{"id":91724,"date":"2026-08-08T10:56:43","date_gmt":"2026-08-08T02:56:43","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/91724.html"},"modified":"2026-08-08T10:56:43","modified_gmt":"2026-08-08T02:56:43","slug":"%e6%b7%b1%e5%85%a5%e7%90%86%e8%a7%a3-react-usecontext%ef%bc%9a%e8%b7%a8%e5%b1%82%e7%ba%a7%e7%bb%84%e4%bb%b6%e9%80%9a%e4%bf%a1%e7%9a%84%e6%a0%b8%e5%bf%83%e5%88%a9%e5%99%a8","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/91724.html","title":{"rendered":"\u6df1\u5165\u7406\u89e3 React useContext\uff1a\u8de8\u5c42\u7ea7\u7ec4\u4ef6\u901a\u4fe1\u7684\u6838\u5fc3\u5229\u5668"},"content":{"rendered":"<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>\n<ul>\n<li>\u4e00\u3001\u524d\u8a00&#xff1a;\u4ec0\u4e48\u662f&#034;\u4e0a\u4e0b\u6587&#034;&#xff1f;<\/li>\n<li>\u4e8c\u3001\u7ec4\u4ef6\u901a\u4fe1\u7684\u56db\u79cd\u5173\u7cfb<\/li>\n<li>\u4e09\u3001\u5f53\u7ec4\u4ef6\u5c42\u6b21\u5f88\u6df1\u65f6\u2014\u2014useContext \u767b\u573a<\/li>\n<li>\n<ul>\n<li>3.1 \u5b83\u89e3\u51b3\u4e86\u4ec0\u4e48\u95ee\u9898&#xff1f;<\/li>\n<li>3.2 \u6838\u5fc3\u89d2\u8272&#xff1a;Provider \u4e0e Consumer<\/li>\n<\/ul>\n<\/li>\n<li>\u56db\u3001useContext \u4e09\u6b65\u8d70&#xff08;\u5b9e\u6218\u5b8c\u6574\u4ee3\u7801&#xff09;<\/li>\n<li>\n<ul>\n<li>\u7b2c\u4e00\u6b65&#xff1a;createContext \u521b\u5efa\u4e0a\u4e0b\u6587<\/li>\n<li>\u7b2c\u4e8c\u6b65&#xff1a;Provider \u5305\u88f9\u7ec4\u4ef6\u6811<\/li>\n<li>\u7b2c\u4e09\u6b65&#xff1a;useContext \u6d88\u8d39\u4e0a\u4e0b\u6587<\/li>\n<\/ul>\n<\/li>\n<li>\u4e94\u3001\u81ea\u5b9a\u4e49 Hooks&#xff1a;\u628a\u4e0a\u4e0b\u6587\u6d88\u8d39\u5c01\u88c5\u8d77\u6765<\/li>\n<li>\n<ul>\n<li>5.1 \u4e3a\u4ec0\u4e48\u9700\u8981\u81ea\u5b9a\u4e49 Hook&#xff1f;<\/li>\n<li>5.2 \u5c01\u88c5 useTheme Hook<\/li>\n<li>5.3 \u81ea\u5b9a\u4e49 Hook \u7684\u672c\u8d28<\/li>\n<\/ul>\n<\/li>\n<li>\u516d\u3001\u7efc\u5408\u5b9e\u6218&#xff1a;\u76d1\u542c\u9f20\u6807\u79fb\u52a8&#xff0c;\u5750\u6807\u5b9e\u65f6\u663e\u793a<\/li>\n<li>\n<ul>\n<li>6.1 \u9700\u6c42\u5206\u6790<\/li>\n<li>6.2 \u5b8c\u6574\u4ee3\u7801\u5b9e\u73b0<\/li>\n<li>6.3 \u5728\u7ec4\u4ef6\u4e2d\u4f7f\u7528<\/li>\n<li>6.4 \u4ee3\u7801\u6267\u884c\u6d41\u7a0b\u89e3\u6790<\/li>\n<li>6.5 \u548c Context \u7684\u5173\u7cfb<\/li>\n<\/ul>\n<\/li>\n<li>\u4e03\u3001\u5168\u6587\u603b\u7ed3<\/li>\n<li>\n<ul>\n<li>7.1 \u77e5\u8bc6\u8def\u5f84\u56de\u987e<\/li>\n<li>7.2 \u6838\u5fc3\u77e5\u8bc6\u70b9\u590d\u76d8<\/li>\n<li>7.3 \u5e38\u89c1\u95ee\u9898 \/ \u907f\u5751\u6307\u5357<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr \/>\n<h3>\u4e00\u3001\u524d\u8a00&#xff1a;\u4ec0\u4e48\u662f&#034;\u4e0a\u4e0b\u6587&#034;&#xff1f;<\/h3>\n<p>\u5728 React \u5f00\u53d1\u4e2d&#xff0c;\u201c\u4e0a\u4e0b\u6587\u201d&#xff08;Context&#xff09;\u8fd9\u4e2a\u8bcd\u5e76\u4e0d\u964c\u751f\u3002\u4f60\u53ef\u4ee5\u628a\u5b83\u60f3\u8c61\u6210\u4e00\u9897\u7ec4\u4ef6\u6811\u7684&#034;\u5168\u5c40\u5e7f\u64ad\u7ad9&#034;\u2014\u2014\u67d0\u4e2a\u7ec4\u4ef6\u5728\u4e0a\u9762&#034;\u558a\u4e00\u58f0&#034;&#xff08;\u63d0\u4f9b\u6570\u636e&#xff09;&#xff0c;\u6811\u4e2d\u4efb\u610f\u6df1\u5ea6\u7684\u5b50\u7ec4\u4ef6\u90fd\u80fd&#034;\u542c\u5230&#034;&#xff08;\u6d88\u8d39\u6570\u636e&#xff09;&#xff0c;\u800c\u4e0d\u9700\u8981\u4e2d\u95f4\u6bcf\u4e00\u5c42\u7ec4\u4ef6\u5e2e\u5fd9\u4f20\u8bdd\u3002<\/p>\n<p>\u4f46\u5728\u7406\u89e3 Context \u4e4b\u524d&#xff0c;\u6211\u4eec\u6709\u5fc5\u8981\u5148\u56de\u987e\u4e00\u4e0b React \u4e2d\u7ec4\u4ef6\u901a\u4fe1\u7684\u5404\u79cd\u573a\u666f&#xff0c;\u8fd9\u6837\u624d\u80fd\u771f\u6b63\u660e\u767d \u4e3a\u4ec0\u4e48\u9700\u8981 useContext\u3002<\/p>\n<hr \/>\n<h3>\u4e8c\u3001\u7ec4\u4ef6\u901a\u4fe1\u7684\u56db\u79cd\u5173\u7cfb<\/h3>\n<p>React \u5e94\u7528\u7531\u7ec4\u4ef6\u6784\u6210&#xff0c;\u7ec4\u4ef6\u4e4b\u95f4\u5fc5\u7136\u8981\u4f20\u9012\u6570\u636e\u3002\u6839\u636e\u7ec4\u4ef6\u4e4b\u95f4\u7684\u5c42\u7ea7\u5173\u7cfb&#xff0c;\u901a\u4fe1\u65b9\u5f0f\u53ef\u4ee5\u5f52\u7eb3\u4e3a\u4ee5\u4e0b\u56db\u79cd\u3002<\/p>\n<p>1 \u7236\u5b50\u7ec4\u4ef6\u901a\u4fe1<\/p>\n<p>\u8fd9\u662f React \u4e2d\u6700\u57fa\u7840\u3001\u6700\u5e38\u89c1\u7684\u901a\u4fe1\u65b9\u5f0f&#xff0c;\u6838\u5fc3\u662f\u5355\u5411\u6570\u636e\u6d41&#xff1a;<\/p>\n<p>\u6570\u636e\u4ece\u7236\u7ec4\u4ef6\u6d41\u5411\u5b50\u7ec4\u4ef6&#xff0c;\u901a\u8fc7 props \u4f20\u9012\u3002<br \/>\n\u5b50\u7ec4\u4ef6\u4e0d\u80fd\u76f4\u63a5\u4fee\u6539\u7236\u7ec4\u4ef6\u7684\u6570\u636e&#xff0c;\u800c\u662f\u901a\u8fc7\u7236\u7ec4\u4ef6\u4f20\u9012\u7684\u56de\u8c03\u51fd\u6570\u6765\u901a\u77e5\u7236\u7ec4\u4ef6\u3002<\/p>\n<p>\u4ee3\u7801\u793a\u4f8b&#xff1a;\u7236\u4f20\u5b50 &#043; \u5b50\u901a\u77e5\u7236<\/p>\n<p><span class=\"token comment\">\/\/ \u7236\u7ec4\u4ef6<\/span><br \/>\n<span class=\"token keyword\">function<\/span> <span class=\"token function\">Parent<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">const<\/span> <span class=\"token punctuation\">[<\/span>count<span class=\"token punctuation\">,<\/span> setCount<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">useState<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>  <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token operator\">&lt;<\/span>div<span class=\"token operator\">&gt;<\/span><br \/>\n      <span class=\"token operator\">&lt;<\/span>h2<span class=\"token operator\">&gt;<\/span>\u7236\u7ec4\u4ef6 \u2014\u2014 \u5f53\u524d\u8ba1\u6570&#xff1a;<span class=\"token punctuation\">{<\/span>count<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>h2<span class=\"token operator\">&gt;<\/span><br \/>\n      <span class=\"token punctuation\">{<\/span><span class=\"token comment\">\/* \u2460 \u901a\u8fc7 props \u628a\u6570\u636e\u4f20\u7ed9\u5b50\u7ec4\u4ef6 *\/<\/span><span class=\"token punctuation\">}<\/span><br \/>\n      <span class=\"token punctuation\">{<\/span><span class=\"token comment\">\/* \u2461 \u540c\u65f6\u628a\u4fee\u6539\u6570\u636e\u7684\u65b9\u6cd5\u4e5f\u4f20\u7ed9\u5b50\u7ec4\u4ef6 *\/<\/span><span class=\"token punctuation\">}<\/span><br \/>\n      <span class=\"token operator\">&lt;<\/span>Child count<span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">{<\/span>count<span class=\"token punctuation\">}<\/span> onIncrement<span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token function\">setCount<\/span><span class=\"token punctuation\">(<\/span>count <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">}<\/span> <span class=\"token operator\">\/<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n    <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>div<span class=\"token operator\">&gt;<\/span><br \/>\n  <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5b50\u7ec4\u4ef6<\/span><br \/>\n<span class=\"token keyword\">function<\/span> <span class=\"token function\">Child<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\"><span class=\"token punctuation\">{<\/span> count<span class=\"token punctuation\">,<\/span> onIncrement <span class=\"token punctuation\">}<\/span><\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token operator\">&lt;<\/span>div<span class=\"token operator\">&gt;<\/span><br \/>\n      <span class=\"token operator\">&lt;<\/span>p<span class=\"token operator\">&gt;<\/span>\u5b50\u7ec4\u4ef6\u63a5\u6536\u5230&#xff1a;<span class=\"token punctuation\">{<\/span>count<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>p<span class=\"token operator\">&gt;<\/span><br \/>\n      <span class=\"token punctuation\">{<\/span><span class=\"token comment\">\/* \u70b9\u51fb\u65f6\u8c03\u7528\u7236\u7ec4\u4ef6\u4f20\u4e0b\u6765\u7684\u56de\u8c03 *\/<\/span><span class=\"token punctuation\">}<\/span><br \/>\n      <span class=\"token operator\">&lt;<\/span>button onClick<span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">{<\/span>onIncrement<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&#043;<\/span><span class=\"token number\">1<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>button<span class=\"token operator\">&gt;<\/span><br \/>\n    <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>div<span class=\"token operator\">&gt;<\/span><br \/>\n  <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u89e3\u6790&#xff1a;\u7236\u7ec4\u4ef6\u901a\u8fc7 props \u5411\u4e0b\u4f20\u9012 count \u6570\u636e&#xff0c;\u540c\u65f6\u628a onIncrement \u56de\u8c03\u51fd\u6570\u4e00\u5e76\u4f20\u4e0b\u53bb&#xff0c;\u5b50\u7ec4\u4ef6\u70b9\u51fb\u6309\u94ae\u65f6\u8c03\u7528\u8fd9\u4e2a\u56de\u8c03&#xff0c;\u7236\u7ec4\u4ef6\u66f4\u65b0 state&#xff0c;React \u81ea\u52a8\u91cd\u65b0\u6e32\u67d3\u3002\u8fd9\u5c31\u662f\u5178\u578b\u7684\u5355\u5411\u6570\u636e\u6d41 &#043; \u72b6\u6001\u63d0\u5347\u6a21\u5f0f\u3002<\/p>\n<p>\u8fd9\u79cd\u6a21\u5f0f\u7684\u4f18\u70b9\u5728\u4e8e&#xff1a;\u6570\u636e\u6d41\u5411\u6e05\u6670\u3001\u6613\u4e8e\u8ffd\u8e2a\u8c03\u8bd5&#xff0c;\u9002\u5408\u7edd\u5927\u591a\u6570\u7b80\u5355\u573a\u666f\u3002<\/p>\n<p>\u5144\u5f1f\u7ec4\u4ef6\u901a\u4fe1<\/p>\n<p>\u4e24\u4e2a\u7ec4\u4ef6\u6709\u540c\u4e00\u4e2a\u7236\u7ec4\u4ef6&#xff0c;\u5b83\u4eec\u4e4b\u95f4\u9700\u8981\u5171\u4eab\u6570\u636e\u65f6&#xff0c;\u505a\u6cd5\u662f\u628a\u5171\u4eab\u72b6\u6001\u63d0\u5347\u5230\u5b83\u4eec\u5171\u540c\u7684\u7236\u7ec4\u4ef6\u4e2d<\/p>\n<p>\u5144\u5f1f\u7ec4\u4ef6\u4e4b\u95f4\u4e0d\u76f4\u63a5\u901a\u4fe1&#xff0c;\u800c\u662f\u901a\u8fc7&#034;\u6700\u8fd1\u5171\u540c\u7956\u5148&#034;\u4f5c\u4e3a\u4e2d\u8f6c\u7ad9\u3002\u8fd9\u548c\u7236\u5b50\u901a\u4fe1\u672c\u8d28\u4e0a\u662f\u4e00\u79cd\u6a21\u5f0f\u3002<\/p>\n<p>\u7237\u5b59 \/ \u8de8\u5c42\u7ea7\u7ec4\u4ef6\u901a\u4fe1<\/p>\n<p>\u8fd9\u662f\u95ee\u9898\u5f00\u59cb\u66b4\u9732\u7684\u5730\u65b9\u3002\u5047\u8bbe\u7ec4\u4ef6\u5c42\u7ea7\u5982\u4e0b&#xff1a;<\/p>\n<p>\u7237\u7237&#xff08;GrandParent&#xff09;<br \/>\n \u2514\u2500\u2500 \u7238\u7238&#xff08;Parent&#xff09;<br \/>\n      \u2514\u2500\u2500 \u513f\u5b50&#xff08;Child&#xff09;<br \/>\n           \u2514\u2500\u2500 \u5b59\u5b50&#xff08;GrandChild&#xff09;<\/p>\n<p>\u5982\u679c\u7237\u7237\u7ec4\u4ef6\u7684\u6570\u636e\u8981\u4f20\u7ed9\u5b59\u5b50&#xff0c;\u7528 props \u5c31\u5f97\u8fd9\u6837\u5199&#xff1a;<\/p>\n<p><span class=\"token keyword\">function<\/span> <span class=\"token function\">GrandParent<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">const<\/span> <span class=\"token punctuation\">[<\/span>theme<span class=\"token punctuation\">,<\/span> setTheme<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">useState<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;dark&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&lt;<\/span>Parent theme<span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">{<\/span>theme<span class=\"token punctuation\">}<\/span> <span class=\"token operator\">\/<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">function<\/span> <span class=\"token function\">Parent<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\"><span class=\"token punctuation\">{<\/span> theme <span class=\"token punctuation\">}<\/span><\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token comment\">\/\/ \u8fd9\u5c42\u6839\u672c\u4e0d\u5173\u5fc3 theme&#xff0c;\u7eaf\u7cb9\u5f53&#034;\u642c\u8fd0\u5de5&#034;<\/span><br \/>\n  <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&lt;<\/span>Child theme<span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">{<\/span>theme<span class=\"token punctuation\">}<\/span> <span class=\"token operator\">\/<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">function<\/span> <span class=\"token function\">Child<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\"><span class=\"token punctuation\">{<\/span> theme <span class=\"token punctuation\">}<\/span><\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token comment\">\/\/ \u7ee7\u7eed\u642c\u8fd0&#8230;<\/span><br \/>\n  <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&lt;<\/span>GrandChild theme<span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">{<\/span>theme<span class=\"token punctuation\">}<\/span> <span class=\"token operator\">\/<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">function<\/span> <span class=\"token function\">GrandChild<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\"><span class=\"token punctuation\">{<\/span> theme <span class=\"token punctuation\">}<\/span><\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token comment\">\/\/ \u7ec8\u4e8e\u7528\u5230 theme \u4e86&#xff01;<\/span><br \/>\n  <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&lt;<\/span>div<span class=\"token operator\">&gt;<\/span>\u5f53\u524d\u4e3b\u9898&#xff1a;<span class=\"token punctuation\">{<\/span>theme<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>div<span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd9\u5c31\u662f\u7ecf\u5178\u7684&#034;Props \u900f\u4f20&#034;&#xff08;Prop Drilling&#xff09;\u95ee\u9898&#xff1a;\u4e2d\u95f4\u7ec4\u4ef6\u88ab\u8feb\u63a5\u6536\u5e76\u8f6c\u53d1\u81ea\u5df1\u6839\u672c\u4e0d\u9700\u8981\u7684 props&#xff0c;\u5c42\u6b21\u8d8a\u6df1&#xff0c;\u642c\u8fd0\u5de5\u4f5c\u5c31\u8d8a\u7e41\u7410\u3001\u8d8a\u5bb9\u6613\u51fa\u9519\u3002\u4e00\u4e2a\u4e2d\u95f4\u7ec4\u4ef6\u6539\u52a8\u4e86 props \u540d\u79f0&#xff0c;\u6574\u4e2a\u94fe\u6761\u90fd\u8981\u8ddf\u7740\u6539\u3002<\/p>\n<p>\u964c\u751f\u4eba\u7ec4\u4ef6\u901a\u4fe1<\/p>\n<p>\u4e24\u4e2a\u7ec4\u4ef6\u5728\u7ec4\u4ef6\u6811\u4e2d\u6beb\u65e0\u5173\u7cfb&#xff08;\u4e0d\u540c\u7684\u9875\u9762\u3001\u4e0d\u540c\u7684\u8def\u7531\u5206\u652f&#xff09;&#xff0c;\u5b83\u4eec\u4e4b\u95f4\u7684\u6570\u636e\u5171\u4eab\u5c31\u9700\u8981\u501f\u52a9\u5168\u5c40\u72b6\u6001\u7ba1\u7406\u65b9\u6848&#xff08;\u5982 Redux\u3001Zustand&#xff09;\u6216 React Context \u6765\u5b9e\u73b0\u3002\u5bf9\u4e8e&#034;\u4e0d\u5f15\u5165\u7b2c\u4e09\u65b9\u5e93&#xff0c;\u53c8\u60f3\u5168\u5c40\u5171\u4eab\u6570\u636e&#034;\u7684\u573a\u666f&#xff0c;Context \u5c31\u662f React \u63d0\u4f9b\u7684\u539f\u751f\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n<hr \/>\n<h3>\u4e09\u3001\u5f53\u7ec4\u4ef6\u5c42\u6b21\u5f88\u6df1\u65f6\u2014\u2014useContext \u767b\u573a<\/h3>\n<h4>3.1 \u5b83\u89e3\u51b3\u4e86\u4ec0\u4e48\u95ee\u9898&#xff1f;<\/h4>\n<p>\u4e0a\u9762\u63d0\u5230\u7684 Props \u900f\u4f20\u95ee\u9898&#xff0c;\u968f\u7740\u9879\u76ee\u53d8\u5927&#xff0c;\u7ec4\u4ef6\u5c42\u7ea7\u8d8a\u6765\u8d8a\u6df1&#xff0c;\u201c\u642c\u8fd0 props\u201d \u4f1a\u53d8\u6210\u4e00\u79cd\u6298\u78e8&#xff1a;<\/p>\n<ul>\n<li>\u4e2d\u95f4\u7ec4\u4ef6\u88ab\u8feb\u63a5\u6536\u65e0\u5173 props&#xff0c;\u4ee3\u7801\u53d8\u5f97\u81c3\u80bf<\/li>\n<li>\u9700\u6c42\u53d8\u66f4\u65f6&#xff08;\u6bd4\u5982\u8981\u52a0\u4e00\u4e2a\u65b0 prop&#xff09;&#xff0c;\u6bcf\u4e00\u5c42\u4e2d\u95f4\u7ec4\u4ef6\u90fd\u5f97\u6539<\/li>\n<li>\u7ec4\u4ef6\u590d\u7528\u6027\u53d8\u5dee\u2014\u2014\u4e2d\u95f4\u7ec4\u4ef6\u548c\u7279\u5b9a props \u5f3a\u8026\u5408<\/li>\n<\/ul>\n<p>useContext \u7684\u601d\u8def\u5f88\u7b80\u5355&#xff1a;\u5f00\u4e00\u4e2a&#034;\u8de8\u5c42\u7ea7\u7684\u6570\u636e\u901a\u9053&#034;&#xff0c;\u8ba9\u6570\u636e\u63d0\u4f9b\u8005\u548c\u6570\u636e\u6d88\u8d39\u8005\u76f4\u63a5\u5bf9\u8bdd&#xff0c;\u4e2d\u95f4\u7ec4\u4ef6\u5b8c\u5168\u4e0d\u9700\u8981\u53c2\u4e0e\u3002<\/p>\n<h4>3.2 \u6838\u5fc3\u89d2\u8272&#xff1a;Provider \u4e0e Consumer<\/h4>\n<p>Context \u673a\u5236\u4e2d\u6709\u4e24\u4e2a\u5173\u952e\u89d2\u8272&#xff1a;<\/p>\n<table>\n<tr>\u89d2\u8272\u4f5c\u7528\u6bd4\u55bb<\/tr>\n<tbody>\n<tr>\n<td>Provider&#xff08;\u63d0\u4f9b\u8005&#xff09;<\/td>\n<td>\u5305\u88f9\u5728\u7ec4\u4ef6\u6811\u6700\u5916\u5c42&#xff0c;\u8d1f\u8d23&#034;\u5e7f\u64ad&#034;\u6570\u636e<\/td>\n<td>\u5e7f\u64ad\u7535\u53f0<\/td>\n<\/tr>\n<tr>\n<td>Consumer&#xff08;\u6d88\u8d39\u8005&#xff09;<\/td>\n<td>\u7ec4\u4ef6\u6811\u4e2d\u4efb\u610f\u6df1\u5ea6\u7684\u7ec4\u4ef6&#xff0c;\u8d1f\u8d23&#034;\u63a5\u6536&#034;\u6570\u636e<\/td>\n<td>\u6536\u97f3\u673a<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Provider \u53ea\u7ba1\u53d1&#xff0c;Consumer \u53ea\u7ba1\u6536&#xff0c;\u4e2d\u95f4\u9694\u4e86\u591a\u5c11\u5c42\u5b8c\u5168\u4e0d\u91cd\u8981\u3002<\/p>\n<hr \/>\n<h3>\u56db\u3001useContext \u4e09\u6b65\u8d70&#xff08;\u5b9e\u6218\u5b8c\u6574\u4ee3\u7801&#xff09;<\/h3>\n<p>\u4e0b\u9762\u901a\u8fc7\u4e00\u4e2a\u771f\u5b9e\u7684\u4e3b\u9898\u5207\u6362\u6848\u4f8b&#xff0c;\u6f14\u793a useContext \u7684\u5b8c\u6574\u7528\u6cd5\u3002\u4ee3\u7801\u6765\u81ea\u9879\u76ee\u5b9e\u6218&#xff0c;\u53ef\u76f4\u63a5\u8fd0\u884c\u3002<\/p>\n<h4>\u7b2c\u4e00\u6b65&#xff1a;createContext \u521b\u5efa\u4e0a\u4e0b\u6587<\/h4>\n<p><span class=\"token comment\">\/\/ ThemeContext.jsx<\/span><br \/>\n<span class=\"token comment\">\/\/ \u521b\u5efa\u4e00\u4e2a\u4e3b\u9898\u4e0a\u4e0b\u6587&#xff0c;\u4e3a\u6df1\u5c42\u6b21\u7684\u7ec4\u4ef6\u6811\u63d0\u4f9b\u4e3b\u9898\u5171\u4eab\u6570\u636e<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> createContext <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">from<\/span> <span class=\"token string\">&#039;react&#039;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ createContext(&#039;light&#039;) \u521b\u5efa\u4e00\u4e2a\u4e0a\u4e0b\u6587\u5bf9\u8c61<\/span><br \/>\n<span class=\"token comment\">\/\/ \u53c2\u6570 &#039;light&#039; \u662f\u9ed8\u8ba4\u503c \u2014\u2014 \u5f53\u7ec4\u4ef6\u6811\u4e2d\u6ca1\u6709 Provider \u65f6&#xff0c;\u5c31\u4f7f\u7528\u8fd9\u4e2a\u503c<\/span><br \/>\n<span class=\"token keyword\">export<\/span> <span class=\"token keyword\">const<\/span> ThemeContext <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">createContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;light&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5173\u952e\u89e3\u6790&#xff1a;<\/p>\n<ul>\n<li>createContext(defaultValue) \u63a5\u6536\u4e00\u4e2a\u9ed8\u8ba4\u503c\u4f5c\u4e3a\u53c2\u6570\u3002\u8fd9\u4e2a\u9ed8\u8ba4\u503c\u53ea\u6709\u5728\u7ec4\u4ef6\u6811\u4e2d\u627e\u4e0d\u5230\u5bf9\u5e94 Provider \u65f6\u624d\u4f1a\u751f\u6548\u3002<\/li>\n<li>\u8fd4\u56de\u7684\u662f\u4e00\u4e2a Context \u5bf9\u8c61&#xff0c;\u5b83\u8eab\u4e0a\u81ea\u5e26 Provider \u548c Consumer \u4e24\u4e2a\u5c5e\u6027\u3002<\/li>\n<li>\u901a\u5e38\u5c06 Context \u5bf9\u8c61\u5355\u72ec\u653e\u5728\u4e00\u4e2a\u6587\u4ef6\u4e2d&#xff0c;\u65b9\u4fbf\u591a\u5904\u5f15\u5165\u3002<\/li>\n<\/ul>\n<h4>\u7b2c\u4e8c\u6b65&#xff1a;Provider \u5305\u88f9\u7ec4\u4ef6\u6811<\/h4>\n<p><span class=\"token comment\">\/\/ App.jsx<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> useState <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">from<\/span> <span class=\"token string\">&#039;react&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> ThemeContext <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">from<\/span> <span class=\"token string\">&#039;.\/ThemeContext&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> Page <span class=\"token keyword\">from<\/span> <span class=\"token string\">&#039;.\/components\/Page&#039;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">function<\/span> <span class=\"token function\">App<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">const<\/span> <span class=\"token punctuation\">[<\/span>theme<span class=\"token punctuation\">,<\/span> setTheme<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">useState<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;light&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>  <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token comment\">\/\/ ThemeContext.Provider \u662f\u4e0a\u4e0b\u6587\u7684&#034;\u63d0\u4f9b\u8005&#034;\u5bb9\u5668<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u6ce8\u610f&#xff1a;Provider \u4e0d\u662f\u53ea\u80fd\u653e\u5728\u5168\u5c40&#xff01;\u4efb\u4f55\u7ec4\u4ef6\u90fd\u53ef\u4ee5\u4f5c\u4e3a\u5c40\u90e8\u5bb9\u5668\u4f7f\u7528<\/span><br \/>\n    <span class=\"token comment\">\/\/ value \u5c5e\u6027\u7528\u4e8e\u5411\u5b50\u6811&#034;\u5e7f\u64ad&#034;\u6570\u636e&#xff0c;\u8986\u76d6 createContext \u7684\u9ed8\u8ba4\u503c<\/span><br \/>\n    <span class=\"token operator\">&lt;<\/span>ThemeContext<span class=\"token punctuation\">.