{"id":52220,"date":"2024-12-03T08:21:47","date_gmt":"2024-12-03T00:21:47","guid":{"rendered":"https:\/\/fwq.ai\/blog\/52220\/"},"modified":"2024-12-03T08:21:47","modified_gmt":"2024-12-03T00:21:47","slug":"react-18-%e7%b1%bb%e7%bb%84%e4%bb%b6%e6%a8%a1%e6%8b%9f%e6%b8%b2%e6%9f%93%e4%b8%ad%ef%bc%8cconstructor-%e5%88%9d%e5%a7%8b%e5%8c%96%e7%9a%84%e5%af%b9%e8%b1%a1%e4%b8%ba%e4%bb%80%e4%b9%88%e4%bc%9a-3","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/52220\/","title":{"rendered":"React 18 \u7c7b\u7ec4\u4ef6\u6a21\u62df\u6e32\u67d3\u4e2d\uff0cconstructor \u521d\u59cb\u5316\u7684\u5bf9\u8c61\u4e3a\u4ec0\u4e48\u4f1a\u88ab\u91cd\u7f6e\uff1f"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>React 18 \u7c7b\u7ec4\u4ef6\u6a21\u62df\u6e32\u67d3\u4e2d\uff0cconstructor \u521d\u59cb\u5316\u7684\u5bf9\u8c61\u4e3a\u4ec0\u4e48\u4f1a\u88ab\u91cd\u7f6e\uff1f <\/h1>\n<p>\u5728\u6587\u7ae0\u5b9e\u6218\u5f00\u53d1\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u4f1a\u9047\u5230\u4e00\u4e9b\u8fd9\u6837\u90a3\u6837\u7684\u95ee\u9898\uff0c\u7136\u540e\u8981\u5361\u597d\u534a\u5929\uff0c\u7b49\u95ee\u9898\u89e3\u51b3\u4e86\u624d\u53d1\u73b0\u539f\u6765\u4e00\u4e9b\u7ec6\u8282\u77e5\u8bc6\u70b9\u8fd8\u662f\u6ca1\u6709\u638c\u63e1\u597d\u3002\u4eca\u5929\u7c73\u4e91\u5c31\u6574\u7406\u5206\u4eab\u300aReact 18 \u7c7b\u7ec4\u4ef6\u6a21\u62df\u6e32\u67d3\u4e2d\uff0cconstructor \u521d\u59cb\u5316\u7684\u5bf9\u8c61\u4e3a\u4ec0\u4e48\u4f1a\u88ab\u91cd\u7f6e\uff1f \u300b\uff0c\u804a\u804a\uff0c\u5e0c\u671b\u53ef\u4ee5\u5e2e\u52a9\u5230\u6b63\u5728\u52aa\u529b\u8d5a\u94b1\u7684\u4f60\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241119\/1732008656673c5ad04deab.jpg\" class=\"aligncenter\" title=\"React 18 \u7c7b\u7ec4\u4ef6\u6a21\u62df\u6e32\u67d3\u4e2d\uff0cconstructor \u521d\u59cb\u5316\u7684\u5bf9\u8c61\u4e3a\u4ec0\u4e48\u4f1a\u88ab\u91cd\u7f6e\uff1f\u63d2\u56fe\" alt=\"React 18 \u7c7b\u7ec4\u4ef6\u6a21\u62df\u6e32\u67d3\u4e2d\uff0cconstructor \u521d\u59cb\u5316\u7684\u5bf9\u8c61\u4e3a\u4ec0\u4e48\u4f1a\u88ab\u91cd\u7f6e\uff1f\u63d2\u56fe\" \/><\/p>\n<p><strong>React 18 \u4e2d\u7c7b\u7ec4\u4ef6\u6a21\u62df\u6e32\u67d3\u884c\u4e3a\u5206\u6790<\/strong><\/p>\n<p>\u5728 React 18 \u7684\u4e25\u683c\u6a21\u5f0f\u4e0b\uff0c\u7c7b\u7ec4\u4ef6\u4f1a\u6267\u884c\u6a21\u62df\u6e32\u67d3\u4ee5\u68c0\u6d4b\u6f5c\u5728\u7684\u6027\u80fd\u95ee\u9898\u3002\u5728\u6b64\u8fc7\u7a0b\u4e2d\uff0c\u7c7b\u7ec4\u4ef6\u7684\u751f\u547d\u5468\u671f\u94a9\u5b50\u8c03\u7528\u987a\u5e8f\u6709\u6240\u53d8\u5316\u3002<\/p>\n<p><strong>\u6a21\u62df\u6e32\u67d3\u987a\u5e8f<\/strong><\/p>\n<ul>\n<li>constructor (\u6a21\u62df)<\/li>\n<li>constructor (\u5b9e\u9645)<\/li>\n<li>componentDidMount (\u6a21\u62df)<\/li>\n<li>componentWillUnmount (\u6a21\u62df)<\/li>\n<li>componentDidMount (\u5b9e\u9645)<\/li>\n<\/ul>\n<p><strong>\u95ee\u9898\u4ea7\u751f\u7684\u539f\u56e0<\/strong><\/p>\n<p>\u95ee\u9898\u7684\u5173\u952e\u5728\u4e8e\uff0c\u7ec4\u4ef6\u5378\u8f7d\u65f6\uff0c\u5728 constructor \u4e2d\u521d\u59cb\u5316\u7684\u5bf9\u8c61\u4e5f\u4f1a\u88ab\u91cd\u7f6e\u3002\u8fd9\u662f\u56e0\u4e3a\u6a21\u62df\u6e32\u67d3\u4e2d\u7684 componentWillUnmount \u4f1a\u8c03\u7528\u5b9e\u9645\u7ec4\u4ef6\u7684\u5378\u8f7d\u94a9\u5b50\uff0c\u4ece\u800c\u5f71\u54cd\u5b9e\u9645\u7ec4\u4ef6\u7684\u72b6\u6001\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u5728\u6784\u9020\u51fd\u6570\u4e2d\u521b\u5efa\u4e00\u4e2a\u5bf9\u8c61\uff1a<\/p>\n<pre>constructor(props) {\n  super(props);\n  this.ob = new A();\n}<\/pre>\n<p>\u5728\u5378\u8f7d\u65f6\uff0c\u8be5\u5bf9\u8c61\u4f1a\u88ab\u91cd\u7f6e\u4e3a null\uff1a<\/p>\n<pre>componentWillUnmount() {\n  this.ob = null;\n}<\/pre>\n<p>\u8fd9\u4f1a\u5bfc\u81f4\u7b2c\u4e8c\u6b21\u6e32\u67d3\u4e2d\uff0c\u5728 constructor \u4e2d\u521d\u59cb\u5316\u7684\u5bf9\u8c61\u5df2\u88ab\u91cd\u7f6e\uff0c\u4ece\u800c\u5bfc\u81f4\u9519\u8bef\u3002<\/p>\n<p><strong>\u89e3\u51b3\u65b9\u6cd5<\/strong><\/p>\n<p>\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u7684\u65b9\u6cd5\u6709\u51e0\u79cd\uff1a<\/p>\n<ul>\n<li>\u5c06\u5bf9\u8c61\u7684\u521d\u59cb\u5316\u8f6c\u79fb\u5230 componentDidMount \u4e2d\u3002<\/li>\n<li>\u4f7f\u7528 React \u7684\u65b0\u751f\u547d\u5468\u671f\u94a9\u5b50 getDerivedStateFromProps \u6216 getSnapshotBeforeUpdate\u3002\u8fd9\u4e9b\u94a9\u5b50\u4f1a\u5728\u6bcf\u6b21\u6e32\u67d3\u524d\u8c03\u7528\uff0c\u56e0\u6b64\u53ef\u4ee5\u5b89\u5168\u5730\u521d\u59cb\u5316\u5bf9\u8c61\u3002<\/li>\n<\/ul>\n<p>\u672c\u7bc7\u5173\u4e8e\u300aReact 18 \u7c7b\u7ec4\u4ef6\u6a21\u62df\u6e32\u67d3\u4e2d\uff0cconstructor \u521d\u59cb\u5316\u7684\u5bf9\u8c61\u4e3a\u4ec0\u4e48\u4f1a\u88ab\u91cd\u7f6e\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<dl>\n<dt><\/dt>\n<dd>\n   \u63ed\u79d8\u7535\u8111\u9a71\u52a8\u539f\u7406\uff1a\u4f60\u5fc5\u987b\u4e86\u89e3\u7684\u7535\u8111\u9a71\u52a8\u662f\u4ec0\u4e48\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>React 18 \u7c7b\u7ec4\u4ef6\u6a21\u62df\u6e32\u67d3\u4e2d\uff0cconstructor \u521d\u59cb\u5316\u7684\u5bf9\u8c61\u4e3a\u4ec0\u4e48\u4f1a\u88ab\u91cd\u7f6e\uff1f \u5728\u6587\u7ae0\u5b9e\u6218\u5f00\u53d1\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u4f1a\u9047\u5230\u4e00\u4e9b\u8fd9\u6837\u90a3\u6837\u7684\u95ee\u9898\uff0c\u7136\u540e\u8981\u5361\u597d\u534a\u5929\uff0c\u7b49\u95ee\u9898\u89e3\u51b3\u4e86\u624d\u53d1\u73b0\u539f\u6765\u4e00\u4e9b\u7ec6\u8282\u77e5\u8bc6\u70b9\u8fd8\u662f\u6ca1\u6709\u638c\u63e1\u597d\u3002\u4eca\u5929\u7c73\u4e91\u5c31\u6574\u7406\u5206\u4eab\u300aReact 