{"id":38166,"date":"2023-03-02T14:35:47","date_gmt":"2024-01-11T19:46:12","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/react-context%e6%98%af%e4%bb%80%e4%b9%88%ef%bc%9f\/"},"modified":"2024-04-29T17:04:53","modified_gmt":"2024-04-29T09:04:53","slug":"react-context%e6%98%af%e4%bb%80%e4%b9%88%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/react-context%e6%98%af%e4%bb%80%e4%b9%88%ef%bc%9f\/","title":{"rendered":"React.context\u662f\u4ec0\u4e48\uff1f"},"content":{"rendered":"<h2>\u300ccontext\u300d\u3068\u306f\u4ec0\u4e48\u610f\u601d\uff1f<\/h2>\n<h2>\u6d41\u7a0b\u7684\u80cc\u666f<\/h2>\n<p>&nbsp;<\/p>\n<h2>\u8fd9\u662f\u4e00\u4e2a\u5173\u4e8e\u4e0a\u4e0b\u6587\u7684\u4f8b\u5b50\u3002<\/h2>\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=\"s1\">react<\/span><span class=\"dl\">'<\/span>\r\n\r\n<span class=\"k\">export<\/span> <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=\"s1\">#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=\"s1\">#eeeeee<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/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=\"s1\">#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=\"s1\">#222222<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"p\">},<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">export<\/span> <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\">dark<\/span><span class=\"p\">);<\/span>\r\n<\/code><\/pre>\n<p>\u4f7f\u7528React.createContext()\u6765\u5b9a\u4e49\u8981\u5171\u4eab\u7684\u6570\u636e\u3002<br \/>\n\u8fd9\u5c06\u88ab\u5b9a\u4e49\u4e3a\u4ee5themes.dark\u4e3a\u9ed8\u8ba4\u503c\u4f7f\u7528\u3002<br \/>\ndefaultValue\u662f\u5728\u67d0\u4e2a\u7ec4\u4ef6\u65e0\u6cd5\u627e\u5230Provider\uff08\u7236\u5b50\u5173\u7cfb\u274c\uff09\u65f6\u4f7f\u7528\u7684\u503c\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\">Component<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">react<\/span><span class=\"dl\">'<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">ThemeContext<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">.\/ThemeContext<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"kd\">class<\/span> <span class=\"nc\">ThemedButton<\/span> <span class=\"kd\">extends<\/span> <span class=\"nc\">Component<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"nf\">render<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n      <span class=\"kd\">let<\/span> <span class=\"nx\">props<\/span> <span class=\"o\">=<\/span> <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">props<\/span><span class=\"p\">;<\/span>\r\n      <span class=\"kd\">let<\/span> <span class=\"nx\">theme<\/span> <span class=\"o\">=<\/span> <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">context<\/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> \r\n        <span class=\"si\">{<\/span><span class=\"p\">...<\/span><span class=\"nx\">props<\/span><span class=\"si\">}<\/span> \r\n        <span class=\"na\">onClick<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">props<\/span><span class=\"p\">.<\/span><span class=\"nx\">changeTheme<\/span><span class=\"si\">}<\/span>\r\n        <span class=\"na\">style<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"p\">{<\/span> <span class=\"na\">backgroundColor<\/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            button1\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  <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<span class=\"nx\">ThemedButton<\/span><span class=\"p\">.<\/span><span class=\"nx\">contextType<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">ThemeContext<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">export<\/span> <span class=\"k\">default<\/span> <span class=\"nx\">ThemedButton<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<p>\u4f60\u53ef\u4ee5\u5c06\u4f7f\u7528React.createContext()\u521b\u5efa\u7684\u4e0a\u4e0b\u6587\u5bf9\u8c61\uff08ThemeContext\uff09\u6307\u5b9a\u7ed9\u9700\u8981\u7684\u7c7b\u7684contextType\u5c5e\u6027\u3002<br \/>\n\u901a\u8fc7\u4f7f\u7528\u8fd9\u4e2a\u5c5e\u6027\uff0c\u5728\u7c7b\u5185\u90e8\u53ef\u4ee5\u4f7f\u7528this.context\u6765\u67e5\u627e\u5e76\u8bfb\u53d6\u6700\u8fd1\u7684Provider\u4e2d\u7684\u503c\uff0c\u4ee5\u4fbf\u5b9e\u73b0\u76f8\u5e94\u4e0a\u4e0b\u6587\u7684\u529f\u80fd\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\">Component<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">react<\/span><span class=\"dl\">'<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">ThemeContext<\/span><span class=\"p\">,<\/span> <span class=\"nx\">themes<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">.