{"id":38047,"date":"2022-12-22T20:01:24","date_gmt":"2023-04-09T04:08:00","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9b%9e%e5%ba%94%e7%9a%84%e5%a4%87%e5%bf%98%e5%bd%95\/"},"modified":"2024-04-29T06:31:49","modified_gmt":"2024-04-28T22:31:49","slug":"%e5%9b%9e%e5%ba%94%e7%9a%84%e5%a4%87%e5%bf%98%e5%bd%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9b%9e%e5%ba%94%e7%9a%84%e5%a4%87%e5%bf%98%e5%bd%95\/","title":{"rendered":"\u56de\u5e94\u7684\u5907\u5fd8\u5f55"},"content":{"rendered":"<h1>React \u662f\u4ec0\u4e48<\/h1>\n<div>Meta\u5f00\u53d1\u7684JavaScript\u5e93<\/div>\n<p>\u6709\u4ee5\u4e0b3\u4e2a\u7279\u70b9\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Declarative(\u5ba3\u8a00\u7684)<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Component-Base(\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u30d9\u30fc\u30b9)<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">Learn Once, Write Anywhere(\u4e00\u5ea6\u306e\u5b66\u3073\u3067\u306a\u3093\u3067\u3082\u66f8\u3051\u308b)<\/ul>\n<h1>JSX\uff08JavaScript XML\uff09\u662f\u4e00\u79cd\u5728 JavaScript \u4e2d\u7f16\u5199\u53ef\u5d4c\u5165 HTML \u7ed3\u6784\u7684\u8bed\u6cd5\u3002<\/h1>\n<div>JavaScript\u88ab\u6269\u5c55\u4e3a\u80fd\u591f\u7f16\u5199HTML\u6587\u6863\u7684\u5de5\u5177\u3002<\/div>\n<p>TSX\u662f\u5bf9JavaScript\u7684\u6269\u5c55\u8bed\u6cd5\uff0c\u7c7b\u4f3c\u4e8eJavaScript\u7684JSX\u3002TSX\u5141\u8bb8\u6211\u4eec\u5728TypeScript\u4e2d\u7f16\u5199HTML\u4ee3\u7801\u3002<br \/>\n\u5982\u679c\u6211\u4eec\u60f3\u8981\u5728TSX\u4e2d\u4f7f\u7528JavaScript\u8bed\u6cd5\uff0c\u53ef\u4ee5\u4f7f\u7528\u82b1\u62ec\u53f7{}\u6765\u5305\u56f4\u5b83\u3002<\/p>\n<h1>\u5728\u4e2d\u6587\u4e2d\uff0c&#8221;\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8&#8221;\u53ef\u4ee5\u7ffb\u8bd1\u4e3a&#8221;\u7ec4\u4ef6&#8221;\u3002<\/h1>\n<div>\u5916\u89c2\u548c\u884c\u4e3a\u8054\u5408\u7684\u754c\u9762\u7ec4\u4ef6\u7684\u6700\u5c0f\u5355\u4f4d\u3002<\/div>\n<p>\u96a8\u8457Hooks\u7684\u51fa\u73fe\uff0c\u4f7f\u7528\u51fd\u6578\u7d44\u4ef6\u8b8a\u5f97\u666e\u904d\uff0c\u539f\u672cReact\u4e2d\u5b58\u5728\u51fd\u6578\u7d44\u4ef6\u548c\u985e\u7d44\u4ef6\u3002<\/p>\n<h1>\u4e0a\u4e0b\u6587\u662f<\/h1>\n<h1>React Hooks \u53cd\u5e94\u94a9\u5b50<\/h1>\n<p>\u53ea\u6709\u5728React\u51fd\u6570\u5185\u90e8\u8c03\u7528Hook\u3002<\/p>\n<h2>\u4f7f\u7528\u72b6\u6001<\/h2>\n<p>useState\u662f\u7528\u4e8e\u7ba1\u7406\u7ec4\u4ef6\u72b6\u6001\u7684Hook\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">\u72b6\u614b\u3092\u8868\u3059\u5909\u6570<\/span><span class=\"p\">,<\/span><span class=\"nx\">\u72b6\u614b\u3092\u5909\u5316\u3055\u305b\u308b\u95a2\u6570\u540d<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">(<\/span><span class=\"nx\">\u72b6\u614b\u306e\u521d\u671f\u5024<\/span><span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">count<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setCount<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">(<\/span><span class=\"mi\">0<\/span><span class=\"p\">)<\/span>\r\n<span class=\"c1\">\/\/ count\u306e\u5024\u3092\u66f4\u65b0<\/span>\r\n<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=\"c1\">\/\/ \u307e\u305f\u306f\u3053\u3063\u3061<\/span>\r\n<span class=\"nf\">setCount<\/span><span class=\"p\">((<\/span><span class=\"nx\">preCount<\/span><span