{"id":38178,"date":"2023-07-31T06:20:45","date_gmt":"2023-04-16T00:30:31","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90react%e3%80%91%e4%bd%bf%e7%94%a8useeffect\/"},"modified":"2024-04-30T16:14:37","modified_gmt":"2024-04-30T08:14:37","slug":"%e3%80%90react%e3%80%91%e4%bd%bf%e7%94%a8useeffect","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90react%e3%80%91%e4%bd%bf%e7%94%a8useeffect\/","title":{"rendered":"\u3010React\u3011\u4f7f\u7528useEffect"},"content":{"rendered":"<h1>useEffect\u662f\u4ec0\u4e48<\/h1>\n<p>useEffect\u662fHooks\u7684\u5176\u4e2d\u4e00\u4e2a\u529f\u80fd\uff0c\u7528\u4e8e\u63a7\u5236\u7ec4\u4ef6\u7684\u526f\u4f5c\u7528\u3002\u5177\u4f53\u6765\u8bf4\uff0c\u5b83\u662f\u7528\u6765\u5b9e\u73b0\u201c\u4ec5\u5f53\u67d0\u4e2a\u503c\u53d1\u751f\u53d8\u5316\u65f6\u624d\u6267\u884c\u67d0\u4e2a\u64cd\u4f5c\u201d\u7684\u529f\u80fd\u3002<\/p>\n<h1>useEffect\u7684\u4f7f\u7528\u65b9\u6cd5<\/h1>\n<p>\u8981\u4f7f\u7528useEffect\uff0c\u9700\u8981\u5bfc\u5165Hooks\uff0c\u5982\u4e0b\u6240\u793a\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">useEffect<\/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<\/code><\/pre>\n<p>\u4ee5\u4e0b\u662fuseEffect\u7684\u8bed\u6cd5\u7ed3\u6784\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=\"cm\">\/* \u5b9f\u884c\u3055\u305b\u305f\u3044\u51e6\u7406\u3092\u8a18\u8ff0*\/<\/span>\r\n<span class=\"p\">},<\/span> <span class=\"p\">[<\/span><span class=\"nx\">\u4f9d\u5b58\u3059\u308b\u5909\u6570\u306e\u914d\u5217<\/span><span class=\"p\">]);<\/span>\r\n<\/code><\/pre>\n<p>\u5728\u4e2d\u56fd\u81ea\u7136\u8bed\u8a00\u4e2d\uff0c\u53ea\u9700\u8981\u4e00\u4e2a\u9009\u9879\uff1a\u7528\u7bad\u5934\u51fd\u6570\u6765\u63cf\u8ff0\u7b2c\u4e00\u4e2a\u53c2\u6570\u7684\u5904\u7406\uff0c\u5e76\u4e14\u7b2c\u4e8c\u4e2a\u53c2\u6570\u5fc5\u987b\u6307\u5b9a\u4e3a\u4e00\u4e2a\u6570\u7ec4\u3002\u5982\u679c\u8981\u591a\u6b21\u6307\u5b9a\uff0c\u5219\u5e94\u8be5\u5199\u6210[num1, num2]\u7684\u5f62\u5f0f\u3002<\/p>\n<p>\u6ce8\u610f\uff1auseEffect\u5728\u4f9d\u8d56\u6570\u7ec4\u4e2d\u6307\u5b9a\u7684\u503c\u53d1\u751f\u53d8\u5316\u65f6\uff0c\u4ee5\u53ca\u7ec4\u4ef6\u6302\u8f7d\uff08\u9996\u6b21\u6e32\u67d3\uff09\u65f6\u90fd\u4f1a\u88ab\u6267\u884c\u3002\u56e0\u6b64\uff0c\u5982\u679c\u5c06\u7b2c\u4e8c\u4e2a\u53c2\u6570\u8bbe\u7f6e\u4e3a[]\uff0c\u5219\u53ef\u4ee5\u7f16\u5199\u53ea\u5728\u663e\u793a\u7ec4\u4ef6\u7684\u7b2c\u4e00\u6b21\u65f6\u6267\u884c\u7684\u903b\u8f91\u3002\u8fd9\u5728\u83b7\u53d6\u521d\u59cb\u6570\u636e\u65f6\u7ecf\u5e38\u4f7f\u7528\u3002<\/p>\n<h1>useEffect\u7684\u7b80\u5355\u793a\u4f8b<\/h1>\n<p>\u5982\u679c\u53ea\u60f3\u5728&#8221;num&#8221;\u72c0\u614b\u503c\u767c\u751f\u6539\u8b8a\u6642\u986f\u793a\u8b66\u5831\uff0c\u53ef\u4ee5\u6309\u7167\u4ee5\u4e0b\u65b9\u5f0f\u9032\u884c\u7de8\u5beb\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">useState<\/span><span class=\"p\">,<\/span> <span class=\"nx\">useEffect<\/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\">App<\/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=\"p\">[<\/span><span