{"id":37984,"date":"2023-06-11T07:16:12","date_gmt":"2023-12-05T06:18:53","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90%e5%93%8d%e5%ba%94%e3%80%91%e5%b0%9d%e8%af%95%e4%bd%bf%e7%94%a8usecontext\/"},"modified":"2024-04-30T08:19:56","modified_gmt":"2024-04-30T00:19:56","slug":"%e3%80%90%e5%93%8d%e5%ba%94%e3%80%91%e5%b0%9d%e8%af%95%e4%bd%bf%e7%94%a8usecontext","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90%e5%93%8d%e5%ba%94%e3%80%91%e5%b0%9d%e8%af%95%e4%bd%bf%e7%94%a8usecontext\/","title":{"rendered":"\u3010\u54cd\u5e94\u3011\u5c1d\u8bd5\u4f7f\u7528useContext"},"content":{"rendered":"<h2>useContext\u7684\u4f7f\u7528\u65b9\u6cd5<\/h2>\n<p>useContext\u662f\u7528\u4e8e\u901a\u8fc7React\u4e0a\u4e0b\u6587\u5171\u4eab\u5168\u5c40\u72b6\u6001\u7684\u5de5\u5177\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528useContext\u7684\u57fa\u672c\u65b9\u6cd5\u3002<br \/>\n\u6211\u4eec\u5c06\u4f7f\u7528context\u6765\u5b9e\u73b0\u8ba1\u6570\u5668\u5e94\u7528\u7a0b\u5e8f\u3002<\/p>\n<h3>1. \u578b\u522b\u5b9a\u4e49<\/h3>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">Dispatch<\/span><span class=\"p\">,<\/span> <span class=\"nx\">SetStateAction<\/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=\"k\">export<\/span> <span class=\"kr\">interface<\/span> <span class=\"nx\">CounterContextProps<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"nl\">count<\/span><span class=\"p\">:<\/span> <span class=\"kr\">number<\/span><span class=\"p\">;<\/span>\r\n  <span class=\"nl\">setCount<\/span><span class=\"p\">:<\/span> <span class=\"nx\">Dispatch<\/span><span class=\"o\">&lt;<\/span><span class=\"nx\">SetStateAction<\/span><span class=\"o\">&lt;<\/span><span class=\"kr\">number<\/span><span class=\"o\">&gt;&gt;<\/span><span class=\"p\">;<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h3>2. \u521b\u5efa\u63d0\u4f9b\u4e0a\u4e0b\u6587\u7684\u7ec4\u4ef6<\/h3>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">createContext<\/span><span class=\"p\">,<\/span> <span class=\"nx\">ReactNode<\/span><span class=\"p\">,<\/span> <span class=\"nx\">useState<\/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<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">CounterContextType<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">..\/..\/types\/counter<\/span><span class=\"dl\">\"<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">CounterContext<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">createContext<\/span><span class=\"o\">&lt;<\/span><span class=\"nx\">CounterContextType<\/span> <span class=\"o\">|<\/span> <span class=\"kc\">null<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">(<\/span><span class=\"kc\">null<\/span><span class=\"p\">);<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">CounterProvider<\/span><span class=\"p\">:<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nx\">FC<\/span><span class=\"o\">&lt;<\/span><span class=\"p\">{<\/span> <span class=\"na\">children<\/span><span class=\"p\">:<\/span> <span class=\"nx\">ReactNode<\/span> <span class=\"p\">}<\/span><span class=\"o\">&gt;<\/span> <span class=\"o\">=<\/span> <span class=\"p\">({<\/span> <span class=\"nx\">children<\/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\">count<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setCount<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">useState<\/span><span class=\"o\">&lt;<\/span><span class=\"kr\">number<\/span><span class=\"o\">&gt;<\/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=\"na\">contextValue<\/span><span class=\"p\">:<\/span> <span class=\"nx\">CounterContextType<\/span> <span class=\"o\">=<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nx\">count<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"nx\">setCount<\/span><span class=\"p\">,<\/span>\r\n  <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=\"nc\">CounterContext<\/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\">contextValue<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>\r\n      <span class=\"si\">{<\/span><span class=\"nx\">children<\/span><span class=\"si\">}<\/span>\r\n    <span class=\"p\">&lt;\/<\/span><span class=\"nc\">CounterContext<\/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=\"k\">export<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">CounterContext<\/span><span class=\"p\">,<\/span> <span class=\"nx\">CounterProvider<\/span> <span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<h3>3. \u4f7f\u7528useContext\u7684\u7ec4\u4ef6<\/h3>\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\">useContext<\/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<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">CounterContextType<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">..\/..\/types\/counter<\/span><span class=\"dl\">\"<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">CounterContext<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">.