class=\"p\">)<\/span><span class=\"o\">=&gt;<\/span><span class=\"nx\">preCount<\/span><span class=\"o\">+<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<div>\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u7528\u4e8e\u6539\u53d8\u72b6\u6001\u7684\u51fd\u6570\u7684\u540d\u5b57\u88ab\u79f0\u4e3aset\u53d8\u91cf\u540d\u3002<\/div>\n<p>\u5982\u679c\u5728useState\u4e2d\u5904\u7406\u5bf9\u8c61\u6216\u6570\u7ec4\u7684\u60c5\u51b5\u4e0b\uff0c\u9700\u8981\u4f7f\u7528\u5c55\u5f00\u8bed\u6cd5\uff08{&#8230;}\uff09\u5c06\u5176\u5c55\u5f00\u5e76\u6dfb\u52a0\u66f4\u6539\u7684\u90e8\u5206\u8fdb\u884c\u63cf\u8ff0\u3002<br \/>\n\u5728useState\u7684\u60c5\u51b5\u4e0b\uff0c\u4f20\u9012\u7ed9\u66f4\u65b0\u51fd\u6570\u7684\u503c\u4e0d\u662f\u4e0e\u73b0\u6709\u72b6\u6001\u5408\u5e76\uff0c\u800c\u662f\u66ff\u6362\u4e3a\u4e00\u4e2a\u65b0\u7684\u72b6\u6001\uff0c\u56e0\u6b64\u9700\u8981\u5c55\u5f00\u539f\u59cb\u5bf9\u8c61\u6216\u6570\u7ec4\u4ee5\u4fdd\u7559\u5148\u524d\u7684\u72b6\u6001\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">obj<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setObj<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">({})<\/span>\r\n<span class=\"c1\">\/\/ \u5024\u306e\u66f4\u65b0<\/span>\r\n<span class=\"nf\">setObj<\/span><span class=\"p\">({...<\/span><span class=\"nx\">obj<\/span><span class=\"p\">,<\/span><span class=\"nx\">\u8ffd\u52a0\u3059\u308b\u5024<\/span><span class=\"p\">})<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">arr<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setArr<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">([])<\/span>\r\n<span class=\"c1\">\/\/ \u5024\u306e\u66f4\u65b0<\/span>\r\n<span class=\"nf\">setArr<\/span><span class=\"p\">([...<\/span><span class=\"nx\">arr<\/span><span class=\"p\">,<\/span><span class=\"nx\">\u8ffd\u52a0\u3059\u308b\u5024<\/span><span class=\"p\">])<\/span>\r\n<\/code><\/pre>\n<h2>\u4f7f\u7528useReducer<\/h2>\n<p>useReducer\u662f\u4e00\u4e2a\u7528\u4e8e\u7ba1\u7406\u7ec4\u4ef6\u72b6\u6001\u7684Hook\uff0c\u7c7b\u4f3c\u4e8euseState\u3002\u5b9e\u9645\u4e0a\uff0cuseState\u5728\u5185\u90e8\u662f\u57fa\u4e8euseReducer\u5b9e\u73b0\u7684\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">state<\/span><span class=\"p\">,<\/span> <span class=\"nx\">dispatch<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useReducer<\/span><span class=\"p\">(<\/span><span class=\"nx\">reducer<\/span><span class=\"p\">,<\/span><span class=\"nx\">\u521d\u671f\u5024<\/span><span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<p>state\u8868\u793a\u4e00\u4e2a\u72b6\u6001\u53d8\u91cf\uff0cstate\u7684\u66f4\u65b0\u51fd\u6570\u662freducer\u3002<br \/>\ndispatch\u662f\u8c03\u7528reducer\u7684\u51fd\u6570\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nf\">dispatch<\/span><span class=\"p\">(<\/span><span class=\"nx\">action<\/span><span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<p>\u901a\u8fc7\u5c06\u5bf9\u8c61\u884c\u52a8\uff08action\uff09\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u8c03\u5ea6\uff08dispatch\uff09\u6765\u8c03\u7528reducer\u51fd\u6570\uff0c\u4ee5\u89e6\u53d1\u66f4\u65b0\u529f\u80fd\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">reducer<\/span> <span class=\"o\">=<\/span> <span class=\"p\">(<\/span><span class=\"nx\">state<\/span><span class=\"p\">,<\/span> <span