18 \u7c7b\u7ec4\u4ef6\u6a21\u62df\u6e32\u67d3\u4e2d\uff0cconstructor \u521d\u59cb\u5316\u7684\u5bf9\u8c61\u4e3a\u4ec0\u4e48\u4f1a\u88ab\u91cd\u7f6e\uff1f \u300b\uff0c\u804a\u804a\uff0c\u5e0c\u671b\u53ef\u4ee5\u5e2e\u52a9\u5230\u6b63\u5728\u52aa\u529b\u8d5a\u94b1\u7684\u4f60\u3002 React 18 \u4e2d\u7c7b\u7ec4\u4ef6\u6a21\u62df\u6e32\u67d3\u884c\u4e3a\u5206\u6790 \u5728 React 18 \u7684\u4e25\u683c\u6a21\u5f0f\u4e0b\uff0c\u7c7b\u7ec4\u4ef6\u4f1a\u6267\u884c\u6a21\u62df\u6e32\u67d3\u4ee5\u68c0\u6d4b\u6f5c\u5728\u7684\u6027\u80fd\u95ee\u9898\u3002\u5728\u6b64\u8fc7\u7a0b\u4e2d\uff0c\u7c7b\u7ec4\u4ef6\u7684\u751f\u547d\u5468\u671f\u94a9\u5b50\u8c03\u7528\u987a\u5e8f\u6709\u6240\u53d8\u5316\u3002 \u6a21\u62df\u6e32\u67d3\u987a\u5e8f constructor (\u6a21\u62df) constructor (\u5b9e\u9645) componentDidMount (\u6a21\u62df) componentWillUnmount (\u6a21\u62df) componentDidMount (\u5b9e\u9645) \u95ee\u9898\u4ea7\u751f\u7684\u539f\u56e0 \u95ee\u9898\u7684\u5173\u952e\u5728\u4e8e\uff0c\u7ec4\u4ef6\u5378\u8f7d\u65f6\uff0c\u5728 constructor \u4e2d\u521d\u59cb\u5316\u7684\u5bf9\u8c61\u4e5f\u4f1a\u88ab\u91cd\u7f6e\u3002\u8fd9\u662f\u56e0\u4e3a\u6a21\u62df\u6e32\u67d3\u4e2d\u7684 componentWillUnmount \u4f1a\u8c03\u7528\u5b9e\u9645\u7ec4\u4ef6\u7684\u5378\u8f7d\u94a9\u5b50\uff0c\u4ece\u800c\u5f71\u54cd\u5b9e\u9645\u7ec4\u4ef6\u7684\u72b6\u6001\u3002 \u4f8b\u5982\uff0c\u5982\u679c\u4f60\u5728\u6784\u9020\u51fd\u6570\u4e2d\u521b\u5efa\u4e00\u4e2a\u5bf9\u8c61\uff1a constructor(props) { super(props); this.ob = new A(); } \u5728\u5378\u8f7d\u65f6\uff0c\u8be5\u5bf9\u8c61\u4f1a\u88ab\u91cd\u7f6e\u4e3a null\uff1a componentWillUnmount() { this.ob = null; } \u8fd9\u4f1a\u5bfc\u81f4\u7b2c\u4e8c\u6b21\u6e32\u67d3\u4e2d\uff0c\u5728 constructor \u4e2d\u521d\u59cb\u5316\u7684\u5bf9\u8c61\u5df2\u88ab\u91cd\u7f6e\uff0c\u4ece\u800c\u5bfc\u81f4\u9519\u8bef\u3002 \u89e3\u51b3\u65b9\u6cd5 \u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u7684\u65b9\u6cd5\u6709\u51e0\u79cd\uff1a [&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-52220","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/52220","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=52220"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/52220\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=52220"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=52220"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=52220"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}