\/CounterContext<\/span><span class=\"dl\">\"<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">CounterControls<\/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=\"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\">useContext<\/span><span class=\"p\">(<\/span><span class=\"nx\">CounterContext<\/span><span class=\"p\">)<\/span> <span class=\"k\">as<\/span> <span class=\"nx\">CounterContextType<\/span><span class=\"p\">;<\/span>\r\n\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">increment<\/span> <span class=\"o\">=<\/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>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">decrement<\/span> <span class=\"o\">=<\/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>\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\">increment<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>Increment<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\">button<\/span> <span class=\"na\">onClick<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">decrement<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>Decrement<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\">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\">CounterControls<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<h3>4. \u7528\u7ec4\u4ef6\u6765\u8868\u793a<\/h3>\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\">useContext<\/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<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">CounterContext<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">.\/CounterContext<\/span><span class=\"dl\">\"<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">CounterContextType<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">..\/..\/types\/counter<\/span><span class=\"dl\">\"<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">CounterDisplay<\/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=\"p\">{<\/span> <span class=\"nx\">count<\/span> <span class=\"p\">}<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useContext<\/span><span class=\"p\">(<\/span><span class=\"nx\">CounterContext<\/span><span class=\"p\">)<\/span> <span class=\"k\">as<\/span> <span class=\"nx\">CounterContextType<\/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\">p<\/span><span class=\"p\">&gt;<\/span>Count: <span class=\"si\">{<\/span><span class=\"nx\">count<\/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\r\n<span class=\"k\">export<\/span> <span class=\"k\">default<\/span> <span class=\"nx\">CounterDisplay<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<h3>\u4f7f\u7528\u7531App\u7ec4\u4ef6\u63d0\u4f9b\u7684\u4e0a\u4e0b\u6587<\/h3>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"nx\">React<\/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<span class=\"k\">import<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">.\/App.css<\/span><span class=\"dl\">\"<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">CounterProvider<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">.\/components\/CounterContext\/CounterContext<\/span><span class=\"dl\">\"<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"nx\">CounterControls<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">.\/components\/CounterContext\/CounterControls<\/span><span class=\"dl\">\"<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"nx\">CounterDisplay<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">.\/components\/CounterContext\/CounterDisplay<\/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=\"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=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"nt\">div<\/span> <span class=\"na\">className<\/span><span class=\"p\">=<\/span><span class=\"s\">\"App\"<\/span><span class=\"p\">&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">CounterProvider<\/span><span class=\"p\">&gt;<\/span>\r\n        <span class=\"p\">&lt;<\/span><span class=\"nc\">CounterDisplay<\/span> <span class=\"p\">\/&gt;<\/span>\r\n        <span class=\"p\">&lt;<\/span><span class=\"nc\">CounterControls<\/span> <span class=\"p\">\/&gt;<\/span>\r\n      <span class=\"p\">&lt;\/<\/span><span class=\"nc\">CounterProvider<\/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=\"k\">export<\/span> <span class=\"k\">default<\/span> <span class=\"nx\">App<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d31aa37434c4406c5fb4e\/12-0.png\" alt=\"image.png\" \/><\/div>\n<h2>\u603b\u7ed3<\/h2>\n<p>useContext\u662fReact\u5e94\u7528\u7a0b\u5e8f\u5f00\u53d1\u4e2d\u975e\u5e38\u5f3a\u5927\u7684\u5de5\u5177\u3002\u901a\u8fc7\u4f7f\u7528useContext\u5728\u7ec4\u4ef6\u4e4b\u95f4\u5171\u4eab\u72b6\u6001\uff0c\u53ef\u4ee5\u63d0\u9ad8\u5e94\u7528\u7a0b\u5e8f\u7684\u53ef\u7ef4\u62a4\u6027\u548c\u53ef\u8bfb\u6027\u3002\u6211\u4eec\u53ef\u4ee5\u719f\u7ec3\u5730\u4f7f\u7528\u5404\u79cdHooks\u6765\u6784\u5efa\u66f4\u9ad8\u6548\u548c\u6613\u4e8e\u4f7f\u7528\u7684React\u5e94\u7528\u7a0b\u5e8f\u3002<\/p>\n<p>\u672c\u6587\u662f\u4e3a\u521d\u5b66\u8005\u5927\u5b66\u751f\u63d0\u4f9b\u4e86\u89e3React Next\u7684\u8f93\u51fa\u8d44\u6599\u3002\u5982\u679c\u6709\u9519\u8bef\u6216\u610f\u89c1\uff0c\u8bf7\u7559\u8a00\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>useContext\u7684\u4f7f\u7528\u65b9\u6cd5 useContext\u662f\u7528\u4e8e\u901a\u8fc7React\u4e0a\u4e0b\u6587\u5171\u4eab\u5168\u5c40\u72b6\u6001\u7684\u5de5\u5177\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528u [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-37984","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>\u3010\u54cd\u5e94\u3011\u5c1d\u8bd5\u4f7f\u7528useContext - 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\/\u3010\u54cd\u5e94\u3011\u5c1d\u8bd5\u4f7f\u7528usecontext\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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