class=\"nx\">action<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"c1\">\/\/ action\u306b\u5fdc\u3058\u305f\u51e6\u7406\u5185\u5bb9<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"nx\">\u6b21\u306estate\u306e\u5024<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u4f20\u9012\u7ed9reducer\u7684\u53c2\u6570\u5305\u62ec\u8868\u793a\u7ec4\u4ef6\u72b6\u6001\u7684state\u548c\u901a\u8fc7dispatch\u4f20\u9012\u7684action\u5bf9\u8c61\u3002<br \/>\n\u53ef\u4ee5\u4f7f\u7528switch\u8bed\u53e5\u7b49\u6765\u7f16\u5199\u9488\u5bf9action\u4e2d\u6307\u5b9a\u5c5e\u6027\u7684\u5904\u7406\u3002<\/p>\n<h2>useState\u548cuseReducer\u7684\u5dee\u522b\u5728\u4e8e\u7528\u6cd5\u7684\u9009\u62e9\u3002<\/h2>\n<p>useState\u548cuseReducer\u5728\u66f4\u65b0\u72b6\u6001\u65b9\u9762\u5177\u6709\u76f8\u4f3c\u7684\u4f5c\u7528\u3002\u5728\u4ee5\u4e0b\u6761\u4ef6\u4e0b\uff0c\u4f7f\u7528\u5b83\u4eec\u80fd\u591f\u63d0\u9ad8\u53ef\u8bfb\u6027\u3002<\/p>\n<div>\n<div class=\"post-table\">\u9805\u76eeuseStateuseReducer\u6271\u3046\u30b9\u30c6\u30fc\u30c8\u306e\u578bNumber, String, BooleanObject, Array\u95a2\u9023\u3059\u308b\u30b9\u30c6\u30fc\u30c8\u3092\u6271\u3046\u00d7\u25ef\u30ed\u30fc\u30ab\u30ebor\u30b0\u30ed\u30fc\u30d0\u30eb\u30ed\u30fc\u30ab\u30eb\u30b0\u30ed\u30fc\u30d0\u30eb<br \/>\nuseContext()\u3068\u4f75\u7528\u3059\u308b<\/div>\n<\/div>\n<h2>\u4f7f\u7528useEffect<\/h2>\n<p>\u53ef\u4ee5\u6307\u5b9a\u5728DOM\u66f4\u65b0\u540e\u8981\u8c03\u7528\u7684\u5904\u7406\u7a0b\u5e8f\u7684Hook\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nf\">useEffect<\/span><span class=\"p\">(()<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span>\r\n              <span class=\"c1\">\/\/\u51e6\u7406\u5185\u5bb9<\/span>\r\n              <span class=\"p\">},[<\/span><span class=\"nx\">\u72b6\u614b\u5909\u5316\u3092\u76e3\u8996\u3059\u308b\u30b9\u30c6\u30fc\u30c8\u540d<\/span><span class=\"p\">])<\/span>\r\n<\/code><\/pre>\n<div>\u5f53DOM\u66f4\u65b0\u540e\u88ab\u8c03\u7528\uff0cuseEffect\u4f1a\u5c55\u793a\u9002\u5f53\u5730DOM\u66f4\u65b0\u5df2\u5b8c\u6210\u3002<\/div>\n<p>\u5982\u679c\u5728\u521d\u6b21\u6e32\u67d3\u65f6\u548c\u6307\u5b9a\u7684\u72b6\u6001\u5b58\u5728\u7684\u8bdd\uff0c\u6bcf\u6b21\u66f4\u65b0\u8be5\u72b6\u6001\u65f6\u90fd\u4f1a\u6267\u884c\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ \u30b9\u30c6\u30fc\u30c8\u306e\u8a2d\u5b9a<\/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\">useState<\/span><span class=\"p\">(<\/span><span class=\"mi\">0<\/span><span class=\"p\">)<\/span>\r\n<span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">value<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setValue<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">(<\/span><span class=\"dl\">''<\/span><span class=\"p\">)<\/span>\r\n\r\n<span class=\"c1\">\/\/ \u30da\u30fc\u30b8\u30bf\u30a4\u30c8\u30eb\u3092\u5909\u66f4<\/span>\r\n<span class=\"nf\">useEffect<\/span><span class=\"p\">(()<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span>\r\n              <span class=\"nb\">document<\/span><span class=\"p\">.