{"id":52456,"date":"2024-12-03T16:49:09","date_gmt":"2024-12-03T08:49:09","guid":{"rendered":"https:\/\/fwq.ai\/blog\/52456\/"},"modified":"2024-12-03T16:49:09","modified_gmt":"2024-12-03T08:49:09","slug":"react%e4%b8%ad%e5%a6%82%e4%bd%95%e4%bf%9d%e8%af%81useeffect%e5%9c%a8%e5%ad%90%e7%bb%84%e4%bb%b6%e4%b8%ad%e6%af%8f%e6%ac%a1%e9%83%bd%e6%89%a7%e8%a1%8c%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/52456\/","title":{"rendered":"React\u4e2d\u5982\u4f55\u4fdd\u8bc1useEffect\u5728\u5b50\u7ec4\u4ef6\u4e2d\u6bcf\u6b21\u90fd\u6267\u884c\uff1f"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>React\u4e2d\u5982\u4f55\u4fdd\u8bc1useEffect\u5728\u5b50\u7ec4\u4ef6\u4e2d\u6bcf\u6b21\u90fd\u6267\u884c\uff1f <\/h1>\n<p>\u672c\u7bc7\u6587\u7ae0\u7ed9\u5927\u5bb6\u5206\u4eab\u300aReact\u4e2d\u5982\u4f55\u4fdd\u8bc1useEffect\u5728\u5b50\u7ec4\u4ef6\u4e2d\u6bcf\u6b21\u90fd\u6267\u884c\uff1f \u300b\uff0c\u8986\u76d6\u4e86\u6587\u7ae0\u7684\u5e38\u89c1\u57fa\u7840\u77e5\u8bc6\uff0c\u5176\u5b9e\u4e00\u4e2a\u8bed\u8a00\u7684\u5168\u90e8\u77e5\u8bc6\u70b9\u4e00\u7bc7\u6587\u7ae0\u662f\u4e0d\u53ef\u80fd\u8bf4\u5b8c\u7684\uff0c\u4f46\u5e0c\u671b\u901a\u8fc7\u8fd9\u4e9b\u95ee\u9898\uff0c\u8ba9\u8bfb\u8005\u5bf9\u81ea\u5df1\u7684\u638c\u63e1\u7a0b\u5ea6\u6709\u4e00\u5b9a\u7684\u8ba4\u8bc6(B \u6570)\uff0c\u4ece\u800c\u5f25\u8865\u81ea\u5df1\u7684\u4e0d\u8db3\uff0c\u66f4\u597d\u7684\u638c\u63e1\u5b83\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241120\/1732106387673dd8931a81a.jpg\" class=\"aligncenter\" title=\"React\u4e2d\u5982\u4f55\u4fdd\u8bc1useEffect\u5728\u5b50\u7ec4\u4ef6\u4e2d\u6bcf\u6b21\u90fd\u6267\u884c\uff1f\u63d2\u56fe\" alt=\"React\u4e2d\u5982\u4f55\u4fdd\u8bc1useEffect\u5728\u5b50\u7ec4\u4ef6\u4e2d\u6bcf\u6b21\u90fd\u6267\u884c\uff1f\u63d2\u56fe\" \/><\/p>\n<p><strong>useeffect(&#8230;, [props.scrolltoidx])) \u5982\u4f55\u5b9e\u73b0\u6bcf\u6b21\u90fd\u6267\u884c\uff1f<\/strong><\/p>\n<p>\u4e3a\u4e86\u5728\u5b50\u7ec4\u4ef6\u4e2d\u4fdd\u8bc1 useeffect \u6bcf\u6b21\u90fd\u6267\u884c\uff0c\u53ef\u4ee5\u91c7\u7528\u547d\u4ee4\u5f0f\u8c03\u7528\uff0c\u800c\u975e\u54cd\u5e94\u5f0f\u66f4\u65b0\u3002\u4ee5\u4e0b\u662f\u5982\u4f55\u5b9e\u73b0\u7684\u65b9\u6cd5\uff1a<\/p>\n<p>\u5728\u5b50\u7ec4\u4ef6\u4e2d\u4f7f\u7528 useimperativehandle\uff0c\u5b9a\u4e49\u4e00\u4e2a scrollto \u51fd\u6570\uff0c\u5e76\u5728 ref \u4e2d\u66b4\u9732\u8be5\u51fd\u6570\uff1a<\/p>\n<pre>import { useimperativehandle, forwardref } from 'react';\n\nconst subcontainer = forwardref((props, ref) =&gt; {\n  const scrollto = (scrolltoidx) =&gt; {\n    \/\/ \u6eda\u52a8\u4ee3\u7801\n  };\n\n  useimperativehandle(\n    ref,\n    () =&gt; ({\n      scrollto,\n    }),\n    []\n  );\n\n  \/\/ \u5176\u5b83\u4ee3\u7801\n});<\/pre>\n<p>\u5728\u7236\u7ec4\u4ef6\u4e2d\uff0c\u521b\u5efa\u5bf9\u5b50\u7ec4\u4ef6 ref \u7684\u5f15\u7528\uff0c\u5e76\u4f7f\u7528 ref \u8c03\u7528 scrollto \u51fd\u6570\uff1a<\/p>\n<pre>const conRef = useRef();\n\nconst btnClick = () =&gt; {\n  conRef.current.scrollTo(20);\n};<\/pre>\n<p>\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u4f60\u53ef\u4ee5\u547d\u4ee4\u5f0f\u5730\u8c03\u7528 