\/ThemeContext<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"nx\">ThemedButton<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">.\/ThemedButton<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"k\">default<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Example<\/span> <span class=\"kd\">extends<\/span> <span class=\"nc\">Component<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nf\">constructor<\/span><span class=\"p\">(<\/span><span class=\"nx\">props<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"k\">super<\/span><span class=\"p\">(<\/span><span class=\"nx\">props<\/span><span class=\"p\">);<\/span>\r\n        <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">state<\/span> <span class=\"o\">=<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"na\">theme<\/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        <span class=\"p\">};<\/span>\r\n        <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">toggleTheme<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nf\">setState<\/span><span class=\"p\">((<\/span><span class=\"nx\">prev<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">({<\/span>\r\n                <span class=\"na\">theme<\/span><span class=\"p\">:<\/span> <span class=\"nx\">prev<\/span><span class=\"p\">.<\/span><span class=\"nx\">theme<\/span> <span class=\"o\">===<\/span> <span class=\"nx\">themes<\/span><span class=\"p\">.<\/span><span class=\"nx\">dark<\/span> <span class=\"p\">?<\/span> <span class=\"nx\">themes<\/span><span class=\"p\">.<\/span><span class=\"nx\">light<\/span> <span class=\"p\">:<\/span> <span class=\"nx\">themes<\/span><span class=\"p\">.<\/span><span class=\"nx\">dark<\/span><span class=\"p\">,<\/span>\r\n            <span class=\"p\">}));<\/span>\r\n         <span class=\"p\">};<\/span>\r\n    <span class=\"p\">}<\/span>\r\n  <span class=\"nf\">render<\/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\">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=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">state<\/span><span class=\"p\">.<\/span><span class=\"nx\">theme<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>\r\n              <span class=\"p\">&lt;<\/span><span class=\"nc\">ThemedButton<\/span> <span class=\"na\">changeTheme<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">toggleTheme<\/span><span class=\"si\">}<\/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\">Consumer<\/span><span class=\"p\">&gt;<\/span>\r\n                  <span class=\"si\">{<\/span><span class=\"p\">(<\/span><span class=\"nx\">theme<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">(<\/span>\r\n                        <span class=\"p\">&lt;<\/span><span class=\"nt\">div<\/span> \r\n                            <span class=\"na\">style<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"p\">{<\/span>\r\n                                <span class=\"na\">height<\/span><span class=\"p\">:<\/span> <span class=\"mi\">300<\/span><span class=\"p\">,<\/span> \r\n                                    <span class=\"na\">width<\/span><span class=\"p\">:<\/span><span class=\"mi\">300<\/span><span class=\"p\">,<\/span> \r\n                                    <span class=\"na\">backgroundColor<\/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=\"si\">}<\/span>\r\n                                    <span class=\"p\">&gt;&lt;\/<\/span><span class=\"nt\">div<\/span><span class=\"p\">&gt;<\/span>\r\n                                <span class=\"p\">)<\/span><span class=\"si\">}<\/span>\r\n              <span class=\"p\">&lt;\/<\/span><span class=\"nc\">ThemeContext<\/span><span class=\"p\">.