<\/span><span class=\"nx\">title<\/span> <span class=\"o\">=<\/span> <span class=\"s2\">`{count}`<\/span>\r\n              <span class=\"p\">})<\/span>\r\n<\/code><\/pre>\n<p>\u5728\u9019\u7a2e\u60c5\u6cc1\u4e0b\uff0c\u7531\u65bc\u672a\u6307\u5b9a\u72c0\u614b\uff0cuseEffect\u5c07\u5728\u4ee5\u4e0b\u60c5\u6cc1\u4e0b\u57f7\u884c\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u521d\u56derender\u6642<\/ul>\n<\/li>\n<\/ul>\n<p>count\u304c\u66f4\u65b0\u3055\u308c\u305f\u6642<\/p>\n<p>value\u304c\u66f4\u65b0\u3055\u308c\u305f\u6642<\/p>\n<p>\u53ea\u9700\u5728count\u66f4\u65b0\u65f6\u89e6\u53d1useEffect\u5373\u53ef\uff0c\u5904\u7406\u5185\u5bb9\u65b9\u9762\u4e0d\u4f1a\u6709\u95ee\u9898\uff0c\u56e0\u6b64\u53ef\u4ee5\u4f7f\u7528\u6307\u5b9a\u7684\u72b6\u6001\u6765\u51cf\u5c11\u89e6\u53d1\u6b21\u6570\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">count<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setCount<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">(<\/span><span class=\"mi\">0<\/span><span class=\"p\">)<\/span>\r\n<span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">value<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setValue<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">(<\/span><span class=\"dl\">''<\/span><span class=\"p\">)<\/span>\r\n\r\n<span class=\"c1\">\/\/ \u30da\u30fc\u30b8\u30bf\u30a4\u30c8\u30eb\u3092\u5909\u66f4<\/span>\r\n<span class=\"nf\">useEffect<\/span><span class=\"p\">(()<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span>\r\n              <span class=\"nb\">document<\/span><span class=\"p\">.<\/span><span class=\"nx\">title<\/span> <span class=\"o\">=<\/span> <span class=\"s2\">`{count}`<\/span>\r\n              <span class=\"p\">},[<\/span><span class=\"nx\">count<\/span><span class=\"p\">])<\/span>\r\n<\/code><\/pre>\n<p>\u901a\u8fc7\u5728useEffect\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u6570\u7ec4\u4e2d\u6307\u5b9a\u8981\u76d1\u89c6\u7684\u72b6\u6001\uff0c\u53ea\u6709\u5f53\u8be5\u72b6\u6001\u66f4\u65b0\u65f6\u624d\u4f1a\u89e6\u53d1\uff0c\u5426\u5219\u4f1a\u88ab\u5ffd\u7565\u3002<br \/>\n\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0cuseEffect\u5c06\u5728\u4ee5\u4e0b\u60c5\u51b5\u4e0b\u6267\u884c\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u521d\u56derender\u6642<\/ul>\n<\/li>\n<\/ul>\n<p>count\u304c\u66f4\u65b0\u3055\u308c\u305f\u6642<\/p>\n<p>\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u5f53\u503c\u88ab\u66f4\u65b0\u65f6\uff0c\u53ef\u4ee5\u5ffd\u7565\u89e6\u53d1\u3002<\/p>\n<p>\u5982\u679c\u5c06\u7b2c\u4e8c\u4e2a\u53c2\u6570\u6307\u5b9a\u4e3a\u7a7a\u6570\u7ec4\uff08[]\uff09\uff0c\u5219\u53ef\u4ee5\u4f7f\u5904\u7406\u4ec5\u5728\u9996\u6b21\u6e32\u67d3\u65f6\u6267\u884c\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">count<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setCount<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">(<\/span><span class=\"mi\">0<\/span><span class=\"p\">)<\/span>\r\n<span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">value<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setValue<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">(<\/span><span class=\"dl\">''<\/span><span class=\"p\">)<\/span>\r\n\r\n<span class=\"c1\">\/\/ \u30da\u30fc\u30b8\u30bf\u30a4\u30c8\u30eb\u3092\u5909\u66f4<\/span>\r\n<span class=\"nf\">useEffect<\/span><span class=\"p\">(()<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span>\r\n              <span class=\"nb\">document<\/span><span class=\"p\">.