{"id":38099,"date":"2023-12-30T00:49:05","date_gmt":"2022-12-09T14:09:03","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90react%e3%80%91%e8%af%95%e7%94%a8%e4%ba%86usecallback%e5%92%8cusememo%e5%8f%aa%e9%9c%80%e8%a6%81%e4%b8%80%e4%b8%aa%e9%80%89%e9%a1%b9\/"},"modified":"2024-05-04T15:56:45","modified_gmt":"2024-05-04T07:56:45","slug":"%e3%80%90react%e3%80%91%e8%af%95%e7%94%a8%e4%ba%86usecallback%e5%92%8cusememo%e5%8f%aa%e9%9c%80%e8%a6%81%e4%b8%80%e4%b8%aa%e9%80%89%e9%a1%b9","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90react%e3%80%91%e8%af%95%e7%94%a8%e4%ba%86usecallback%e5%92%8cusememo%e5%8f%aa%e9%9c%80%e8%a6%81%e4%b8%80%e4%b8%aa%e9%80%89%e9%a1%b9\/","title":{"rendered":"\u3010React\u3011\u8bd5\u7528\u4e86useCallback\u548cuseMemo\u53ea\u9700\u8981\u4e00\u4e2a\u9009\u9879"},"content":{"rendered":"<h1>useCallback \u548c useMemo \u7684\u4f7f\u7528\u65b9\u6cd5<\/h1>\n<p>\u5728\u5f00\u53d1React\u5e94\u7528\u65f6\uff0c\u6027\u80fd\u4f18\u5316\u975e\u5e38\u91cd\u8981\u3002React Hooks \u63d0\u4f9b\u4e86\u4e24\u4e2a\u94a9\u5b50\u51fd\u6570useCallback\u548cuseMemo\u3002\u5b83\u4eec\u53ef\u4ee5\u8bb0\u5fc6\u51fd\u6570\u6216\u8ba1\u7b97\u7ed3\u679c\uff0c\u907f\u514d\u6bcf\u6b21\u91cd\u65b0\u6e32\u67d3\u65f6\u751f\u6210\u65b0\u7684\u51fd\u6570\u6216\u503c\u3002\u672c\u6587\u5c06\u91cd\u70b9\u4ecb\u7ecduseCallback\u548cuseMemo\u7684\u57fa\u672c\u4f7f\u7528\u65b9\u6cd5\u3002<\/p>\n<h2>\u4f7f\u7528useCallback\u7684\u65b9\u6cd5\u3002<\/h2>\n<p>useCallback\u94a9\u5b50\u5c06\u6307\u5b9a\u7684\u56de\u8c03\u51fd\u6570\u8fdb\u884c\u8bb0\u5fc6\u5316\u3002\u8fd9\u6837\u4e00\u6765\uff0c\u5c31\u53ef\u4ee5\u9632\u6b62\u7ec4\u4ef6\u6bcf\u6b21\u91cd\u65b0\u6e32\u67d3\u65f6\u751f\u6210\u65b0\u7684\u51fd\u6570\u3002\u8fd9\u5728\u5c06\u56de\u8c03\u51fd\u6570\u4f5c\u4e3a\u5c5e\u6027\u4f20\u9012\u7ed9\u5b50\u7ec4\u4ef6\u65f6\u7279\u522b\u6709\u7528\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"nx\">React<\/span><span class=\"p\">,<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">useCallback<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">react<\/span><span class=\"dl\">\"<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">MyComponent<\/span><span class=\"p\">:<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nx\">FC<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">handleClick<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useCallback<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nf\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">Button Clicked!<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"p\">},<\/span> <span class=\"p\">[]);<\/span>\r\n\r\n  <span class=\"k\">return<\/span> <span class=\"p\">&lt;<\/span><span class=\"nt\">button<\/span> <span class=\"na\">onClick<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">handleClick<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>Click me<span class=\"p\">&lt;\/<\/span><span class=\"nt\">button<\/span><span class=\"p\">&gt;;<\/span>\r\n<span class=\"p\">};<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"k\">default<\/span> <span class=\"nx\">MyComponent<\/span>\r\n<\/code><\/pre>\n<p>\u5728\u4e0a\u8ff0\u7684\u4f8b\u5b50\u4e2d\uff0chandleClick\u51fd\u6570\u5728\u6bcf\u6b21\u91cd\u65b0\u6e32\u67d3\u65f6\u90fd\u4f7f\u7528\u76f8\u540c\u7684\u51fd\u6570\u3002\u7531\u4e8e\u4f9d\u8d56\u6570\u7ec4\u4e3a\u7a7a\uff0c\u6240\u4ee5\u4e0d\u9700\u8981\u5728\u6bcf\u6b21\u91cd\u65b0\u6e32\u67d3\u65f6\u751f\u6210\u65b0\u7684\u51fd\u6570\u3002<\/p>\n<h2>\u4f7f\u7528useMemo\u7684\u65b9\u6cd5<\/h2>\n<p>useMemo\u94a9\u5b50\u7528\u4e8e\u5bf9\u6307\u5b9a\u7684\u51fd\u6570\u8ba1\u7b97\u7ed3\u679c\u8fdb\u884c\u8bb0\u5fc6\u5316\u3002\u8fd9\u6837\u53ef\u4ee5\u907f\u514d\u5728\u91cd\u65b0\u6e32\u67d3\u65f6\u91cd\u590d\u6267\u884c\u76f8\u540c\u7684\u8ba1\u7b97\u3002\u5f53\u5728\u7ec4\u4ef6\u5185\u6267\u884c\u590d\u6742\u7684\u8ba1\u7b97\u65f6\uff0c\u8fd9\u5c06\u975e\u5e38\u6709\u7528\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"nx\">React<\/span><span class=\"p\">,<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">useMemo<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">react<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">MyComponent<\/span><span