{"id":52098,"date":"2024-12-03T09:27:47","date_gmt":"2024-12-03T01:27:47","guid":{"rendered":"https:\/\/fwq.ai\/blog\/52098\/"},"modified":"2024-12-03T09:27:47","modified_gmt":"2024-12-03T01:27:47","slug":"react%e4%b8%adusestate%e5%9c%a8%e5%bc%82%e6%ad%a5%e4%bb%a3%e7%a0%81%e4%b8%ad%e4%b8%ba%e4%bd%95%e6%97%a0%e6%b3%95%e6%9b%b4%e6%96%b0%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/52098\/","title":{"rendered":"React\u4e2duseState\u5728\u5f02\u6b65\u4ee3\u7801\u4e2d\u4e3a\u4f55\u65e0\u6cd5\u66f4\u65b0\uff1f"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>React\u4e2duseState\u5728\u5f02\u6b65\u4ee3\u7801\u4e2d\u4e3a\u4f55\u65e0\u6cd5\u66f4\u65b0\uff1f<\/h1>\n<p>\u672c\u7bc7\u6587\u7ae0\u4e3b\u8981\u662f\u7ed3\u5408\u6211\u4e4b\u524d\u9762\u8bd5\u7684\u5404\u79cd\u7ecf\u5386\u548c\u5b9e\u6218\u5f00\u53d1\u4e2d\u9047\u5230\u7684\u95ee\u9898\u89e3\u51b3\u7ecf\u9a8c\u6574\u7406\u7684\uff0c\u5e0c\u671b\u8fd9\u7bc7\u300aReact\u4e2duseState\u5728\u5f02\u6b65\u4ee3\u7801\u4e2d\u4e3a\u4f55\u65e0\u6cd5\u66f4\u65b0\uff1f\u300b\u5bf9\u4f60\u6709\u5f88\u5927\u5e2e\u52a9\uff01\u6b22\u8fce\u6536\u85cf\uff0c\u5206\u4eab\u7ed9\u66f4\u591a\u7684\u9700\u8981\u7684\u670b\u53cb\u5b66\u4e60~<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241119\/1731978751673be5ff7c4c9.jpg\" class=\"aligncenter\" title=\"React\u4e2duseState\u5728\u5f02\u6b65\u4ee3\u7801\u4e2d\u4e3a\u4f55\u65e0\u6cd5\u66f4\u65b0\uff1f\u63d2\u56fe\" alt=\"React\u4e2duseState\u5728\u5f02\u6b65\u4ee3\u7801\u4e2d\u4e3a\u4f55\u65e0\u6cd5\u66f4\u65b0\uff1f\u63d2\u56fe\" \/><\/p>\n<p><strong>react\u4e2dusestate\u5728\u5f02\u6b65\u4ee3\u7801\u4e2d\u4e3a\u4f55\u65e0\u6cd5\u66f4\u65b0\uff1f<\/strong><\/p>\n<p>\u80cc\u666f\uff1a\u4ee5\u4e0breact\u4ee3\u7801\u65e8\u5728\u5355\u51fb\u6309\u94ae\u65f6\u5c06\u8ba1\u6570\u589e\u52a01\uff1a<\/p>\n<pre>import { usestate } from 'react';\n\nexport default function app() {\n  const [count, setcount] = usestate(0);\n  const handleclick = () =&gt; {\n    setcount(count + 1);\n    settimeout(() =&gt; {\n      console.log(count, 'end'); \/\/ \u4e3a\u4f55\u4ecd\u7136\u8f93\u51fa0\uff1f\n    }, 5000);\n  }\n  return (\n    &lt;&gt;\n      &lt;button onclick={handleclick}&gt;+1&lt;\/button&gt;\n      &lt;span&gt;{count}&lt;\/span&gt;\n    &lt;\/&gt;\n  );\n}<\/pre>\n<p>\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u867d\u7136handleclick\u4e2dsetcount\u5f02\u6b65\u66f4\u65b0\u4e86count\uff0c\u4f46settimeout\u4e5f\u662f\u5f02\u6b65\u7684\uff0c\u56e0\u6b64\u4f1a\u8f93\u51fa\u7684\u662fcount\u521d\u59cb\u503c0\uff0c\u800c\u975e\u9884\u671f\u76841\u3002<\/p>\n<p>\u5c1d\u8bd5\uff1a<\/p>\n<p>\u4f7f\u7528\u666e\u901ajs\u51fd\u6570\u8fdb\u884c\u6bd4\u8f83\uff1a<\/p>\n<pre>function outerFunction() {    \n  let count = 0;  \n  \n  function innerFunction() {    \n    console.log(count);  \n  }    \n  \n  count = 1;  \n  setTimeout(innerFunction, 5000); \n  \n  count = 2; \n}    \n  \nouterFunction();<\/pre>\n<p>\u5728\u975ereact\u73af\u5883\u4e0b\uff0cconsole.log\u8f93\u51fa\u7684\u662f\u6700\u65b0\u7684\u503c2\u3002<\/p>\n<p>\u539f\u56e0\uff1a<\/p>\n<p>\u4e24\u6bb5\u4ee3\u7801\u6253\u5370\u7ed3\u679c\u4e0d\u540c\u7684\u539f\u56e0\u5728\u4e8ereact\u4e2dusestate\u7684\u5f02\u6b65\u66f4\u65b0\u7279\u6027\u3002<\/p>\n<p>\u6bcf\u6b21react\u7ec4\u4ef6\u6e32\u67d3\u90fd\u4f1a\u751f\u6210\u4e00\u4e2a&#8221;\u5e73\u884c\u5b87\u5b99&#8221;\u3002\u521d\u59cb\u5316\u6e32\u67d3\u65f6\u751f\u6210\u7684\u5b87\u5b99\u4e2d\uff0ccount\u503c\u4e3a0\u3002\u5373\u4f7fsettimeout\u5ef6\u8fdf\u6267\u884c\uff0c\u5b83\u4e5f\u53ea\u80fd\u8f93\u51fa0\u3002<\/p>\n<p>\u5f53\u8c03\u7528setcount(count + 1)\u65f6\uff0c\u89e6\u53d1\u7b2c\u4e8c\u6b21\u6e32\u67d3\uff0c\u751f\u6210\u4e00\u4e2a\u65b0\u7684\u5e73\u884c\u5b87\u5b99\uff0c\u5176\u4e2dcount\u4e3a1\u3002\u8be5\u5b87\u5b99\u4e2d\u7684settimeout\u53ea\u80fd\u8f93\u51fa1\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u5373\u4f7f\u4f7f\u7528\u5b9a\u65f6\u5668\uff0ccount\u4e5f\u65e0\u6cd5\u7a7f\u900f\u5e73\u884c\u5b87\u5b99\u7684\u9650\u5236\uff0c\u5bfc\u81f4\u5728\u5f02\u6b65\u56de\u8c03\u4e2d\u8f93\u51fa\u521d\u59cb\u503c\u3002<\/p>\n<p>\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\u300aReact\u4e2duseState\u5728\u5f02\u6b65\u4ee3\u7801\u4e2d\u4e3a\u4f55\u65e0\u6cd5\u66f4\u65b0\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<dl>\n<dt><\/dt>\n<dd>\n   \u4e3a\u4ec0\u4e48\u6211\u7684 forEach lambda \u4e0d\u5141\u8bb8\u6211\u4f7f\u7528 Java \u4e2d\u7684 return \u8bed\u53e5\u9000\u51fa\u51fd\u6570\uff1f\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>React\u4e2duseState\u5728\u5f02\u6b65\u4ee3\u7801\u4e2d\u4e3a\u4f55\u65e0\u6cd5\u66f4\u65b0\uff1f \u672c\u7bc7\u6587\u7ae0\u4e3b\u8981\u662f\u7ed3\u5408\u6211\u4e4b\u524d\u9762\u8bd5\u7684\u5404\u79cd\u7ecf\u5386\u548c\u5b9e\u6218\u5f00\u53d1\u4e2d\u9047\u5230\u7684\u95ee\u9898\u89e3\u51b3\u7ecf\u9a8c\u6574\u7406\u7684\uff0c\u5e0c\u671b\u8fd9\u7bc7\u300aReact\u4e2duseState\u5728\u5f02\u6b65\u4ee3\u7801\u4e2d\u4e3a\u4f55\u65e0\u6cd5\u66f4\u65b0\uff1f\u300b\u5bf9\u4f60\u6709\u5f88\u5927\u5e2e\u52a9\uff01\u6b22\u8fce\u6536\u85cf\uff0c\u5206\u4eab\u7ed9\u66f4\u591a\u7684\u9700\u8981\u7684\u670b\u53cb\u5b66\u4e60~ react\u4e2dusestate\u5728\u5f02\u6b65\u4ee3\u7801\u4e2d\u4e3a\u4f55\u65e0\u6cd5\u66f4\u65b0\uff1f \u80cc\u666f\uff1a\u4ee5\u4e0breact\u4ee3\u7801\u65e8\u5728\u5355\u51fb\u6309\u94ae\u65f6\u5c06\u8ba1\u6570\u589e\u52a01\uff1a import { usestate } from &#8216;react&#8217;; export default function app() { const [count, setcount] = usestate(0); const handleclick = () =&gt; { setcount(count + 1); settimeout(() =&gt; { console.log(count, &#8216;end&#8217;); \/\/ \u4e3a\u4f55\u4ecd\u7136\u8f93\u51fa0\uff1f }, 5000); } return ( &lt;&gt; &lt;button onclick={handleclick}&gt;+1&lt;\/button&gt; &lt;span&gt;{count}&lt;\/span&gt; &lt;\/&gt; ); } \u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u867d\u7136handleclick\u4e2dsetcount\u5f02\u6b65\u66f4\u65b0\u4e86count\uff0c\u4f46settimeout\u4e5f\u662f\u5f02\u6b65\u7684\uff0c\u56e0\u6b64\u4f1a\u8f93\u51fa\u7684\u662fcount\u521d\u59cb\u503c0\uff0c\u800c\u975e\u9884\u671f\u76841\u3002 \u5c1d\u8bd5\uff1a \u4f7f\u7528\u666e\u901ajs\u51fd\u6570\u8fdb\u884c\u6bd4\u8f83\uff1a function outerFunction() { let [&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-52098","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/52098","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=52098"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/52098\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=52098"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=52098"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=52098"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}