<\/span><span class=\"nx\">title<\/span> <span class=\"o\">=<\/span> <span class=\"s2\">`{count}`<\/span>\r\n              <span class=\"p\">},[])<\/span>\r\n<\/code><\/pre>\n<p>\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u53ea\u6709\u5728\u7b2c\u4e00\u6b21\u6e32\u67d3\u65f6\u624d\u4f1a\u88ab\u89e6\u53d1\uff0c\u56e0\u6b64\u9875\u9762\u6807\u9898\u5c06\u4fdd\u6301\u4e3a0\u3002<\/p>\n<p>\u53ef\u4ee5\u901a\u8fc7\u5728useEffect\u4e2d\u8bbe\u7f6ereturn\u6765\u6307\u5b9a\u5728\u7ec4\u4ef6\u4eceDOM\u4e2d\u88ab\u5220\u9664\uff08\u5378\u8f7d\uff09\u65f6\u8981\u6267\u884c\u7684\u64cd\u4f5c\u51fd\u6570\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nf\">useEffect<\/span><span class=\"p\">(()<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span>\r\n              <span class=\"c1\">\/\/ \u30de\u30a6\u30b9\u304c\u52d5\u3044\u305f\u6642\u306e\u51e6\u7406\u3092\u8ffd\u52a0<\/span>\r\n              <span class=\"nb\">window<\/span><span class=\"p\">.<\/span><span class=\"nf\">addEventListener<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">mousemove<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span><span class=\"nx\">\u5b9f\u884c\u3055\u308c\u308b\u95a2\u6570<\/span><span class=\"p\">)<\/span>\r\n              <span class=\"k\">return <\/span><span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n                <span class=\"c1\">\/\/ \u30a2\u30f3\u30de\u30a6\u30f3\u30c8\u6642\u306b\u5b9f\u884c\u3055\u308c\u308b\u51e6\u7406<\/span>\r\n                <span class=\"c1\">\/\/ \u767b\u9332\u3057\u305f\u51e6\u7406\u3092\u524a\u9664<\/span>\r\n                <span class=\"nb\">window<\/span><span class=\"p\">.<\/span><span class=\"nf\">removeEventListener<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">mousemove<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span><span class=\"nx\">\u5b9f\u884c\u3055\u308c\u308b\u95a2\u6570<\/span><span class=\"p\">)<\/span>\r\n              <span class=\"p\">}<\/span>\r\n\r\n<span class=\"p\">})<\/span>\r\n<\/code><\/pre>\n<p>\u6613\u4e8e\u7406\u89e3\u7684\u6587\u7ae0<\/p>\n<p>&nbsp;<\/p>\n<h2>\u4f7f\u7528\u4e0a\u4e0b\u6587<\/h2>\n<p>\u4e00\u79cd\u53ef\u4ee5\u4e0d\u901a\u8fc7\u7236\u7ec4\u4ef6\u8fdb\u884c\u6570\u636e\u4f20\u9012\u800c\u76f4\u63a5\u64cd\u4f5c\u7ec4\u4ef6\u7684 Hook\u3002<\/p>\n<p>\u4e66\u5199\u65b9\u6cd5\u5982\u4e0b\u3002<\/p>\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=\"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\">ComponentC<\/span><span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">.\/component\/ComponentC<\/span><span class=\"dl\">'<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"kd\">const<\/span> <span class=\"nx\">UserContext<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">createContext<\/span><span class=\"p\">()<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"kd\">function<\/span> <span class=\"nf\">App<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">user<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setUser<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">({<\/span><span class=\"na\">name<\/span><span class=\"p\">:<\/span><span class=\"dl\">'<\/span><span class=\"s1\">yamada<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span><span class=\"na\">age<\/span><span class=\"p\">:<\/span><span class=\"mi\">32<\/span><span class=\"p\">})<\/span>\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"o\">&lt;<\/span><span class=\"nx\">div<\/span> <span class=\"nx\">className<\/span><span class=\"o\">=<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">App<\/span><span class=\"dl\">\"<\/span><span class=\"o\">&gt;<\/span>\r\n      <span class=\"o\">&lt;<\/span><span class=\"nx\">UserContext<\/span><span class=\"p\">.