{"id":52169,"date":"2024-12-03T16:11:07","date_gmt":"2024-12-03T08:11:07","guid":{"rendered":"https:\/\/fwq.ai\/blog\/52169\/"},"modified":"2024-12-03T16:11:07","modified_gmt":"2024-12-03T08:11:07","slug":"react%e4%b8%ad%e5%a6%82%e4%bd%95%e8%ae%a9useeffect%e5%9c%a8%e6%af%8f%e6%ac%a1%e6%b8%b2%e6%9f%93%e6%97%b6%e9%83%bd%e6%89%a7%e8%a1%8c%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/52169\/","title":{"rendered":"React\u4e2d\u5982\u4f55\u8ba9useEffect\u5728\u6bcf\u6b21\u6e32\u67d3\u65f6\u90fd\u6267\u884c\uff1f"},"content":{"rendered":"

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

React\u4e2d\u5982\u4f55\u8ba9useEffect\u5728\u6bcf\u6b21\u6e32\u67d3\u65f6\u90fd\u6267\u884c\uff1f<\/h1>\n

\u4eb2\u7231\u7684\u7f16\u7a0b\u5b66\u4e60\u7231\u597d\u8005\uff0c\u5982\u679c\u4f60\u70b9\u5f00\u4e86\u8fd9\u7bc7\u6587\u7ae0\uff0c\u8bf4\u660e\u4f60\u5bf9\u300aReact\u4e2d\u5982\u4f55\u8ba9useEffect\u5728\u6bcf\u6b21\u6e32\u67d3\u65f6\u90fd\u6267\u884c\uff1f\u300b\u5f88\u611f\u5174\u8da3\u3002\u672c\u7bc7\u6587\u7ae0\u5c31\u6765\u7ed9\u5927\u5bb6\u8be6\u7ec6\u89e3\u6790\u4e00\u4e0b\uff0c\u4e3b\u8981\u4ecb\u7ecd\u4e00\u4e0b\uff0c\u5e0c\u671b\u6240\u6709\u8ba4\u771f\u8bfb\u5b8c\u7684\u7ae5\u978b\u4eec\uff0c\u90fd\u6709\u5b9e\u8d28\u6027\u7684\u63d0\u9ad8\u3002<\/p>\n

\"React\u4e2d\u5982\u4f55\u8ba9useEffect\u5728\u6bcf\u6b21\u6e32\u67d3\u65f6\u90fd\u6267\u884c\uff1f\u63d2\u56fe\"<\/p>\n

useeffect([props.scrolltoidx]) \u8ba9\u6bcf\u6b21\u90fd\u6267\u884c\u7684\u529e\u6cd5<\/strong><\/p>\n

\u5728react\u7ec4\u4ef6\u4e2d\u4f7f\u7528useeffect\u65f6\uff0c\u901a\u5e38\u4f9d\u8d56\u9879\u6570\u7ec4\uff08\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff09\u7528\u4e8e\u51b3\u5b9a\u4f55\u65f6\u91cd\u65b0\u6267\u884cuseeffect\u3002\u5f53\u4f9d\u8d56\u9879\u6570\u7ec4\u4e2d\u7684\u4efb\u4f55\u503c\u53d1\u751f\u53d8\u5316\u65f6\uff0cuseeffect\u4f1a\u91cd\u65b0\u6267\u884c\u3002<\/p>\n

\u95ee\u9898\u63cf\u8ff0\uff1a<\/strong><\/p>\n

\u5728\u5b50\u7ec4\u4ef6\u4e2d\u4f7f\u7528useeffect\u6765\u76d1\u542cprops.scrolltoidx\u7684\u53d8\u5316\u3002\u5982\u679cprops.scrolltoidx\u66f4\u65b0\uff0cuseeffect\u5c31\u4f1a\u6267\u884c\u5e76\u6eda\u52a8\u5230\u76f8\u5e94\u4f4d\u7f6e\u3002\u4f46\u662f\uff0c\u5982\u679cprops.scrolltoidx\u6ca1\u6709\u66f4\u65b0\uff0cuseeffect\u5c31\u4e0d\u4f1a\u6267\u884c\u3002<\/p>\n

