{"id":38433,"date":"2023-03-18T19:17:51","date_gmt":"2023-04-14T07:23:28","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%88%91%e8%ae%a4%e4%b8%bavanjs%e7%9a%84derive-api%e5%9c%a8%e4%b8%89%e4%b8%aa%e6%96%b9%e9%9d%a2%e6%af%94react%e7%9a%84useeffect%e5%92%8cusememo%e6%9b%b4%e8%81%aa%e6%98%8e%e3%80%82\/"},"modified":"2024-01-15T09:55:30","modified_gmt":"2024-01-15T01:55:30","slug":"%e6%88%91%e8%ae%a4%e4%b8%bavanjs%e7%9a%84derive-api%e5%9c%a8%e4%b8%89%e4%b8%aa%e6%96%b9%e9%9d%a2%e6%af%94react%e7%9a%84useeffect%e5%92%8cusememo%e6%9b%b4%e8%81%aa%e6%98%8e%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%88%91%e8%ae%a4%e4%b8%bavanjs%e7%9a%84derive-api%e5%9c%a8%e4%b8%89%e4%b8%aa%e6%96%b9%e9%9d%a2%e6%af%94react%e7%9a%84useeffect%e5%92%8cusememo%e6%9b%b4%e8%81%aa%e6%98%8e%e3%80%82\/","title":{"rendered":"\u6211\u8ba4\u4e3aVanJS\u7684derive API\u5728\u4e09\u4e2a\u65b9\u9762\u6bd4React\u7684useEffect\u548cuseMemo\u66f4\u806a\u660e"},"content":{"rendered":"<p>VanJS\u4e2d\u6709\u4e00\u4e2a\u540d\u4e3avan.derive\u7684API\u3002\u5b83\u53ef\u4ee5\u4f20\u9012\u4e00\u4e2a\u56de\u8c03\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\uff0c\u5f53\u4f7f\u7528\u7684State\u53d8\u91cf\u7684\u503c\u53d1\u751f\u53d8\u5316\u65f6\uff0c\u56de\u8c03\u51fd\u6570\u5c06\u88ab\u6267\u884c\u3002\u5bf9\u4e8eReact\u7528\u6237\u6765\u8bf4\uff0c\u53ef\u4ee5\u5c06\u5176\u7406\u89e3\u4e3a\u53ef\u4ee5\u5b9e\u73b0\u7c7b\u4f3c\u4e8euseEffect\u6216\u8005useMemo\u7684\u529f\u80fd\u3002\u5c3d\u7ba1\u529f\u80fd\u5e76\u4e0d\u5b8c\u5168\u76f8\u540c\uff0c\u8bf7\u6ce8\u610f\u3002<\/p>\n<p>\u7136\u800c\uff0c\u6211\u8ba4\u4e3a\u5b9e\u9645\u4e0a\u4f7f\u7528van.derive\u6bd4React\u7684useEffect\u548cuseMemo\u66f4\u52a0\u667a\u80fd\uff0c\u6240\u4ee5\u6211\u60f3\u4ecb\u7ecd\u4e09\u4e2a\u65b9\u9762\u3002<\/p>\n<h2>\u539f\u56e0<\/h2>\n<h3>\u8bf7\u4e0d\u8981\u4f7f\u7528\u7b2c\u4e8c\u4e2a\u53c2\u6570\u3002<\/h3>\n<p>React\u7684useEffect\u548cuseMemo\u53ef\u4ee5\u901a\u8fc7\u7b2c\u4e8c\u4e2a\u53c2\u6570\u6765\u6307\u5b9a\u5728\u54ea\u4e2a\u53d8\u91cf\u6539\u53d8\u65f6\u6267\u884c\u56de\u8c03\u51fd\u6570\u3002\uff08\u867d\u7136\u53ef\u4ee5\u9009\u62e9\u4e0d\u6307\u5b9a\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff0c\u4f46\u662f\u8fd9\u6837\u4f1a\u6539\u53d8\u7528\u9014\uff0c\u672c\u6b21\u4e0d\u8003\u8651\u8fd9\u79cd\u60c5\u51b5\uff09<\/p>\n<p>\u5982\u679c\u60f3\u8981\u5728React\u7684useEffect\u4e2d\uff0c\u6bcf\u5f53count\u7684\u503c\u53d1\u751f\u53d8\u5316\u65f6\u90fd\u6267\u884c\u56de\u8c03\u51fd\u6570\uff0c\u53ef\u4ee5\u6309\u7167\u4ee5\u4e0b\u65b9\u5f0f\u7f16\u5199\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nf\">useEffect<\/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=\"nx\">count<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">},<\/span> <span class=\"p\">[<\/span><span class=\"nx\">count<\/span><span class=\"p\">])<\/span>\r\n<\/code><\/pre>\n<p>\u7136\u800c\uff0cVanJS\u4e0d\u9700\u8981\u6307\u5b9a\u7b2c\u4e8c\u4e2a\u53c2\u6570\u3002\u5982\u679c\u5728\u56de\u8c03\u51fd\u6570\u4e2d\u4f7f\u7528\u4e86State\u53d8\u91cf\uff0c\u6bcf\u6b21\u8be5\u503c\u53d1\u751f\u53d8\u5316\u65f6\uff0c\u56de\u8c03\u51fd\u6570\u5c06\u81ea\u52a8\u6267\u884c\u3002\u5728\u4e0b\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u5f53count\u7684\u503c\u53d1\u751f\u53d8\u5316\u65f6\uff0c\u56de\u8c03\u51fd\u6570\u5c06\u88ab\u81ea\u52a8\u6267\u884c\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nx\">van<\/span><span class=\"p\">.