<\/span>Provider value<span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">{<\/span>theme<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n      <span class=\"token punctuation\">{<\/span><span class=\"token comment\">\/* Page \u53ca\u5176\u6240\u6709\u5b50\u5b59\u7ec4\u4ef6&#xff0c;\u90fd\u80fd\u76f4\u63a5\u8bfb\u53d6\u5230 theme *\/<\/span><span class=\"token punctuation\">}<\/span><br \/>\n      <span class=\"token operator\">&lt;<\/span>Page <span class=\"token operator\">\/<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n      <span class=\"token punctuation\">{<\/span><span class=\"token comment\">\/* \u70b9\u51fb\u6309\u94ae\u5207\u6362\u4e3b\u9898&#xff1a;\u5728 &#039;light&#039; \u548c &#039;dark&#039; \u4e4b\u95f4\u5207\u6362 *\/<\/span><span class=\"token punctuation\">}<\/span><br \/>\n      <span class=\"token operator\">&lt;<\/span>button onClick<span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token function\">setTheme<\/span><span class=\"token punctuation\">(<\/span>theme <span class=\"token operator\">&#061;&#061;&#061;<\/span> <span class=\"token string\">&#039;light&#039;<\/span> <span class=\"token operator\">?<\/span> <span class=\"token string\">&#039;dark&#039;<\/span> <span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;light&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">}<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n        \u5207\u6362\u4e3b\u9898<br \/>\n      <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>button<span class=\"token operator\">&gt;<\/span><br \/>\n    <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>ThemeContext<span class=\"token punctuation\">.<\/span>Provider<span class=\"token operator\">&gt;<\/span><br \/>\n  <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">export<\/span> <span class=\"token keyword\">default<\/span> App<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5173\u952e\u89e3\u6790&#xff1a;<\/p>\n<ul>\n<li>&lt;ThemeContext.Provider value&#061;{&#8230;}&gt; \u662f\u63d0\u4f9b\u6570\u636e\u7684\u65b9\u5f0f\u3002value \u662f\u4f60\u60f3\u5171\u4eab\u7684\u4efb\u4f55\u6570\u636e\u2014\u2014\u53ef\u4ee5\u662f\u5b57\u7b26\u4e32\u3001\u6570\u5b57\u3001\u5bf9\u8c61\u3001\u751a\u81f3\u662f\u53e6\u4e00\u4e2a state \u7684\u51fd\u6570\u3002<\/li>\n<li>Provider \u4e0d\u4e00\u5b9a\u8981\u653e\u5728\u5e94\u7528\u6700\u5916\u5c42&#xff0c;\u5b83\u53ef\u4ee5\u653e\u5728\u4efb\u610f\u4f4d\u7f6e&#xff0c;\u53ea\u6709\u5b83\u5305\u88f9\u7684\u90a3\u90e8\u5206\u7ec4\u4ef6\u6811\u624d\u80fd\u6d88\u8d39\u8fd9\u4e2a\u4e0a\u4e0b\u6587\u3002\u8fd9\u662f\u4e00\u79cd&#034;\u5c40\u90e8\u5168\u5c40&#034;\u7684\u8bbe\u8ba1\u3002<\/li>\n<li>\u5f53 value \u7684\u503c\u53d8\u5316\u65f6&#xff0c;\u6240\u6709\u6d88\u8d39\u8be5\u4e0a\u4e0b\u6587\u7684\u7ec4\u4ef6\u90fd\u4f1a\u81ea\u52a8\u91cd\u65b0\u6e32\u67d3&#xff0c;\u4e0d\u9700\u8981\u624b\u52a8\u901a\u77e5\u3002<\/li>\n<\/ul>\n<h4>\u7b2c\u4e09\u6b65&#xff1a;useContext \u6d88\u8d39\u4e0a\u4e0b\u6587<\/h4>\n<p>\u4efb\u4f55\u88ab Provider \u5305\u88f9\u7684\u7ec4\u4ef6&#xff08;\u65e0\u8bba\u5d4c\u5957\u591a\u6df1&#xff09;&#xff0c;\u90fd\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528 useContext \u8bfb\u53d6\u4e0a\u4e0b\u6587\u6570\u636e&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ components\/Page.jsx<\/span><br \/>\n<span class=\"token keyword\">import<\/span> Child <span class=\"token keyword\">from<\/span> <span class=\"token string\">&#039;.\/Child&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> ThemeContext <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">from<\/span> <span class=\"token string\">&#039;..\/ThemeContext&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> useContext <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">from<\/span> <span class=\"token string\">&#039;react&#039;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">const<\/span> <span class=\"token function-variable function\">Page<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token comment\">\/\/ \u4e00\u884c\u4ee3\u7801&#xff0c;\u76f4\u63a5\u62ff\u5230\u4e3b\u9898\u6570\u636e \u2014\u2014 \u4e0d\u9700\u8981\u4ece\u7236\u7ec4\u4ef6\u63a5\u6536 props&#xff01;<\/span><br \/>\n  <span class=\"token keyword\">const<\/span> theme <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">useContext<\/span><span class=\"token punctuation\">(<\/span>ThemeContext<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>theme<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ &#039;light&#039; \u6216 &#039;dark&#039;<\/span><\/p>\n<p>  <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n      <span class=\"token operator\">&lt;<\/span>p<span class=\"token operator\">&gt;<\/span>Page \u7ec4\u4ef6 \u2014\u2014 \u5f53\u524d\u4e3b\u9898&#xff1a;<span class=\"token punctuation\">{<\/span>theme<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>p<span class=\"token operator\">&gt;<\/span><br \/>\n      <span class=\"token operator\">&lt;<\/span>br <span class=\"token operator\">\/<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n      <span class=\"token punctuation\">{<\/span><span class=\"token comment\">\/* Child \u7ec4\u4ef6\u91cc\u4e5f\u6d88\u8d39\u540c\u4e00\u4efd\u4e0a\u4e0b\u6587&#xff0c;\u540c\u6837\u4e0d\u9700\u8981\u4f20 props *\/<\/span><span class=\"token punctuation\">}<\/span><br \/>\n      <span class=\"token operator\">&lt;<\/span>Child <span class=\"token operator\">\/<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n    <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n  <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">export<\/span> <span class=\"token keyword\">default<\/span> Page<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u518d\u770b Child \u7ec4\u4ef6&#xff0c;\u5b83\u751a\u81f3\u66f4\u6df1\u4e00\u5c42&#xff0c;\u540c\u6837\u53ef\u4ee5\u6d88\u8d39\u4e0a\u4e0b\u6587&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ components\/Child.jsx<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> useTheme <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">from<\/span> <span class=\"token string\">&#039;&#064;\/hooks\/useTheme&#039;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">function<\/span> <span class=\"token function\">Child<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token comment\">\/\/ \u4f7f\u7528\u81ea\u5b9a\u4e49 hook \u6d88\u8d39\u4e0a\u4e0b\u6587&#xff08;\u63a8\u8350\u65b9\u5f0f&#xff0c;\u4e0b\u6587\u8be6\u8ff0&#xff09;<\/span><br \/>\n  <span class=\"token keyword\">const<\/span> theme <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">useTheme<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>theme<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>  <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n      <span class=\"token operator\">&lt;<\/span>p<span class=\"token operator\">&gt;<\/span>Child \u7ec4\u4ef6<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>p<span class=\"token operator\">&gt;<\/span><br \/>\n      <span class=\"token operator\">&lt;<\/span>button className<span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">{<\/span>theme<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&gt;<\/span>\u6309\u94ae \u2014\u2014 <span class=\"token punctuation\">{<\/span>theme<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>button<span class=\"token operator\">&gt;<\/span><br \/>\n    <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n  <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">export<\/span> <span class=\"token keyword\">default<\/span> Child<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u6548\u679c\u603b\u7ed3&#xff1a;App \u4e2d\u70b9\u51fb\u6309\u94ae\u5207\u6362 theme state \u2192 Provider \u7684 value \u53d8\u5316 \u2192 Page \u548c Child \u81ea\u52a8\u7528\u65b0 theme \u91cd\u65b0\u6e32\u67d3\u3002\u6574\u4e2a\u8fc7\u7a0b&#xff0c;App \u6ca1\u6709\u5411 Page \u4f20\u4efb\u4f55 props&#xff0c;Page \u4e5f\u6ca1\u6709\u5411 Child \u4f20 props\u3002\u8de8\u8d8a\u5c42\u7ea7&#xff0c;\u76f4\u63a5\u901a\u4fe1\u3002<\/p>\n<hr \/>\n<h3>\u4e94\u3001\u81ea\u5b9a\u4e49 Hooks&#xff1a;\u628a\u4e0a\u4e0b\u6587\u6d88\u8d39\u5c01\u88c5\u8d77\u6765<\/h3>\n<h4>5.1 \u4e3a\u4ec0\u4e48\u9700\u8981\u81ea\u5b9a\u4e49 Hook&#xff1f;<\/h4>\n<p>\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d&#xff0c;Page.jsx \u8fd9\u6837\u6d88\u8d39\u4e0a\u4e0b\u6587&#xff1a;<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> ThemeContext <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">from<\/span> <span class=\"token string\">&#039;..\/ThemeContext&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> useContext <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">from<\/span> <span class=\"token string\">&#039;react&#039;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">const<\/span> theme <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">useContext<\/span><span class=\"token punctuation\">(<\/span>ThemeContext<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u6837\u5199\u5b8c\u5168\u53ef\u4ee5\u5de5\u4f5c&#xff0c;\u4f46\u5b58\u5728\u4e24\u4e2a\u95ee\u9898&#xff1a;<\/p>\n<li>\u6bcf\u4e2a\u6d88\u8d39\u7ec4\u4ef6\u90fd\u8981\u540c\u65f6\u5f15\u5165 ThemeContext \u548c useContext&#xff0c;\u4ee3\u7801\u6709\u91cd\u590d<\/li>\n<li>\u5982\u679c\u54ea\u5929 Context \u7684\u7ed3\u6784\u53d8\u4e86&#xff08;\u6bd4\u5982 key \u540d\u6539\u4e86&#xff09;&#xff0c;\u6240\u6709\u6d88\u8d39\u7ec4\u4ef6\u90fd\u8981\u6539<\/li>\n<p>\u66f4\u597d\u7684\u505a\u6cd5\u662f&#xff1a;\u628a useContext \u8c03\u7528\u5c01\u88c5\u6210\u81ea\u5b9a\u4e49 Hook&#xff0c;\u6d88\u8d39\u8005\u53ea\u9700\u8981\u8c03\u7528\u8fd9\u4e2a Hook \u5373\u53ef\u3002<\/p>\n<h4>5.2 \u5c01\u88c5 useTheme Hook<\/h4>\n<p><span class=\"token comment\">\/\/ hooks\/useTheme.js<\/span><br \/>\n<span class=\"token comment\">\/\/ React \u5168\u9762\u8fdb\u5165 Hooks \u7f16\u7a0b\u65f6\u4ee3&#xff0c;\u53ef\u4ee5\u4f7f\u7528 React\u3001react-router-dom \u7b49\u63d0\u4f9b\u7684 Hooks<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8fd8\u53ef\u4ee5\u81ea\u5b9a\u4e49 Hook \u2014\u2014 \u4ee5 use \u5f00\u5934\u7684\u51fd\u6570&#xff0c;\u81ea\u5df1\u5c01\u88c5\u7684&#xff0c;\u7b80\u5355\u597d\u7528<\/span><br \/>\n<span class=\"token comment\">\/\/ \u6bd4\u666e\u901a\u51fd\u6570\u5c01\u88c5\u66f4\u5f3a\u7684\u5730\u65b9&#xff1a;\u53ef\u4ee5\u628a React \u7684\u54cd\u5e94\u5f0f\u3001\u526f\u4f5c\u7528\u7b49\u903b\u8f91\u4e00\u5e76\u5c01\u88c5\u8fdb\u53bb<\/span><br \/>\n<span class=\"token comment\">\/\/ \u5728 Provider \u5305\u88f9\u7684\u4efb\u4f55\u5c42\u7ea7\u7ec4\u4ef6\u4e2d&#xff0c;\u591a\u5904\u6d88\u8d39\u6570\u636e&#xff0c;\u6a21\u5757\u5316\u62bd\u79bb\u653e\u5230 hooks \u76ee\u5f55\u4e0b<\/span><\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> ThemeContext <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">from<\/span> <span class=\"token string\">&#039;&#064;\/ThemeContext&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> useContext <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">from<\/span> <span class=\"token string\">&#039;react&#039;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u7ea6\u5b9a&#xff1a;\u81ea\u5b9a\u4e49 Hook \u5fc5\u987b\u4ee5 use \u5f00\u5934<\/span><br \/>\n<span class=\"token keyword\">export<\/span> <span class=\"token keyword\">function<\/span> <span class=\"token function\">useTheme<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token comment\">\/\/ \u5185\u90e8\u5c01\u88c5\u4e86 useContext \u8c03\u7528&#xff0c;\u5bf9\u5916\u66b4\u9732\u7684\u662f\u4e00\u4e2a\u5e72\u51c0\u7684\u63a5\u53e3<\/span><br \/>\n  <span class=\"token keyword\">return<\/span> <span class=\"token function\">useContext<\/span><span class=\"token punctuation\">(<\/span>ThemeContext<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6d88\u8d39\u65b9\u4f7f\u7528\u5c31\u53d8\u5f97\u975e\u5e38\u7b80\u6d01&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u53ea\u9700\u8981\u5f15\u5165 useTheme \u5373\u53ef&#xff0c;\u4e0d\u9700\u8981\u77e5\u9053 ThemeContext \u7684\u5b58\u5728<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> useTheme <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">from<\/span> <span class=\"token string\">&#039;&#064;\/hooks\/useTheme&#039;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">function<\/span> <span class=\"token function\">Child<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">const<\/span> theme <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">useTheme<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5e72\u51c0\u5229\u843d<\/span><br \/>\n  <span class=\"token comment\">\/\/ &#8230;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u81ea\u5b9a\u4e49 Hook \u7684\u4f18\u52bf&#xff1a;<\/p>\n<ul>\n<li>\u5c01\u88c5\u7ec6\u8282&#xff1a;\u6d88\u8d39\u8005\u4e0d\u9700\u8981\u77e5\u9053\u5e95\u5c42\u662f Context \u8fd8\u662f\u5176\u4ed6\u65b9\u5f0f&#xff0c;\u6362\u4e86\u5b9e\u73b0\u4e5f\u4e0d\u5f71\u54cd\u4f7f\u7528\u65b9<\/li>\n<li>\u7edf\u4e00\u7ba1\u7406&#xff1a;\u6240\u6709\u5bf9 ThemeContext \u7684\u8bbf\u95ee\u6536\u655b\u5230\u4e00\u4e2a\u51fd\u6570\u4e2d&#xff0c;\u65b9\u4fbf\u7ef4\u62a4<\/li>\n<li>\u53ef\u6d4b\u8bd5\u6027&#xff1a;\u53ef\u4ee5\u5355\u72ec\u4e3a Hook \u7f16\u5199\u6d4b\u8bd5<\/li>\n<li>\u6a21\u5757\u5316&#xff1a;\u653e\u5728 hooks\/ \u76ee\u5f55\u4e0b&#xff0c;\u5c5e\u4e8e\u57fa\u7840\u8bbe\u65bd\u5c42 \/ \u67b6\u6784\u5c42\u4ee3\u7801<\/li>\n<\/ul>\n<h4>5.3 \u81ea\u5b9a\u4e49 Hook \u7684\u672c\u8d28<\/h4>\n<p>\u81ea\u5b9a\u4e49 Hook \u672c\u8d28\u4e0a\u5c31\u662f\u4ee5 use \u5f00\u5934\u7684\u666e\u901a JavaScript \u51fd\u6570\u3002\u548c\u666e\u901a\u51fd\u6570\u7684\u533a\u522b\u5728\u4e8e&#xff1a;<\/p>\n<table>\n<tr>\u5bf9\u6bd4\u7ef4\u5ea6\u666e\u901a\u51fd\u6570\u81ea\u5b9a\u4e49 Hook<\/tr>\n<tbody>\n<tr>\n<td>\u80fd\u5426\u8c03\u7528 React Hooks&#xff08;useState\u3001useEffect \u7b49&#xff09;<\/td>\n<td>\u2717 \u4e0d\u80fd<\/td>\n<td>\u2713 \u53ef\u4ee5<\/td>\n<\/tr>\n<tr>\n<td>\u80fd\u5426\u5c01\u88c5\u54cd\u5e94\u5f0f\u6570\u636e\u903b\u8f91<\/td>\n<td>\u2717 \u4e0d\u80fd<\/td>\n<td>\u2713 \u53ef\u4ee5<\/td>\n<\/tr>\n<tr>\n<td>\u547d\u540d\u89c4\u8303<\/td>\n<td>\u65e0\u5f3a\u5236\u8981\u6c42<\/td>\n<td>\u5fc5\u987b\u4ee5 use \u5f00\u5934<\/td>\n<\/tr>\n<tr>\n<td>\u9002\u7528\u573a\u666f<\/td>\n<td>\u5de5\u5177\u51fd\u6570\u3001\u7eaf\u903b\u8f91<\/td>\n<td>\u72b6\u6001\u3001\u526f\u4f5c\u7528\u3001Context \u7b49 React \u7279\u6027<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h3>\u516d\u3001\u7efc\u5408\u5b9e\u6218&#xff1a;\u76d1\u542c\u9f20\u6807\u79fb\u52a8&#xff0c;\u5750\u6807\u5b9e\u65f6\u663e\u793a<\/h3>\n<p>\u638c\u63e1\u4e86 Context \u548c\u81ea\u5b9a\u4e49 Hook&#xff0c;\u6211\u4eec\u6765\u770b\u4e00\u4e2a\u4e0d\u6d89\u53ca Context\u3001\u4f46\u540c\u6837\u4f53\u73b0\u81ea\u5b9a\u4e49 Hook \u4ef7\u503c\u7684\u5b9e\u6218\u6848\u4f8b\u2014\u2014\u5c01\u88c5\u9f20\u6807\u5750\u6807\u8ffd\u8e2a\u3002<\/p>\n<h4>6.1 \u9700\u6c42\u5206\u6790<\/h4>\n<p>\u76ee\u6807&#xff1a;\u5728\u9875\u9762\u4e0a\u5b9e\u65f6\u663e\u793a\u9f20\u6807\u7684 X\u3001Y \u5750\u6807\u3002<\/p>\n<p>\u601d\u8def\u62bd\u8c61&#xff1a;\u628a&#034;\u8ffd\u8e2a\u9f20\u6807\u5750\u6807&#034;\u8fd9\u6bb5\u903b\u8f91\u62bd\u8c61\u6210\u4e00\u4e2a\u54cd\u5e94\u5f0f\u7684\u6570\u636e\u6e90\u2014\u2014useMouse Hook\u3002\u54ea\u4e2a\u7ec4\u4ef6\u9700\u8981\u9f20\u6807\u5750\u6807&#xff0c;\u76f4\u63a5\u8c03\u7528\u5b83\u5373\u53ef&#xff0c;\u4e0d\u9700\u8981\u5728\u6bcf\u4e2a\u7ec4\u4ef6\u91cc\u5199\u4e00\u904d\u4e8b\u4ef6\u76d1\u542c\u7684\u4ee3\u7801\u3002<\/p>\n<h4>6.2 \u5b8c\u6574\u4ee3\u7801\u5b9e\u73b0<\/h4>\n<p><span class=\"token comment\">\/\/ hooks\/useMouse.js<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> useState<span class=\"token punctuation\">,<\/span> useEffect <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">from<\/span> <span class=\"token string\">&#039;react&#039;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">export<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token function-variable function\">useMouse<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token comment\">\/\/ \u2460 \u7528\u4e24\u4e2a state \u5206\u522b\u5b58\u50a8\u9f20\u6807\u7684 x\u3001y \u5750\u6807<\/span><br \/>\n  <span class=\"token keyword\">const<\/span> <span class=\"token punctuation\">[<\/span>x<span class=\"token punctuation\">,<\/span> setX<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">useState<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token keyword\">const<\/span> <span class=\"token punctuation\">[<\/span>y<span class=\"token punctuation\">,<\/span> setY<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">useState<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>  <span class=\"token comment\">\/\/ \u2461 useEffect \u76d1\u542c\u526f\u4f5c\u7528&#xff1a;\u7ed1\u5b9a\/\u89e3\u7ed1\u4e8b\u4ef6<\/span><br \/>\n  <span class=\"token function\">useEffect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u2462 \u4e8b\u4ef6\u5904\u7406\u51fd\u6570&#xff1a;\u9f20\u6807\u79fb\u52a8\u65f6\u66f4\u65b0 state<\/span><br \/>\n    <span class=\"token keyword\">function<\/span> <span class=\"token function\">handleMouseMove<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">e<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n      <span class=\"token function\">setX<\/span><span class=\"token punctuation\">(<\/span>e<span class=\"token punctuation\">.<\/span>clientX<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ clientX \u662f\u9f20\u6807\u76f8\u5bf9\u4e8e\u6d4f\u89c8\u5668\u7a97\u53e3\u7684\u6c34\u5e73\u5750\u6807<\/span><br \/>\n      <span class=\"token function\">setY<\/span><span class=\"token punctuation\">(<\/span>e<span class=\"token punctuation\">.<\/span>clientY<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ clientY \u662f\u9f20\u6807\u76f8\u5bf9\u4e8e\u6d4f\u89c8\u5668\u7a97\u53e3\u7684\u5782\u76f4\u5750\u6807<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u2463 \u7ed1\u5b9a\u4e8b\u4ef6\u76d1\u542c\u5668<\/span><br \/>\n    document<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;mousemove&#039;<\/span><span class=\"token punctuation\">,<\/span> handleMouseMove<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u2464 \u6e05\u7406\u51fd\u6570&#xff1a;\u7ec4\u4ef6\u5378\u8f7d\u65f6\u81ea\u52a8\u79fb\u9664\u4e8b\u4ef6\u76d1\u542c<\/span><br \/>\n    <span class=\"token comment\">\/\/    \u5b9a\u65f6\u5668\u3001Web Worker\u3001\u4e8b\u4ef6\u76d1\u542c\u7b49\u8d44\u6e90&#xff0c;React \u4e0d\u4f1a\u4e3b\u52a8\u56de\u6536<\/span><br \/>\n    <span class=\"token comment\">\/\/    \u5fc5\u987b\u624b\u52a8\u6e05\u7406&#xff0c;\u5426\u5219\u4f1a\u9020\u6210\u5185\u5b58\u6cc4\u6f0f<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n      document<span class=\"token punctuation\">.<\/span><span class=\"token function\">removeEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;mousemove&#039;<\/span><span class=\"token punctuation\">,<\/span> handleMouseMove<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u7a7a\u4f9d\u8d56\u6570\u7ec4&#xff0c;\u53ea\u5728\u7ec4\u4ef6\u6302\u8f7d\u65f6\u6267\u884c\u4e00\u6b21<\/span><\/p>\n<p>  <span class=\"token comment\">\/\/ \u2465 \u8fd4\u56de\u5750\u6807\u6570\u636e&#xff0c;\u4f9b\u7ec4\u4ef6\u4f7f\u7528<\/span><br \/>\n  <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">{<\/span> x<span class=\"token punctuation\">,<\/span> y <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>6.3 \u5728\u7ec4\u4ef6\u4e2d\u4f7f\u7528<\/h4>\n<p><span class=\"token comment\">\/\/ App.jsx<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> useMouse <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">from<\/span> <span class=\"token string\">&#039;.