u6027\u201cchildFocusFn\u201d\u9519\u8bef\u5982\u4f55\u89e3\u51b3\uff1f\u300b\u7684\u5185\u5bb9\u4e2d\u5c06\u4f1a\u6d89\u53ca\u5230\u7b49\u7b49\u3002\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60\u6587\u7ae0\u76f8\u5173\u77e5\u8bc6\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\uff0c\u4ee5\u540e\u4f1a\u7ed9\u5927\u5bb6\u5e26\u6765\u66f4\u591a\u6587\u7ae0\u76f8\u5173\u6587\u7ae0\uff0c\u5e0c\u671b\u6211\u4eec\u80fd\u4e00\u8d77\u8fdb\u6b65\uff01\u4e0b\u9762\u5c31\u5f00\u59cb\u672c\u6587\u7684\u6b63\u5f0f\u5185\u5bb9~ \u5982\u4f55\u907f\u514d\u201c\u7c7b\u578b\u201cnever\u201d\u4e0a\u4e0d\u5b58\u5728\u5c5e\u6027\u201cchildfocusfn\u201d\u3002ts(2339)\u201d\u9519\u8bef \u5728react\u4e2d\u4f7f\u7528forwardref\u548cuseimperativehandle\u521b\u5efa\u53ef\u5b9a\u5236\u7ec4\u4ef6\u65f6\uff0c\u53ef\u80fd\u4f1a\u9047\u5230 \u201c\u7c7b\u578b\u201cnever\u201d\u4e0a\u4e0d\u5b58\u5728\u5c5e\u6027\u201cchildfocusfn\u201d\u3002ts(2339)\u201d\u9519\u8bef\u3002 \u539f\u56e0\uff1a\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0cuseimperativehandle\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff08ref\uff09\u7c7b\u578b\u4e3anever\u3002\u8fd9\u610f\u5473\u7740\u5728 ref.current \u4e0a\u8bbf\u95ee\u5c5e\u6027\u65f6\uff0c\u7f16\u8bd1\u5668\u65e0\u6cd5\u786e\u8ba4\u5176\u7c7b\u578b\u3002 \u89e3\u51b3\u65b9\u6cd5\uff1a \u8981\u907f\u514d\u6b64\u9519\u8bef\uff0c\u9700\u660e\u786e\u6307\u5b9a useimperativehandle\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u7c7b\u578b\u3002\u4f8b\u5982\uff0c\u5bf9\u4e8efocus()\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5c06\u7c7b\u578b\u6307\u5b9a\u4e3a() => void\uff1a const ref = useref< { childfocusfn: () => void }>(null); \u4fee\u6539\u540e\u7684\u5b8c\u6574\u4ee3\u7801\u793a\u4f8b\uff1a import { forwardRef, useState, LegacyRef, useRef, Ref, createRef, useImperativeHandle } from ‘react’ import ‘.\/App.css’ \/\/ \u5b50\u7ec4\u4ef6 const ChildComp = forwardRef((props, ref) => { const childRef = createRef<HTMLInputElement>() useImperativeHandle(ref, () => ({ […]<\/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-52918","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/52918","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=52918"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/52918\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=52918"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=52918"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=52918"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}