<\/span><span class=\"nf\">derive<\/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=\"nx\">count<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">})<\/span>\r\n<\/code><\/pre>\n<p>\u53ef\u80fd\u6709\u4e9b\u7ec6\u5fae\u7684\u4e8b\u60c5\uff0c\u4f46\u662f\u56e0\u4e3a\u53ef\u4ee5\u7701\u53bb\u4e13\u95e8\u6307\u5b9a\u53d8\u91cf\uff0c\u6240\u4ee5\u4ee3\u7801\u7684\u7f16\u5199\u91cf\u4f1a\u51cf\u5c11\uff0c\u5e76\u4e14\u53ef\u4ee5\u907f\u514d\u56e0\u4e3a\u5fd8\u8bb0\u6307\u5b9a\u53d8\u91cf\u800c\u5bfc\u81f4\u7684\u9519\u8bef\u3002<\/p>\n<h3>2. \u53ef\u4ee5\u540c\u65f6\u652f\u6301useEffect\u548cuseMemo\u3002<\/h3>\n<p>van.derive\u53ef\u4ee5\u540c\u65f6\u5b9e\u73b0React\u7684useEffect\u548cuseMemo\u7684\u529f\u80fd\u3002<\/p>\n<p>\u56e0\u4e3a\u6211\u4eec\u5df2\u7ecf\u57281\u4e2d\u89e3\u91ca\u4e86`useEffect`\u7684\u4f5c\u7528\uff0c\u6240\u4ee5\u6b64\u5904\u7701\u7565\u3002<\/p>\n<p>\u5728\u4f7f\u7528React\u7684useMemo\u65f6\uff0c\u60a8\u53ef\u4ee5\u6309\u7167\u4ee5\u4e0b\u65b9\u5f0f\u7f16\u5199\u4ee3\u7801\u3002\u6bcf\u5f53count\u7684\u503c\u6539\u53d8\u65f6\uff0c\u56de\u8c03\u51fd\u6570\u5c06\u88ab\u6267\u884c\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">calculateExpensiveValue<\/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=\"kd\">let<\/span> <span class=\"nx\">result<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">0<\/span>\r\n\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=\"nx\">count<\/span> <span class=\"o\">*<\/span> <span class=\"mi\">100000000<\/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\r\n  <span class=\"k\">return<\/span> <span class=\"nx\">result<\/span>\r\n<span class=\"p\">},<\/span> <span class=\"p\">[<\/span><span class=\"nx\">count<\/span><span class=\"p\">])<\/span>\r\n<\/code><\/pre>\n<p>\u5982\u679c\u8981\u5728VanJS\u4e2d\u5b9e\u73b0useMemo\u7684\u529f\u80fd\uff0c\u53ea\u9700\u7c7b\u4f3c\u5730\u58f0\u660e\u4e00\u4e2a\u53d8\u91cf\u5e76\u901a\u8fc7return\u8fd4\u56de\u503c\u5373\u53ef\uff0c\u4e0d\u9700\u8981\u7b2c\u4e8c\u4e2a\u53c2\u6570\u3002\u5728\u4e0b\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c\u5f53count\u7684\u503c\u53d1\u751f\u53d8\u5316\u65f6\uff0c\u56de\u8c03\u51fd\u6570\u4f1a\u81ea\u52a8\u6267\u884c\u5e76\u6539\u53d8calculateExpensiveValue\u7684\u503c\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">calculateExpensiveValue<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">van<\/span><span class=\"p\">.<\/span><span class=\"nf\">derive<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">let<\/span> <span class=\"nx\">result<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">0<\/span>\r\n\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=\"nx\">count<\/span><span class=\"p\">.