\/hooks\/useMouse&#039;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">function<\/span> <span class=\"token function\">App<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token comment\">\/\/ \u4f7f\u7528\u81ea\u5b9a\u4e49 Hook \u83b7\u53d6\u9f20\u6807\u5750\u6807 \u2014\u2014 \u4ee3\u7801\u975e\u5e38\u7b80\u6d01&#xff01;<\/span><br \/>\n  <span class=\"token keyword\">const<\/span> <span class=\"token punctuation\">{<\/span> x<span class=\"token punctuation\">,<\/span> y <span class=\"token punctuation\">}<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">useMouse<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>  <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token operator\">&lt;<\/span>div style<span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">{<\/span><br \/>\n      <span class=\"token literal-property property\">height<\/span><span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;100vh&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n      <span class=\"token literal-property property\">display<\/span><span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;flex&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n      <span class=\"token literal-property property\">alignItems<\/span><span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;center&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n      <span class=\"token literal-property property\">justifyContent<\/span><span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;center&#039;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">}<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n      <span class=\"token punctuation\">{<\/span><span class=\"token comment\">\/* x \u548c y \u4e3a null \u8868\u793a\u9f20\u6807\u8fd8\u6ca1\u79fb\u52a8\u8fc7 *\/<\/span><span class=\"token punctuation\">}<\/span><br \/>\n      <span class=\"token punctuation\">{<\/span>x <span class=\"token operator\">&amp;&amp;<\/span> y <span class=\"token operator\">?<\/span> <span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\">\u5f53\u524d\u9f20\u6807\u5750\u6807&#xff1a;x: <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>x<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token string\">, y: <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>y<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token template-punctuation string\">&#096;<\/span><\/span> <span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;\u9f20\u6807\u672a\u79fb\u52a8&#039;<\/span><span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>div<span class=\"token operator\">&gt;<\/span><br \/>\n  <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">export<\/span> <span class=\"token keyword\">default<\/span> App<span class=\"token punctuation\">;<\/span><\/p>\n<h4>6.4 \u4ee3\u7801\u6267\u884c\u6d41\u7a0b\u89e3\u6790<\/h4>\n<p>\u7ec4\u4ef6\u9996\u6b21\u6e32\u67d3 \u2192 useMouse() \u6267\u884c<br \/>\n                \u2192 useState(null) \u521b\u5efa x\u3001y \u72b6\u6001<br \/>\n                \u2192 useEffect \u6ce8\u518c mousemove \u76d1\u542c\u5668<br \/>\n                \u2192 \u8fd4\u56de {x: null, y: null}<br \/>\n                \u2192 \u7ec4\u4ef6\u6e32\u67d3 &#034;\u9f20\u6807\u672a\u79fb\u52a8&#034;<\/p>\n<p>\u7528\u6237\u79fb\u52a8\u9f20\u6807 \u2192 handleMouseMove \u88ab\u8c03\u7528<br \/>\n                \u2192 setX \/ setY \u66f4\u65b0\u72b6\u6001<br \/>\n                \u2192 React \u68c0\u6d4b\u5230\u72b6\u6001\u53d8\u5316<br \/>\n                \u2192 \u7ec4\u4ef6\u91cd\u65b0\u6e32\u67d3&#xff0c;\u663e\u793a\u6700\u65b0\u5750\u6807<\/p>\n<p>\u7ec4\u4ef6\u5378\u8f7d     \u2192 useEffect \u7684\u6e05\u7406\u51fd\u6570\u6267\u884c<br \/>\n                \u2192 removeEventListener \u79fb\u9664\u76d1\u542c\u5668<br \/>\n                \u2192 \u907f\u514d\u5185\u5b58\u6cc4\u6f0f<\/p>\n<h4>6.5 \u548c Context \u7684\u5173\u7cfb<\/h4>\n<p>\u6ce8\u610f&#xff1a;useMouse \u8fd9\u4e2a Hook \u6ca1\u6709\u7528\u5230 Context&#xff0c;\u5b83\u5c55\u793a\u7684\u662f\u81ea\u5b9a\u4e49 Hook \u7684\u53e6\u4e00\u4e2a\u91cd\u8981\u7528\u9014\u2014\u2014\u5c01\u88c5\u526f\u4f5c\u7528&#xff08;useEffect&#xff09;\u548c\u54cd\u5e94\u5f0f\u6570\u636e&#xff08;useState&#xff09;\u3002<\/p>\n<p>  #mermaid-svg-5BbMwOuOGK4zLdVO{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-5BbMwOuOGK4zLdVO .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-5BbMwOuOGK4zLdVO .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-5BbMwOuOGK4zLdVO .error-icon{fill:#552222;}#mermaid-svg-5BbMwOuOGK4zLdVO .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-5BbMwOuOGK4zLdVO .edge-thickness-normal{stroke-width:1px;}#mermaid-svg-5BbMwOuOGK4zLdVO .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-5BbMwOuOGK4zLdVO .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-5BbMwOuOGK4zLdVO .edge-thickness-invisible{stroke-width:0;fill:none;}#mermaid-svg-5BbMwOuOGK4zLdVO .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-5BbMwOuOGK4zLdVO .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-5BbMwOuOGK4zLdVO .marker{fill:#333333;stroke:#333333;}#mermaid-svg-5BbMwOuOGK4zLdVO .marker.cross{stroke:#333333;}#mermaid-svg-5BbMwOuOGK4zLdVO svg{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-5BbMwOuOGK4zLdVO p{margin:0;}#mermaid-svg-5BbMwOuOGK4zLdVO .label{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;color:#333;}#mermaid-svg-5BbMwOuOGK4zLdVO .cluster-label text{fill:#333;}#mermaid-svg-5BbMwOuOGK4zLdVO .cluster-label span{color:#333;}#mermaid-svg-5BbMwOuOGK4zLdVO .cluster-label span p{background-color:transparent;}#mermaid-svg-5BbMwOuOGK4zLdVO .label text,#mermaid-svg-5BbMwOuOGK4zLdVO span{fill:#333;color:#333;}#mermaid-svg-5BbMwOuOGK4zLdVO .node rect,#mermaid-svg-5BbMwOuOGK4zLdVO .node circle,#mermaid-svg-5BbMwOuOGK4zLdVO .node ellipse,#mermaid-svg-5BbMwOuOGK4zLdVO .node polygon,#mermaid-svg-5BbMwOuOGK4zLdVO .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-5BbMwOuOGK4zLdVO .rough-node .label text,#mermaid-svg-5BbMwOuOGK4zLdVO .node .label text,#mermaid-svg-5BbMwOuOGK4zLdVO .image-shape .label,#mermaid-svg-5BbMwOuOGK4zLdVO .icon-shape .label{text-anchor:middle;}#mermaid-svg-5BbMwOuOGK4zLdVO .node .katex path{fill:#000;stroke:#000;stroke-width:1px;}#mermaid-svg-5BbMwOuOGK4zLdVO .rough-node .label,#mermaid-svg-5BbMwOuOGK4zLdVO .node .label,#mermaid-svg-5BbMwOuOGK4zLdVO .image-shape .label,#mermaid-svg-5BbMwOuOGK4zLdVO .icon-shape .label{text-align:center;}#mermaid-svg-5BbMwOuOGK4zLdVO .node.clickable{cursor:pointer;}#mermaid-svg-5BbMwOuOGK4zLdVO .root .anchor path{fill:#333333!important;stroke-width:0;stroke:#333333;}#mermaid-svg-5BbMwOuOGK4zLdVO .arrowheadPath{fill:#333333;}#mermaid-svg-5BbMwOuOGK4zLdVO .