{"id":38495,"date":"2023-01-25T06:34:43","date_gmt":"2022-11-13T23:24:34","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8e-react-%e7%8a%b6%e6%80%81-react-state\/"},"modified":"2024-04-29T11:23:44","modified_gmt":"2024-04-29T03:23:44","slug":"%e5%85%b3%e4%ba%8e-react-%e7%8a%b6%e6%80%81-react-state","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8e-react-%e7%8a%b6%e6%80%81-react-state\/","title":{"rendered":"\u5173\u4e8e React \u72b6\u6001 (React State)"},"content":{"rendered":"<h1>\u9996\u5148<\/h1>\n<p>\u901a\u8fc7\u4f7f\u7528state\u7684\u529f\u80fd\uff0c\u53ef\u4ee5\u7b80\u6d01\u800c\u660e\u786e\u5730\u63cf\u8ff0\u72b6\u6001\u8f6c\u6362\u7684\u903b\u8f91\u3002\u53ef\u4ee5\u901a\u8fc7\u6b63\u5f0f\u8c03\u7528\uff0c\u5728\u6570\u884c\u4ee3\u7801\u4e2d\u5b9e\u73b0\u590d\u6742\u7684\u72b6\u6001\u8f6c\u6362\u5904\u7406\u3002<\/p>\n<p>\u53e6\u5916\uff0c\u5728React 16.8\u4e2d\u6dfb\u52a0\u4e86\u4e00\u9879\u540d\u4e3a&#8221;hook&#8221;\u7684\u65b0\u529f\u80fd\uff0c\u4f7f\u5f97\u53ef\u4ee5\u5728\u4e0d\u7f16\u5199\u7c7b\u7ec4\u4ef6\u7684\u60c5\u51b5\u4e0b\u4f7f\u7528React\u7684\u8bf8\u591a\u529f\u80fd\uff0c\u5305\u62ecstate\u3002<br \/>\n\u5728hook\u5b9e\u73b0\u4e4b\u524d\uff0c\u5e38\u89c1\u7684\u505a\u6cd5\u662f\u4f7f\u7528\u7c7b\u7ec4\u4ef6\u7684\u8bed\u6cd5\u6765\u4f7f\u7528state\u7b49\u529f\u80fd\u3002<br \/>\n\u901a\u8fc7hook\u7684\u5b9e\u73b0\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u51fd\u6570\u7ec4\u4ef6\u4e2d\u4f7f\u7528state\u7b49\u529f\u80fd\uff0c\u5e76\u4e14\u5b9e\u73b0\u76f8\u5bf9\u7b80\u5355\u3002<\/p>\n<p>\u6211\u5b9e\u9645\u4e0a\u6ca1\u6709\u5728\u7c7b\u7ec4\u4ef6\u4e2d\u4f7f\u7528\u8fc7hook\u7684\u7ecf\u9a8c\uff0c\u4f46\u662f\u5f53\u6211\u6bd4\u8f83\u4f7f\u7528\u51fd\u6570\u7ec4\u4ef6\u65f6\u7684\u5b9e\u73b0\u548c\u4ee3\u7801\u65f6\uff0c\u7406\u89e3\u8d77\u6765\u53ef\u80fd\u9700\u8981\u4e00\u4e9b\u65f6\u95f4\u3002<\/p>\n<h1>Reshaping the sentence and providing a similar meaning in Chinese:<\/h1>\n<p>\u72b6\u6001\u6302\u94a9<\/p>\n<ul class=\"post-ul\">\u4f8b<\/ul>\n<pre class=\"post-pre\"><code> <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">count<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setCount<\/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<\/code><\/pre>\n<p>useState\u7684\u53c2\u6570\u662f\u8be5\u72b6\u6001\u7684\u521d\u59cb\u503c\uff0ccount\u7684\u503c\u4e3a&#8221;0&#8243;\u3002<br \/>\nsetCount\u662f\u7528\u4e8e\u66f4\u65b0count\u503c\u7684\u51fd\u6570\uff0c\u53ea\u80fd\u901a\u8fc7\u5b83\u6765\u4fee\u6539count\u7684\u503c\u3002<\/p>\n<ul class=\"post-ul\">\u30af\u30ea\u30c3\u30af\u3059\u308b\u5ea6\u306b\u30ab\u30a6\u30f3\u30c8\u304c\u9032\u3093\u3067\u3044\u304f\u4f8b<\/ul>\n<pre class=\"post-pre\"><code><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=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nf\">setCount<\/span><span class=\"p\">(<\/span><span class=\"nx\">count<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">1<\/span><span class=\"p\">)<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>\r\n    Click me\r\n<span class=\"p\">&lt;\/<\/span><span class=\"nt\">button<\/span><span class=\"p\">&gt;<\/span>\r\n<\/code><\/pre>\n<p>\u6b64\u5916\uff0c\u4e0e\u5176\u4ed6\u94a9\u5b50\u529f\u80fd\u7ed3\u5408\u4f7f\u7528\uff0c\u8fd8\u53ef\u4ee5\u5b9e\u73b0\u5404\u79cd\u5176\u4ed6\u529f\u80fd\u3002<\/p>\n<h1>\u5176\u4ed6\u94a9\u5b50<\/h1>\n<h2>\u6548\u679c gu\u01d2)<\/h2>\n<p>\u901a\u8fc7\u4f20\u9012`state`\u53c2\u6570\uff0c\u53ef\u4ee5\u63a7\u5236\u6e32\u67d3\u7684\u65f6\u673a\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=\"dl\">\"<\/span><span class=\"s2\">\u30ec\u30f3\u30c0\u30fc\u3055\u308c\u307e\u3057\u305f\u3002<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\r\n<span class=\"p\">},<\/span> <span class=\"p\">[<\/span><span class=\"nx\">state<\/span><span class=\"p\">]);<\/span>\r\n<\/code><\/pre>\n<h2>\u8bf7\u7528\u6c49\u8bed\u5c06\u4ee5\u4e0b\u5185\u5bb9\u8fdb\u884c\u91ca\u4e49\uff0c\u53ea\u9700\u8981\u63d0\u4f9b\u4e00\u79cd\u9009\u9879\uff1a<\/h2>\n<p>\u80cc\u666f\u4fe1\u606f\u3002<\/p>\n<p>\u53ef\u4ee5\u7ba1\u7406\u6837\u5f0f\u7684\u72b6\u6001\u8f6c\u6362<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">themes<\/span> <span class=\"o\">=<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"na\">light<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"na\">foreground<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">#000000<\/span><span class=\"dl\">\"<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"na\">background<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">#eeeeee<\/span><span