<\/span><span class=\"nx\">Provider<\/span> <span class=\"nx\">value<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span><span class=\"nx\">user<\/span><span class=\"p\">}<\/span><span class=\"o\">&gt;<\/span>\r\n        <span class=\"o\">&lt;<\/span><span class=\"nx\">ComponentC<\/span> <span class=\"o\">\/&gt;<\/span>\r\n      <span class=\"o\">&lt;<\/span><span class=\"sr\">\/UserContext.Provider<\/span><span class=\"err\">&gt;\r\n<\/span>    <span class=\"o\">&lt;<\/span><span class=\"sr\">\/div<\/span><span class=\"err\">&gt;\r\n<\/span>  <span class=\"p\">);<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5c06\u8981\u4f20\u9012\u7684\u7ec4\u4ef6\u521b\u5efa\u5728Context\u7684Provider\u4e2d\uff0c\u5373UserContext.Provider\u3002<br \/>\n\u540c\u65f6\uff0c\u5c06\u8981\u4f20\u9012\u7684\u53d8\u91cf\u4f5c\u4e3avalue\u4f20\u9012\u3002<br \/>\n\u4e3a\u4e86\u5728\u5176\u4ed6\u6587\u4ef6\u4e2d\u4f7f\u7528\u8be5Context\uff0c\u9700\u8981\u8fdb\u884c\u5bfc\u51fa\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\">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\">UserContext<\/span><span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">..\/App<\/span><span class=\"dl\">'<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"kd\">function<\/span> <span class=\"nf\">ComponentF<\/span><span class=\"p\">(){<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">user<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useContext<\/span><span class=\"p\">(<\/span><span class=\"nx\">UserContext<\/span><span class=\"p\">)<\/span>\r\n   <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n     <span class=\"o\">&lt;<\/span><span class=\"nx\">div<\/span><span class=\"o\">&gt;<\/span>\r\n      <span class=\"p\">{<\/span><span class=\"nx\">user<\/span><span class=\"p\">.<\/span><span class=\"nx\">name<\/span><span class=\"p\">}<\/span>\r\n      <span class=\"o\">&lt;<\/span><span class=\"sr\">\/div<\/span><span class=\"err\">&gt;\r\n<\/span>   <span class=\"p\">)<\/span>  \r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5047\u8bbeComponentF\u5305\u542b\u5728ComponentC\u4e2d\u3002<\/p>\n<p>\u53ef\u4ee5\u4f7f\u7528useContext\u63a5\u6536\u4f20\u9012\u7684Context\u5e76\u5c06\u5176\u5b58\u50a8\u5728\u53d8\u91cf\u4e2d\u3002<br \/>\n\u4e4b\u540e\u53ef\u4ee5\u5728\u8be5\u8303\u56f4\u5185\u4f7f\u7528\u53d8\u91cf\u6765\u8bbf\u95ee\u503c\u3002<\/p>\n<h2>\u4f7f\u7528useRef<\/h2>\n<p>\u6267\u884c\u5bf9\u8981\u7d20\u7684\u5f15\u7528\u7684\u94a9\u5b50\u3002<\/p>\n<div>\u53ef\u4ee5\u50cf\u4f7f\u7528useState\u4e00\u6837\uff0c\u7528\u4e8e\u4fdd\u6301\u503c\uff0c\u4f46\u4e0euseState\u4e0d\u540c\u7684\u662f\uff0c\u5373\u4f7f\u503c\u88ab\u66f4\u65b0\uff0c\u4e5f\u4e0d\u4f1a\u89e6\u53d1\u91cd\u65b0\u6e32\u67d3\u3002<\/div>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">ref<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useRef<\/span><span class=\"p\">(<\/span><span class=\"nx\">\u521d\u671f\u5024<\/span><span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<p>\u5728\u4f7f\u7528 