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-5BbMwOuOGK4zLdVO .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-5BbMwOuOGK4zLdVO .edgeLabel{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-5BbMwOuOGK4zLdVO .edgeLabel p{background-color:rgba(232,232,232, 0.8);}#mermaid-svg-5BbMwOuOGK4zLdVO .edgeLabel rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-5BbMwOuOGK4zLdVO .labelBkg{background-color:rgba(232, 232, 232, 0.5);}#mermaid-svg-5BbMwOuOGK4zLdVO .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-5BbMwOuOGK4zLdVO .cluster text{fill:#333;}#mermaid-svg-5BbMwOuOGK4zLdVO .cluster span{color:#333;}#mermaid-svg-5BbMwOuOGK4zLdVO div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-5BbMwOuOGK4zLdVO .flowchartTitleText{text-anchor:middle;font-size:18px;fill:#333;}#mermaid-svg-5BbMwOuOGK4zLdVO rect.text{fill:none;stroke-width:0;}#mermaid-svg-5BbMwOuOGK4zLdVO .icon-shape,#mermaid-svg-5BbMwOuOGK4zLdVO .image-shape{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-5BbMwOuOGK4zLdVO .icon-shape p,#mermaid-svg-5BbMwOuOGK4zLdVO .image-shape p{background-color:rgba(232,232,232, 0.8);padding:2px;}#mermaid-svg-5BbMwOuOGK4zLdVO .icon-shape .label rect,#mermaid-svg-5BbMwOuOGK4zLdVO .image-shape .label rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-5BbMwOuOGK4zLdVO .label-icon{display:inline-block;height:1em;overflow:visible;vertical-align:-0.125em;}#mermaid-svg-5BbMwOuOGK4zLdVO .node .label-icon path{fill:currentColor;stroke:revert;stroke-width:revert;}#mermaid-svg-5BbMwOuOGK4zLdVO :root{&#8211;mermaid-font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;}<\/p>\n<p>           <span class=\"nodeLabel\"><\/p>\n<p>\u526f\u4f5c\u7528\u573a\u666f<\/p>\n<p><\/span><\/p>\n<p>           <span class=\"edgeLabel\"><\/span><\/p>\n<p>           <span class=\"nodeLabel\"><\/p>\n<p>useMouse<\/p>\n<p><\/span><\/p>\n<p>           <span class=\"nodeLabel\"><\/p>\n<p>\u5c01\u88c5 useState &#043; useEffect\u590d\u7528\u72b6\u6001\u903b\u8f91<\/p>\n<p><\/span><\/p>\n<p>           <span class=\"nodeLabel\"><\/p>\n<p>Context \u573a\u666f<\/p>\n<p><\/span><\/p>\n<p>           <span class=\"edgeLabel\"><\/span><\/p>\n<p>           <span class=\"nodeLabel\"><\/p>\n<p>useTheme<\/p>\n<p><\/span><\/p>\n<p>           <span class=\"nodeLabel\"><\/p>\n<p>\u5c01\u88c5 useContext\u8de8\u7ec4\u4ef6\u5171\u4eab\u6570\u636e<\/p>\n<p><\/span><\/p>\n<p>\u4e24\u8005\u90fd\u662f\u81ea\u5b9a\u4e49 Hook&#xff0c;\u53ea\u662f\u5c01\u88c5\u7684 React \u7279\u6027\u4e0d\u540c&#xff1a;<\/p>\n<ul>\n<li>Context \u578b Hook&#xff08;useTheme&#xff09;&#xff1a;\u89e3\u51b3&#034;\u8de8\u5c42\u7ea7\u6570\u636e\u5171\u4eab&#034;<\/li>\n<li>\u526f\u4f5c\u7528\u578b Hook&#xff08;useMouse&#xff09;&#xff1a;\u89e3\u51b3&#034;\u54cd\u5e94\u5f0f\u903b\u8f91\u590d\u7528&#034;<\/li>\n<\/ul>\n<hr \/>\n<h3>\u4e03\u3001\u5168\u6587\u603b\u7ed3<\/h3>\n<h4>7.1 \u77e5\u8bc6\u8def\u5f84\u56de\u987e<\/h4>\n<p>\u672c\u6587\u4ece React \u7ec4\u4ef6\u901a\u4fe1\u7684\u5b9e\u9645\u75db\u70b9\u51fa\u53d1&#xff0c;\u6cbf\u7740\u4ee5\u4e0b\u8def\u5f84\u9010\u6b65\u6df1\u5165&#xff1a;<\/p>\n<p>\u7ec4\u4ef6\u901a\u4fe1\u56db\u79cd\u5173\u7cfb \u2192 Props \u900f\u4f20\u95ee\u9898 \u2192 Context \u673a\u5236\u539f\u7406<br \/>\n\u2192 createContext \/ Provider \/ useContext \u4e09\u6b65\u6cd5<br \/>\n\u2192 \u81ea\u5b9a\u4e49 Hook \u5c01\u88c5&#xff08;useTheme&#xff09;\u2192 \u526f\u4f5c\u7528\u5c01\u88c5&#xff08;useMouse&#xff09;<\/p>\n<p>\u6838\u5fc3\u7ed3\u8bba&#xff1a;useContext \u4e0d\u662f\u7528\u6765\u66ff\u4ee3 props \u7684&#xff0c;\u800c\u662f\u5728 props \u4f20\u9012\u53d8\u5f97\u7e41\u7410\u65f6\u7684\u4e00\u79cd\u4f18\u96c5\u8865\u5145\u3002\u5bf9\u4e8e\u6d45\u5c42\u901a\u4fe1&#xff0c;props \u8db3\u591f\u4e14\u66f4\u76f4\u89c2&#xff1b;\u5bf9\u4e8e\u8de8\u5c42\u7ea7\u5171\u4eab\u6570\u636e&#xff0c;Context \u662f\u6700\u5408\u9002\u7684\u539f\u751f\u65b9\u6848\u3002<\/p>\n<h4>7.2 \u6838\u5fc3\u77e5\u8bc6\u70b9\u590d\u76d8<\/h4>\n<table>\n<tr>\u77e5\u8bc6\u70b9\u4e00\u53e5\u8bdd\u603b\u7ed3<\/tr>\n<tbody>\n<tr>\n<td>\u5355\u5411\u6570\u636e\u6d41<\/td>\n<td>React \u6570\u636e\u4ece\u7236\u5230\u5b50\u901a\u8fc7 props \u6d41\u52a8&#xff0c;\u662f React \u7684\u6838\u5fc3\u8bbe\u8ba1\u539f\u5219<\/td>\n<\/tr>\n<tr>\n<td>Props \u900f\u4f20<\/td>\n<td>\u4e2d\u95f4\u7ec4\u4ef6\u88ab\u8feb\u8f6c\u53d1\u4e0d\u5173\u5fc3\u7684 props&#xff0c;\u5c42\u6b21\u6df1\u65f6\u96be\u4ee5\u7ef4\u62a4<\/td>\n<\/tr>\n<tr>\n<td>createContext<\/td>\n<td>\u521b\u5efa\u4e00\u4e2a\u4e0a\u4e0b\u6587\u5bb9\u5668&#xff0c;\u53c2\u6570\u4e3a\u9ed8\u8ba4\u503c<\/td>\n<\/tr>\n<tr>\n<td>Provider<\/td>\n<td>\u5305\u88f9\u7ec4\u4ef6\u6811&#xff0c;\u901a\u8fc7 value 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Zustand&#xff09;&#xff1f;<\/p>\n<table>\n<tr>\u573a\u666f\u63a8\u8350\u65b9\u6848<\/tr>\n<tbody>\n<tr>\n<td>\u5c11\u91cf\u5168\u5c40\u6570\u636e&#xff08;\u4e3b\u9898\u3001\u8bed\u8a00\u3001\u7528\u6237\u4fe1\u606f&#xff09;<\/td>\n<td>Context \u8db3\u591f<\/td>\n<\/tr>\n<tr>\n<td>\u9891\u7e41\u66f4\u65b0\u7684\u72b6\u6001&#xff08;\u5982\u52a8\u753b\u5e27\u3001\u8f93\u5165\u6846\u5b9e\u65f6\u503c&#xff09;<\/td>\n<td>\u4e0d\u9002\u5408 Context&#xff0c;\u9891\u7e41\u53d8\u5316\u4f1a\u5bfc\u81f4\u6574\u4e2a\u5b50\u6811\u91cd\u6e32\u67d3<\/td>\n<\/tr>\n<tr>\n<td>\u590d\u6742\u7684\u72b6\u6001\u903b\u8f91\u3001\u4e2d\u95f4\u4ef6\u3001\u8c03\u8bd5\u5de5\u5177<\/td>\n<td>\u72b6\u6001\u7ba1\u7406\u5e93&#xff08;Redux\u3001Zustand&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u4e0d\u60f3\u5f15\u5165\u7b2c\u4e09\u65b9\u4f9d\u8d56<\/td>\n<td>Context &#043; useReducer \u7ec4\u5408<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Q2&#xff1a;Provider \u7684 value 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effect<\/li>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u76ee\u5f55\u4e00\u3001\u524d\u8a00&#xff1a;\u4ec0\u4e48\u662f\\&#8221;\u4e0a\u4e0b\u6587\\&#8221;&#xff1f;\u4e8c\u3001\u7ec4\u4ef6\u901a\u4fe1\u7684\u56db\u79cd\u5173\u7cfb\u4e09\u3001\u5f53\u7ec4\u4ef6\u5c42\u6b21\u5f88\u6df1\u65f6\u2014\u2014useContext \u767b\u573a3.1 \u5b83\u89e3\u51b3\u4e86\u4ec0\u4e48\u95ee\u9898&#xff1f;3.2 \u6838\u5fc3\u89d2\u8272&#xff1a;Provider \u4e0e Consumer\u56db\u3001useContext \u4e09\u6b65\u8d70&#xff08;\u5b9e\u6218\u5b8c\u6574\u4ee3\u7801&#xff09;\u7b2c\u4e00\u6b65&#xff1a;createContext \u521b\u5efa\u4e0a\u4e0b\u6587\u7b2c\u4e8c\u6b65&#xff1a;Provider \u5305\u88f9\u7ec4\u4ef6\u6811\u7b2c\u4e09\u6b65&#xff1a;useContext 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