\u89e3\u51b3\u529e\u6cd5\uff1a<\/strong><\/p>\n

\u4e3a\u4e86\u8ba9useeffect\u6bcf\u6b21\u90fd\u6267\u884c\uff0c\u4e00\u79cd\u65b9\u6cd5\u662f\u4f7f\u7528\u547d\u4ee4\u5f0f\u8c03\u7528\u800c\u4e0d\u662f\u54cd\u5e94\u5f0f\u66f4\u65b0\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528react\u7684ref\u6765\u521b\u5efa\u5b50\u7ec4\u4ef6\u7684\u5f15\u7528\uff0c\u5e76\u901a\u8fc7\u7236\u7ec4\u4ef6\u8c03\u7528\u5b50\u7ec4\u4ef6\u7684\u65b9\u6cd5\u3002<\/p>\n

\u5177\u4f53\u5b9e\u73b0\uff1a<\/strong><\/p>\n

\u5728\u5b50\u7ec4\u4ef6\u4e2d\uff1a<\/p>\n

import { forwardref, useimperativehandle, useref } from 'react';\n\nconst subcontainer = forwardref((props, ref) => {\n  const scrollto = (scrolltoidx) => {\n    const container = document.queryselector('#container');\n    const div = document.queryselector('#item-' + scrolltoidx.tostring());\n\n    container.scrollto({\n      top: div.offsettop,\n      behavior: 'smooth',\n    });\n  };\n\n  useimperativehandle(ref, () => ({\n    scrollto,\n  }), []);\n\n  return \/* ... component code *\/\n});<\/pre>\n
\u5728\u7236\u7ec4\u4ef6\u4e2d\uff1a<\/p>\n
import { useRef } from 'react';\n\nconst ParentComponent = () => {\n  const conRef = useRef();\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};<\/pre>\n
\u901a\u8fc7\u4f7f\u7528ref\uff0c\u7236\u7ec4\u4ef6\u53ef\u4ee5\u8bbf\u95ee\u5b50\u7ec4\u4ef6\u7684scrollto\u65b9\u6cd5\uff0c\u5e76\u5c06\u5176\u4f5c\u4e3a\u547d\u4ee4\u8fdb\u884c\u8c03\u7528\u3002\u8fd9\u4f7f\u5f97useeffect\u53ef\u4ee5\u7ed5\u8fc7\u4f9d\u8d56\u9879\u6570\u7ec4\u800c\u6bcf\u6b21\u90fd\u6267\u884c\u3002<\/p>\n
\u4eca\u5929\u5173\u4e8e\u300aReact\u4e2d\u5982\u4f55\u8ba9useEffect\u5728\u6bcf\u6b21\u6e32\u67d3\u65f6\u90fd\u6267\u884c\uff1f\u300b\u7684\u5185\u5bb9\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\uff0c\u5982\u679c\u6709\u4ec0\u4e48\u7591\u95ee\u6216\u8005\u5efa\u8bae\uff0c\u53ef\u4ee5\u5728\u7c73\u4e91\u516c\u4f17\u53f7\u4e0b\u591a\u591a\u56de\u590d\u4ea4\u6d41\uff1b\u6587\u4e2d\u82e5\u6709\u4e0d\u6b63\u4e4b\u5904\uff0c\u4e5f\u5e0c\u671b\u56de\u590d\u7559\u8a00\u4ee5\u544a\u77e5\uff01<\/p>\n
\n
<\/dt>\n
\n   win11\u600e\u4e48\u5173\u95ed\u6444\u50cf\u5934\u529f\u80fd win11\u6444\u50cf\u5934\u8bbf\u95ee\u5173\u95ed\u65b9\u6cd5\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