scrollto \u51fd\u6570\uff0c\u786e\u4fdd\u6bcf\u6b21\u7236\u7ec4\u4ef6\u8c03\u7528 btnclick \u51fd\u6570\u65f6\uff0c\u5b50\u7ec4\u4ef6\u4e2d\u90fd\u4f1a\u6267\u884c useeffect \u56de\u8c03\u3002<\/p>\n<p>\u603b\u7684\u6765\u8bf4\uff0c\u54cd\u5e94\u5f0f\u66f4\u65b0\u4f7f\u7528 props\uff0c\u800c\u547d\u4ee4\u5f0f\u8c03\u7528\u4f7f\u7528 ref\u3002<\/p>\n<p>\u4eca\u5929\u5173\u4e8e\u300aReact\u4e2d\u5982\u4f55\u4fdd\u8bc1useEffect\u5728\u5b50\u7ec4\u4ef6\u4e2d\u6bcf\u6b21\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<dl>\n<dt><\/dt>\n<dd>\n   \u673a\u6784\uff1a\u4e09\u5b63\u5ea6\u4e09\u661f\u91cd\u593a\u5168\u7403\u6298\u53e0\u5c4f\u5e02\u573a\u7b2c\u4e00\uff0c\u8054\u60f3\u4f4d\u5217\u5176\u540e\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>React\u4e2d\u5982\u4f55\u4fdd\u8bc1useEffect\u5728\u5b50\u7ec4\u4ef6\u4e2d\u6bcf\u6b21\u90fd\u6267\u884c\uff1f \u672c\u7bc7\u6587\u7ae0\u7ed9\u5927\u5bb6\u5206\u4eab\u300aReact\u4e2d\u5982\u4f55\u4fdd\u8bc1useEffect\u5728\u5b50\u7ec4\u4ef6\u4e2d\u6bcf\u6b21\u90fd\u6267\u884c\uff1f \u300b\uff0c\u8986\u76d6\u4e86\u6587\u7ae0\u7684\u5e38\u89c1\u57fa\u7840\u77e5\u8bc6\uff0c\u5176\u5b9e\u4e00\u4e2a\u8bed\u8a00\u7684\u5168\u90e8\u77e5\u8bc6\u70b9\u4e00\u7bc7\u6587\u7ae0\u662f\u4e0d\u53ef\u80fd\u8bf4\u5b8c\u7684\uff0c\u4f46\u5e0c\u671b\u901a\u8fc7\u8fd9\u4e9b\u95ee\u9898\uff0c\u8ba9\u8bfb\u8005\u5bf9\u81ea\u5df1\u7684\u638c\u63e1\u7a0b\u5ea6\u6709\u4e00\u5b9a\u7684\u8ba4\u8bc6(B \u6570)\uff0c\u4ece\u800c\u5f25\u8865\u81ea\u5df1\u7684\u4e0d\u8db3\uff0c\u66f4\u597d\u7684\u638c\u63e1\u5b83\u3002 useeffect(&#8230;, [props.scrolltoidx])) \u5982\u4f55\u5b9e\u73b0\u6bcf\u6b21\u90fd\u6267\u884c\uff1f \u4e3a\u4e86\u5728\u5b50\u7ec4\u4ef6\u4e2d\u4fdd\u8bc1 useeffect \u6bcf\u6b21\u90fd\u6267\u884c\uff0c\u53ef\u4ee5\u91c7\u7528\u547d\u4ee4\u5f0f\u8c03\u7528\uff0c\u800c\u975e\u54cd\u5e94\u5f0f\u66f4\u65b0\u3002\u4ee5\u4e0b\u662f\u5982\u4f55\u5b9e\u73b0\u7684\u65b9\u6cd5\uff1a \u5728\u5b50\u7ec4\u4ef6\u4e2d\u4f7f\u7528 useimperativehandle\uff0c\u5b9a\u4e49\u4e00\u4e2a scrollto \u51fd\u6570\uff0c\u5e76\u5728 ref \u4e2d\u66b4\u9732\u8be5\u51fd\u6570\uff1a import { useimperativehandle, forwardref } from &#8216;react&#8217;; const subcontainer = forwardref((props, ref) =&gt; { const scrollto = (scrolltoidx) =&gt; { \/\/ \u6eda\u52a8\u4ee3\u7801 }; useimperativehandle( ref, () =&gt; ({ scrollto, }), [] ); \/\/ \u5176\u5b83\u4ee3\u7801 }); \u5728\u7236\u7ec4\u4ef6\u4e2d\uff0c\u521b\u5efa\u5bf9\u5b50\u7ec4\u4ef6 ref \u7684\u5f15\u7528\uff0c\u5e76\u4f7f\u7528 ref [&hellip;]<\/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-52456","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/52456","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=52456"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/52456\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=52456"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=52456"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=52456"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}