class=\"p\">:<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nx\">FC<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">expensiveCalculation<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useMemo<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"c1\">\/\/ \u91cd\u3044\u8a08\u7b97<\/span>\r\n    <span class=\"kd\">let<\/span> <span class=\"nx\">result<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">0<\/span><span class=\"p\">;<\/span>\r\n    <span class=\"k\">for <\/span><span class=\"p\">(<\/span><span class=\"kd\">let<\/span> <span class=\"nx\">i<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">0<\/span><span class=\"p\">;<\/span> <span class=\"nx\">i<\/span> <span class=\"o\">&lt;<\/span> <span class=\"mi\">1000000<\/span><span class=\"p\">;<\/span> <span class=\"nx\">i<\/span><span class=\"o\">++<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n      <span class=\"nx\">result<\/span> <span class=\"o\">+=<\/span> <span class=\"nx\">i<\/span><span class=\"p\">;<\/span>\r\n    <span class=\"p\">}<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"nx\">result<\/span><span class=\"p\">;<\/span>\r\n  <span class=\"p\">},<\/span> <span class=\"p\">[]);<\/span> <span class=\"c1\">\/\/ \u4f9d\u5b58\u914d\u5217\u304c\u7a7a\u306a\u306e\u3067\u3001\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3054\u3068\u306b\u540c\u3058\u8a08\u7b97\u7d50\u679c\u304c\u4f7f\u7528\u3055\u308c\u308b<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"nt\">div<\/span><span class=\"p\">&gt;<\/span><span class=\"si\">{<\/span><span class=\"nx\">expensiveCalculation<\/span><span class=\"si\">}<\/span><span class=\"p\">&lt;\/<\/span><span class=\"nt\">div<\/span><span class=\"p\">&gt;<\/span>\r\n  <span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"k\">default<\/span> <span class=\"nx\">MyComponent<\/span>\r\n<\/code><\/pre>\n<p>\u5728\u4e0a\u8ff0\u7684\u4f8b\u5b50\u4e2d\uff0cexpensiveCalculation\u7684\u8ba1\u7b97\u7ed3\u679c\u4f1a\u5728\u6bcf\u6b21\u91cd\u65b0\u6e32\u67d3\u65f6\u88ab\u91cd\u590d\u4f7f\u7528\u3002\u7531\u4e8e\u4f9d\u8d56\u6570\u7ec4\u4e3a\u7a7a\uff0c\u6240\u4ee5\u4e0d\u9700\u8981\u6bcf\u6b21\u91cd\u65b0\u6e32\u67d3\u65f6\u90fd\u91cd\u65b0\u6267\u884c\u8ba1\u7b97\u3002<\/p>\n<h2>\u603b\u7ed3<\/h2>\n<p>useCallback\u548cuseMemo\u662f\u63d0\u9ad8React\u5e94\u7528\u6027\u80fd\u7684\u91cd\u8981\u5de5\u5177\u3002\u901a\u8fc7\u5c06\u56de\u8c03\u51fd\u6570\u548c\u8ba1\u7b97\u7ed3\u679c\u8fdb\u884c\u8bb0\u5fc6\u5316\uff0c\u53ef\u4ee5\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u91cd\u65b0\u8ba1\u7b97\u548c\u91cd\u65b0\u751f\u6210\uff0c\u63d0\u9ad8\u7ec4\u4ef6\u7684\u6548\u7387\u3002\u901a\u8fc7\u9002\u5f53\u4f7f\u7528\u8fd9\u4e9b\u94a9\u5b50\uff0c\u53ef\u4ee5\u6784\u5efa\u66f4\u8212\u9002\u548c\u9ad8\u6548\u7684React\u5e94\u7528\u7a0b\u5e8f\u3002<\/p>\n<p>\u8fd9\u7bc7\u6587\u7ae0\u662f\u4e3a\u4e86\u5e2e\u52a9\u521d\u5b66\u8005\u5927\u5b66\u751f\u7406\u89e3React Next\u800c\u51c6\u5907\u7684\u8f93\u51fa\u8d44\u6599\u3002\u671f\u5f85\u60a8\u7684\u6279\u8bc4\u3001\u610f\u89c1\u7b49\u8bc4\u8bba\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>useCallback \u548c useMemo \u7684\u4f7f\u7528\u65b9\u6cd5 \u5728\u5f00\u53d1React\u5e94\u7528\u65f6\uff0c\u6027\u80fd\u4f18\u5316\u975e\u5e38\u91cd\u8981\u3002React  [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-38099","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) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u3010React\u3011\u8bd5\u7528\u4e86useCallback\u548cuseMemo\u53ea\u9700\u8981\u4e00\u4e2a\u9009\u9879 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u3010react\u3011\u8bd5\u7528\u4e86usecallback\u548cusememo\u53ea\u9700\u8981\u4e00\u4e2a\u9009\u9879\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u3010React\u3011\u8bd5\u7528\u4e86useCallback\u548cuseMemo\u53ea\u9700\u8981\u4e00\u4e2a\u9009\u9879\" \/>\n<meta property=\"og:description\" content=\"useCallback \u548c useMemo \u7684\u4f7f\u7528\u65b9\u6cd5 \u5728\u5f00\u53d1React\u5e94\u7528\u65f6\uff0c\u6027\u80fd\u4f18\u5316\u975e\u5e38\u91cd\u8981\u3002React [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u3010react\u3011\u8bd5\u7528\u4e86usecallback\u548cusememo\u53ea\u9700\u8981\u4e00\u4e2a\u9009\u9879\/\" \/>\n<meta property=\"og:site_name\" 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