class=\"dl\">\"<\/span>\r\n  <span class=\"p\">},<\/span>\r\n  <span class=\"na\">dark<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"na\">foreground<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">#ffffff<\/span><span class=\"dl\">\"<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"na\">background<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">#222222<\/span><span class=\"dl\">\"<\/span>\r\n  <span class=\"p\">}<\/span>\r\n<span class=\"p\">};<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">ThemeContext<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nf\">createContext<\/span><span class=\"p\">(<\/span><span class=\"nx\">themes<\/span><span class=\"p\">.<\/span><span class=\"nx\">light<\/span><span class=\"p\">);<\/span>\r\n\r\n<span class=\"kd\">function<\/span> <span class=\"nf\">App<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"nc\">ThemeContext<\/span><span class=\"p\">.<\/span><span class=\"nc\">Provider<\/span> <span class=\"na\">value<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">themes<\/span><span class=\"p\">.<\/span><span class=\"nx\">dark<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">Toolbar<\/span> <span class=\"p\">\/&gt;<\/span>\r\n    <span class=\"p\">&lt;\/<\/span><span class=\"nc\">ThemeContext<\/span><span class=\"p\">.<\/span><span class=\"nc\">Provider<\/span><span class=\"p\">&gt;<\/span>\r\n  <span class=\"p\">);<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"kd\">function<\/span> <span class=\"nf\">Toolbar<\/span><span class=\"p\">(<\/span><span class=\"nx\">props<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\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=\"nc\">ThemedButton<\/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\r\n<span class=\"kd\">function<\/span> <span class=\"nf\">ThemedButton<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">theme<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useContext<\/span><span class=\"p\">(<\/span><span class=\"nx\">ThemeContext<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"nt\">button<\/span> <span class=\"na\">style<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"p\">{<\/span> <span class=\"na\">background<\/span><span class=\"p\">:<\/span> <span class=\"nx\">theme<\/span><span class=\"p\">.<\/span><span class=\"nx\">background<\/span><span class=\"p\">,<\/span> <span class=\"na\">color<\/span><span class=\"p\">:<\/span> <span class=\"nx\">theme<\/span><span class=\"p\">.<\/span><span class=\"nx\">foreground<\/span> <span class=\"p\">}<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>\r\n      I am styled by theme context!\r\n    <span class=\"p\">&lt;\/<\/span><span class=\"nt\">button<\/span><span class=\"p\">&gt;<\/span>\r\n  <span class=\"p\">);<\/span>\r\n<\/code><\/pre>\n<h1>\u7d50\u5c3e<\/h1>\n<p>\u6211\u521a\u521a\u5f00\u59cb\u5b66\u4e60React\uff0c\u4f46\u5e0c\u671b\u80fd\u591f\u8fdb\u4e00\u6b65\u52a0\u6df1\u6211\u7684\u77e5\u8bc6\uff0c\u5c06\u6765\u80fd\u591f\u5206\u4eab\u6709\u4ef7\u503c\u7684\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9996\u5148 \u901a\u8fc7\u4f7f\u7528state\u7684\u529f\u80fd\uff0c\u53ef\u4ee5\u7b80\u6d01\u800c\u660e\u786e\u5730\u63cf\u8ff0\u72b6\u6001\u8f6c\u6362\u7684\u903b\u8f91\u3002\u53ef\u4ee5\u901a\u8fc7\u6b63\u5f0f\u8c03\u7528\uff0c\u5728\u6570\u884c\u4ee3\u7801\u4e2d\u5b9e\u73b0\u590d\u6742\u7684\u72b6 [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-38495","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>\u5173\u4e8e React \u72b6\u6001 (React State) - 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\/\u5173\u4e8e-react-\u72b6\u6001-react-state\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u5173\u4e8e React \u72b6\u6001 (React State)\" \/>\n<meta property=\"og:description\" content=\"\u9996\u5148 \u901a\u8fc7\u4f7f\u7528state\u7684\u529f\u80fd\uff0c\u53ef\u4ee5\u7b80\u6d01\u800c\u660e\u786e\u5730\u63cf\u8ff0\u72b6\u6001\u8f6c\u6362\u7684\u903b\u8f91\u3002\u53ef\u4ee5\u901a\u8fc7\u6b63\u5f0f\u8c03\u7528\uff0c\u5728\u6570\u884c\u4ee3\u7801\u4e2d\u5b9e\u73b0\u590d\u6742\u7684\u72b6 [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u5173\u4e8e-react-\u72b6\u6001-react-state\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2022-11-13T23:24:34+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-04-29T03:23:44+00:00\" \/>\n<meta name=\"author\" content=\"\u6e05, \u5b87\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u6e05, \u5b87\" \/>\n\t<meta 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