<\/span><span class=\"nc\">Consumer<\/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\">&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<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u88ab\u5305\u88f9\u5728\u5176\u4e2d<br \/>\n\u7684backgroundColor\u7531Provider\u7684value prop\u786e\u5b9a\uff0c\u5b83\u5c06\u88ab\u8bbe\u7f6e\u4e3a\u201clight\u201d\u3002Provider\u4f1a\u5c06\u8fd9\u4e2a\u503c\u4f20\u9012\u7ed9\u4e0b\u5c42\u7684\u7ec4\u4ef6\u3002\u5f53\u70b9\u51fb\u4e0b\u5c42\u7684ThemedButton\u65f6\uff0c\u901a\u8fc7toggleTheme\u65b9\u6cd5\uff0cbackgroundColor\u4f1a\u6539\u53d8\u3002<br \/>\n\u7684theme\u53c2\u6570\u4e0e\u5b83\u6240\u5728\u7684\u4e0a\u5c42\u6700\u8fd1\u7684Provider\u7684value prop\u76f8\u540c\u3002\u56e0\u6b64\uff0c\u548c\u7684backgroundColor\u662f\u5171\u4eab\u7684\uff0c\u59cb\u7ec8\u4fdd\u6301\u4e00\u81f4\u3002<br \/>\n\u6700\u5e95\u90e8\u7684\u6ca1\u6709\u88ab\u6240\u5305\u88f9\uff0c\u56e0\u6b64\u6839\u636eThemeContext.js\u4e2d\u7684\u903b\u8f91\uff0c\u5b83\u7684backgroundColor\u59cb\u7ec8\u662fdark\u3002<br \/>\nexport const ThemeContext = React.createContext(themes.dark);<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d32a937434c4406c62dec\/12-0.png\" alt=\"image.png\" \/><\/div>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d32a937434c4406c62dec\/13-0.png\" alt=\"image.png\" \/><\/div>\n<h2>\u4f7f\u7528 useContext \u94a9\u5b50<\/h2>\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=\"s1\">react<\/span><span class=\"dl\">'<\/span>\r\n<span class=\"k\">import<\/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=\"s1\">react<\/span><span class=\"dl\">'<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">ThemeContext<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">.\/ThemeContext<\/span><span class=\"dl\">'<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"k\">default<\/span> <span class=\"kd\">function<\/span> <span class=\"nf\">ThemedButton<\/span><span class=\"p\">(<\/span><span class=\"nx\">props<\/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> \r\n        <span class=\"si\">{<\/span><span class=\"p\">...<\/span><span class=\"nx\">props<\/span><span class=\"si\">}<\/span> \r\n        <span class=\"na\">onClick<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">props<\/span><span class=\"p\">.<\/span><span class=\"nx\">changeTheme<\/span><span class=\"si\">}<\/span>\r\n        <span class=\"na\">style<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"p\">{<\/span> <span class=\"na\">backgroundColor<\/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            button1\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<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u300ccontext\u300d\u3068\u306f\u4ec0\u4e48\u610f\u601d\uff1f \u6d41\u7a0b\u7684\u80cc\u666f &nbsp; \u8fd9\u662f\u4e00\u4e2a\u5173\u4e8e\u4e0a\u4e0b\u6587\u7684\u4f8b\u5b50\u3002 import Reac [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-38166","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>React.context\u662f\u4ec0\u4e48\uff1f - 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\/react-context\u662f\u4ec0\u4e48\uff1f\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"React.context\u662f\u4ec0\u4e48\uff1f\" \/>\n<meta property=\"og:description\" content=\"\u300ccontext\u300d\u3068\u306f\u4ec0\u4e48\u610f\u601d\uff1f \u6d41\u7a0b\u7684\u80cc\u666f &nbsp; \u8fd9\u662f\u4e00\u4e2a\u5173\u4e8e\u4e0a\u4e0b\u6587\u7684\u4f8b\u5b50\u3002 import Reac [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/react-context\u662f\u4ec0\u4e48\uff1f\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2024-01-11T19:46:12+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-04-29T09:04:53+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d32a937434c4406c62dec\/12-0.png\" \/>\n<meta name=\"author\" content=\"\u96c5, \u609f\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" 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