{"id":38523,"date":"2023-09-11T00:42:00","date_gmt":"2022-08-31T09:11:27","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8ereact%e7%9a%84usememo\/"},"modified":"2024-01-15T09:56:45","modified_gmt":"2024-01-15T01:56:45","slug":"%e5%85%b3%e4%ba%8ereact%e7%9a%84usememo","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8ereact%e7%9a%84usememo\/","title":{"rendered":"\u5173\u4e8eReact\u7684useMemo"},"content":{"rendered":"<p>\u6211\u4f1a\u603b\u7ed3React\u7684useMemo\u3002<\/p>\n<p>\u53c2\u8003\u6587\u7ae0\uff1ahttps:\/\/qiita.com\/seira\/items\/42576765aecc9fa6b2f8<\/p>\n<p>\uff08\u53c2\u8003\u8d44\u6599\uff1ahttps:\/\/qiita.com\/seira\/items\/42576765aecc9fa6b2f8\uff09<\/p>\n<p>useMemo\u662f\u4e00\u4e2a\u7528\u4e8e\u4fdd\u5b58\u51fd\u6570\u7ed3\u679c\u7684Hook\uff0c\u5b83\u4f1a\u5bf9\u5177\u6709\u76f8\u540c\u8f93\u51fa\u7ed3\u679c\u7684\u503c\u8fdb\u884c\u8bb0\u5fc6\u5316\uff0c\u5e76\u4ece\u4e2d\u83b7\u53d6\u7ed3\u679c\uff0c\u65e0\u8bba\u8c03\u7528\u591a\u5c11\u6b21\u3002<br \/>\n\u7531\u4e8e\u53ef\u4ee5\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u91cd\u65b0\u8ba1\u7b97\uff0c\u56e0\u6b64\u53ef\u4ee5\u51cf\u5c11\u6e32\u67d3\u6b21\u6570\u3002<br \/>\n\u4e0euseCallback\u7684\u533a\u522b\u5728\u4e8e\uff0cuseMemo\u4f1a\u8bb0\u5fc6\u51fd\u6570\u672c\u8eab\uff0c\u800cuseMemo\u53ea\u662f\u4fdd\u5b58\u51fd\u6570\u7ed3\u679c\u3002<\/p>\n<p>\u6211\u4e5f\u5728\u6211\u7684\u6295\u8d44\u7ec4\u5408\u4e2d\u4ee5\u7c7b\u4f3c\u7684\u65b9\u5f0f\u4f7f\u7528\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">export<\/span> <span class=\"kd\">const<\/span> <span class=\"nx\">Loginbutton<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nf\">memo<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">loginContext<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">useContext<\/span><span class=\"o\">&lt;<\/span><span class=\"nx\">Context<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">(<\/span><span class=\"nx\">LoginContext<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"o\">&lt;<\/span><span class=\"nx\">div<\/span><span class=\"o\">&gt;<\/span>\r\n      <span class=\"o\">&lt;<\/span><span class=\"nx\">Button<\/span> <span class=\"nx\">variant<\/span><span class=\"o\">=<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">outlined<\/span><span class=\"dl\">\"<\/span> <span class=\"nx\">className<\/span><span class=\"o\">=<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">m-auto w-50 my-2<\/span><span class=\"dl\">\"<\/span><span class=\"o\">&gt;<\/span>\r\n        <span class=\"o\">&lt;<\/span><span class=\"nx\">Link<\/span> <span class=\"nx\">href<\/span><span class=\"o\">=<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">\/login<\/span><span class=\"dl\">\"<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">{<\/span><span class=\"nx\">loginContext<\/span><span class=\"p\">.<\/span><span class=\"nx\">text<\/span><span class=\"p\">}<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/Link<\/span><span class=\"err\">&gt;\r\n<\/span>      <span class=\"o\">&lt;<\/span><span class=\"sr\">\/Button<\/span><span class=\"err\">&gt;\r\n<\/span>    <span class=\"o\">&lt;<\/span><span class=\"sr\">\/div<\/span><span class=\"err\">&gt;\r\n<\/span>  <span class=\"p\">);<\/span>\r\n<span class=\"p\">});<\/span>\r\n\r\n<\/code><\/pre>\n<p>\u57fa\u672c\u4e0a\uff0c\u9019\u901a\u5e38\u7528\u65bc\u7d44\u4ef6\u3002\u9019\u6a23\u4e00\u4f86\u53ef\u4ee5\u6e1b\u5c11\u6e32\u67d3\u6b21\u6578\uff0c\u56e0\u6b64\u63a8\u85a6\u4f7f\u7528\u3002<\/p>\n<p>\u8bf7\u5c1d\u8bd5\u5c06\u5176\u5f15\u5165\u5230\u7ec4\u4ef6\u4e2d\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6211\u4f1a\u603b\u7ed3React\u7684useMemo\u3002 \u53c2\u8003\u6587\u7ae0\uff1ahttps:\/\/qiita.com\/seira\/items\/4 [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-38523","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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