<\/span><span class=\"nx\">val<\/span> <span class=\"o\">*<\/span> <span class=\"mi\">100000000<\/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>\r\n  <span class=\"p\">}<\/span>\r\n\r\n  <span class=\"k\">return<\/span> <span class=\"nx\">result<\/span>\r\n<span class=\"p\">})<\/span>\r\n<\/code><\/pre>\n<h3>3.\u6267\u884c\u6700\u5c0f\u7a0b\u5ea6\u7684\u51fd\u6570<\/h3>\n<p>\u6211\u89c9\u5f97\u770b\u5230\u5b9e\u9645\u52a8\u4f5c\u4f1a\u66f4\u5bb9\u6613\u7406\u89e3\uff0c\u6240\u4ee5\u6211\u51c6\u5907\u4e86\u4e00\u4e2aDEMO\u3002\u60a8\u53ef\u4ee5\u4f7f\u7528\u6d4f\u89c8\u5668\u7684\u9a8c\u8bc1\u5de5\u5177\u67e5\u770b\u63a7\u5236\u53f0\u65e5\u5fd7\uff0c\u4ee5\u786e\u5b9a\u5728\u54ea\u4e9b\u6761\u4ef6\u4e0b\u56de\u8c03\u51fd\u6570\u4f1a\u88ab\u6267\u884c\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u5728React\u4e2d\uff0c\u65e0\u8bbatoggle\u3001toggle2\u8fd8\u662ftoggle3\u7684\u503c\u53d1\u751f\u53d8\u5316\uff0c\u90fd\u4f1a\u89e6\u53d1\u56de\u8c03\u51fd\u6570\u7684\u6267\u884c\u3002<\/p>\n<p>\u5982\u679c\u5728VanJS\u4e2d\uff0c\u5982\u679ctoggle\u4e3afalse\uff0c\u5219\u65e0\u8bba\u66f4\u6539toggle2\u6216toggle3\u7684\u503c\u5982\u4f55\uff0c\u56de\u8c03\u51fd\u6570\u90fd\u4e0d\u4f1a\u88ab\u6267\u884c\u3002\u8fd9\u662f\u56e0\u4e3a\u5982\u679ctoggle\u4e3afalse\uff0c\u90a3\u4e48if\u8bed\u53e5\u7684\u7b2c\u4e00\u4e2a\u6761\u4ef6toggle1.val\u5c06\u603b\u662f\u4e3a\u5047\uff0c\u4e0d\u9700\u8981\u518d\u68c0\u67e5\u540e\u7eed\u6761\u4ef6!toggle2.val &amp;&amp; !toggle3.val\u7684\u503c\u3002<\/p>\n<h2>\u603b\u7ed3<\/h2>\n<p>\u4ee5\u4e0b\u662f\u6211\u8ba4\u4e3a VanJS \u7684 van.derive API \u76f8\u6bd4\u4e8e React \u7684 useEffect \u548c useMemo \u66f4\u806a\u660e\u7684\u4e09\u4e2a\u65b9\u9762\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5b83\u4eec\u5e76\u4e0d\u5b8c\u5168\u76f8\u540c\uff0c\u4f46\u6211\u89c9\u5f97 van.derive API \u4f3c\u4e4e\u662f\u5c3d\u529b\u8003\u8651\u4e86\u6027\u80fd\u7684\u3002<\/p>\n<h2>\u6700\u540e<\/h2>\n<h3>\u6211\u4eec\u6b63\u5728GoQSystem\u62db\u52df\u4e00\u8d77\u5de5\u4f5c\u7684\u4f19\u4f34\uff01<\/h3>\n<p>\u5982\u679c\u60a8\u5bf9\u6b64\u611f\u5174\u8da3\uff0c\u8bf7\u70b9\u51fb\u4e0b\u65b9\u94fe\u63a5\u8fdb\u884c\u786e\u8ba4\u3002<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>VanJS\u4e2d\u6709\u4e00\u4e2a\u540d\u4e3avan.derive\u7684API\u3002\u5b83\u53ef\u4ee5\u4f20\u9012\u4e00\u4e2a\u56de\u8c03\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\uff0c\u5f53\u4f7f\u7528\u7684State\u53d8\u91cf\u7684\u503c [&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-38433","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>\u6211\u8ba4\u4e3aVanJS\u7684derive API\u5728\u4e09\u4e2a\u65b9\u9762\u6bd4React\u7684useEffect\u548cuseMemo\u66f4\u806a\u660e - 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\/\u6211\u8ba4\u4e3avanjs\u7684derive-api\u5728\u4e09\u4e2a\u65b9\u9762\u6bd4react\u7684useeffect\u548cusememo\u66f4\u806a\u660e\u3002\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u6211\u8ba4\u4e3aVanJS\u7684derive API\u5728\u4e09\u4e2a\u65b9\u9762\u6bd4React\u7684useEffect\u548cuseMemo\u66f4\u806a\u660e\" \/>\n<meta property=\"og:description\" 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