class=\"nx\">num<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setNum<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">(<\/span><span class=\"mi\">0<\/span><span class=\"p\">);<\/span>\r\n\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">onClickButton<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"nf\">setNum<\/span><span class=\"p\">(<\/span><span class=\"nx\">num<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">1<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"p\">};<\/span>\r\n\r\n    <span class=\"nf\">useEffect<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"nf\">alert<\/span><span class=\"p\">();<\/span>\r\n    <span class=\"p\">},<\/span> <span class=\"p\">[<\/span><span class=\"nx\">num<\/span><span class=\"p\">]);<\/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>\r\n            <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\">onClickButton<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>\u30dc\u30bf\u30f3<span class=\"p\">&lt;\/<\/span><span class=\"nt\">button<\/span><span class=\"p\">&gt;<\/span>\r\n            <span class=\"p\">&lt;<\/span><span class=\"nt\">p<\/span><span class=\"p\">&gt;<\/span><span class=\"si\">{<\/span><span class=\"nx\">num<\/span><span class=\"si\">}<\/span><span class=\"p\">&lt;\/<\/span><span class=\"nt\">p<\/span><span class=\"p\">&gt;<\/span>\r\n        <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<\/code><\/pre>\n<h1>\u6700\u7ec8<\/h1>\n<p>\u975e\u5e38\u611f\u8c22\u4f60\u9605\u8bfb\u5230\u8fd9\u91cc\uff01\u8fd9\u6b21\u53ea\u662f\u6db5\u76d6\u4e86\u5173\u4e8euseEffect\u57fa\u672c\u7684\u90e8\u5206\uff0c\u5173\u4e8e\u5176\u4ed6\u6e32\u67d3\u4f18\u5316\u7684\u5185\u5bb9\uff0c\u6211\u5c06\u53e6\u5916\u53d1\u5e03\u4e00\u7bc7\u6587\u7ae0\uff0c\u5728\u90a3\u7bc7\u6587\u7ae0\u4e2d\u4f60\u53ef\u4ee5\u53c2\u8003\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>useEffect\u662f\u4ec0\u4e48 useEffect\u662fHooks\u7684\u5176\u4e2d\u4e00\u4e2a\u529f\u80fd\uff0c\u7528\u4e8e\u63a7\u5236\u7ec4\u4ef6\u7684\u526f\u4f5c\u7528\u3002\u5177\u4f53\u6765\u8bf4\uff0c\u5b83\u662f\u7528 [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-38178","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\u4f7f\u7528useEffect - 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\u4f7f\u7528useeffect\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u3010React\u3011\u4f7f\u7528useEffect\" \/>\n<meta property=\"og:description\" content=\"useEffect\u662f\u4ec0\u4e48 useEffect\u662fHooks\u7684\u5176\u4e2d\u4e00\u4e2a\u529f\u80fd\uff0c\u7528\u4e8e\u63a7\u5236\u7ec4\u4ef6\u7684\u526f\u4f5c\u7528\u3002\u5177\u4f53\u6765\u8bf4\uff0c\u5b83\u662f\u7528 [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u3010react\u3011\u4f7f\u7528useeffect\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2023-04-16T00:30:31+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-04-30T08:14:37+00:00\" \/>\n<meta name=\"author\" content=\"\u97f5, \u79d1\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u97f5, \u79d1\" \/>\n<script type=\"application\/ld+json\" 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