React\u4e2d\u5982\u4f55\u8ba9useEffect\u5728\u6bcf\u6b21\u6e32\u67d3\u65f6\u90fd\u6267\u884c\uff1f \u4eb2\u7231\u7684\u7f16\u7a0b\u5b66\u4e60\u7231\u597d\u8005\uff0c\u5982\u679c\u4f60\u70b9\u5f00\u4e86\u8fd9\u7bc7\u6587\u7ae0\uff0c\u8bf4\u660e\u4f60\u5bf9\u300aReact\u4e2d\u5982\u4f55\u8ba9useEffect\u5728\u6bcf\u6b21\u6e32\u67d3\u65f6\u90fd\u6267\u884c\uff1f\u300b\u5f88\u611f\u5174\u8da3\u3002\u672c\u7bc7\u6587\u7ae0\u5c31\u6765\u7ed9\u5927\u5bb6\u8be6\u7ec6\u89e3\u6790\u4e00\u4e0b\uff0c\u4e3b\u8981\u4ecb\u7ecd\u4e00\u4e0b\uff0c\u5e0c\u671b\u6240\u6709\u8ba4\u771f\u8bfb\u5b8c\u7684\u7ae5\u978b\u4eec\uff0c\u90fd\u6709\u5b9e\u8d28\u6027\u7684\u63d0\u9ad8\u3002 useeffect([props.scrolltoidx]) \u8ba9\u6bcf\u6b21\u90fd\u6267\u884c\u7684\u529e\u6cd5 \u5728react\u7ec4\u4ef6\u4e2d\u4f7f\u7528useeffect\u65f6\uff0c\u901a\u5e38\u4f9d\u8d56\u9879\u6570\u7ec4\uff08\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff09\u7528\u4e8e\u51b3\u5b9a\u4f55\u65f6\u91cd\u65b0\u6267\u884cuseeffect\u3002\u5f53\u4f9d\u8d56\u9879\u6570\u7ec4\u4e2d\u7684\u4efb\u4f55\u503c\u53d1\u751f\u53d8\u5316\u65f6\uff0cuseeffect\u4f1a\u91cd\u65b0\u6267\u884c\u3002 \u95ee\u9898\u63cf\u8ff0\uff1a \u5728\u5b50\u7ec4\u4ef6\u4e2d\u4f7f\u7528useeffect\u6765\u76d1\u542cprops.scrolltoidx\u7684\u53d8\u5316\u3002\u5982\u679cprops.scrolltoidx\u66f4\u65b0\uff0cuseeffect\u5c31\u4f1a\u6267\u884c\u5e76\u6eda\u52a8\u5230\u76f8\u5e94\u4f4d\u7f6e\u3002\u4f46\u662f\uff0c\u5982\u679cprops.scrolltoidx\u6ca1\u6709\u66f4\u65b0\uff0cuseeffect\u5c31\u4e0d\u4f1a\u6267\u884c\u3002 \u89e3\u51b3\u529e\u6cd5\uff1a \u4e3a\u4e86\u8ba9useeffect\u6bcf\u6b21\u90fd\u6267\u884c\uff0c\u4e00\u79cd\u65b9\u6cd5\u662f\u4f7f\u7528\u547d\u4ee4\u5f0f\u8c03\u7528\u800c\u4e0d\u662f\u54cd\u5e94\u5f0f\u66f4\u65b0\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528react\u7684ref\u6765\u521b\u5efa\u5b50\u7ec4\u4ef6\u7684\u5f15\u7528\uff0c\u5e76\u901a\u8fc7\u7236\u7ec4\u4ef6\u8c03\u7528\u5b50\u7ec4\u4ef6\u7684\u65b9\u6cd5\u3002 \u5177\u4f53\u5b9e\u73b0\uff1a \u5728\u5b50\u7ec4\u4ef6\u4e2d\uff1a import { forwardref, useimperativehandle, useref } from ‘react’; const subcontainer = forwardref((props, ref) => { const scrollto = (scrolltoidx) => { const container = document.queryselector(‘#container’); const div = document.queryselector(‘#item-‘ + scrolltoidx.tostring()); container.scrollto({ top: div.offsettop, behavior: ‘smooth’, }); }; useimperativehandle(ref, () => ({ scrollto, }), […]<\/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-52169","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/52169","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=52169"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/52169\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=52169"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=52169"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=52169"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}