useRef \u65f6\uff0c\u9700\u8981\u5728\u7ec4\u4ef6\u7684\u9876\u5c42\u8c03\u7528\u5e76\u58f0\u660e\u53d8\u91cf\u3002<br \/>\n\u5b83\u8fd4\u56de\u4e00\u4e2a\u5177\u6709\u521d\u59cb\u503c\u7684\u5bf9\u8c61\uff0c\u8be5\u5bf9\u8c61\u5177\u6709\u4e00\u4e2a current \u5c5e\u6027\u3002<br \/>\n\u4e3b\u8981\u7528\u4e8e\u5f15\u7528\u503c\u6216\u8fdb\u884c DOM \u64cd\u4f5c\u3002<\/p>\n<h3>\u5f53\u9700\u8981\u5f15\u7528\u4e00\u4e2a\u6570\u503c\u65f6<\/h3>\n<p>\u53ef\u4ee5\u4f7f\u7528useRef\u6765\u5b9a\u4e49\u8981\u53c2\u7167\u7684\u503c\uff0c\u5e76\u901a\u8fc7\u6307\u5b9acurrent\u5c5e\u6027\u8fdb\u884c\u91cd\u65b0\u8d4b\u503c\u6765\u66f4\u65b0\u503c\uff0c\u4ece\u800c\u4fdd\u6301\u6e32\u67d3\u4e0d\u53d8\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ \u53c2\u7167\u3057\u305f\u3044\u5024\u306e\u5b9a\u7fa9<\/span>\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">count<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useRef<\/span><span class=\"p\">(<\/span><span class=\"mi\">0<\/span><span class=\"p\">)<\/span>\r\n\r\n<span class=\"c1\">\/\/ \u5024\u306e\u66f4\u65b0<\/span>\r\n<span class=\"nx\">count<\/span><span class=\"p\">.<\/span><span class=\"nx\">current<\/span>  <span class=\"o\">=<\/span> <span class=\"mi\">1<\/span>\r\n<\/code><\/pre>\n<h3>\u8fdb\u884cDOM\u64cd\u4f5c<\/h3>\n<p>\u5c06\u5b9a\u4e49\u5728JSX\u4e2d\u7684ref\u5bf9\u8c61\u4f20\u9012\u7ed9\u60f3\u8981\u64cd\u4f5c\u7684DOM\u8282\u70b9\u3002<br \/>\n\u4f20\u9012\u7684DOM\u8282\u70b9\u5c06\u88ab\u5b58\u50a8\u5728current\u5c5e\u6027\u4e2d\uff0c\u56e0\u6b64\u53ef\u4ee5\u4f7f\u7528current\u5c5e\u6027\u6765\u8fdb\u884c\u5e38\u89c4\u7684DOM\u64cd\u4f5c\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ useRef\u306e\u5b9a\u7fa9<\/span>\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">inputDom<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useRef<\/span><span class=\"p\">(<\/span><span class=\"kc\">null<\/span><span class=\"p\">)<\/span>\r\n\r\n<span class=\"c1\">\/\/ DOM\u306e\u6307\u5b9a\uff08JSX\u5185\uff09<\/span>\r\n<span class=\"k\">return<\/span> <span class=\"o\">&lt;<\/span><span class=\"nx\">input<\/span> <span class=\"nx\">ref<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span><span class=\"nx\">inputDom<\/span><span class=\"p\">}<\/span> <span class=\"sr\">\/<\/span><span class=\"err\">&gt;\r\n<\/span>\r\n<span class=\"c1\">\/\/ DOM\u306e\u64cd\u4f5c\uff08\u5165\u529b\u6b04\u306b\u30d5\u30a9\u30fc\u30ab\u30b9\u3059\u308b\uff09<\/span>\r\n<span class=\"nx\">inputDom<\/span><span class=\"p\">.<\/span><span class=\"nx\">current<\/span><span class=\"p\">.<\/span><span class=\"nf\">focus<\/span><span class=\"p\">()<\/span>\r\n<\/code><\/pre>\n<h1>\u6709\u52a9\u4e8e\u63d0\u9ad8\u8868\u73b0\u7684Hook<\/h1>\n<h2>\u4f7f\u7528\u56de\u8c03\u51fd\u6570<\/h2>\n<h2>\u4f7f\u7528useMemo<\/h2>\n","protected":false},"excerpt":{"rendered":"<p>React \u662f\u4ec0\u4e48 Meta\u5f00\u53d1\u7684JavaScript\u5e93 \u6709\u4ee5\u4e0b3\u4e2a\u7279\u70b9\u3002 Declarative(\u5ba3\u8a00\u7684)  [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-38047","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>\u56de\u5e94\u7684\u5907\u5fd8\u5f55 - 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\/\u56de\u5e94\u7684\u5907\u5fd8\u5f55\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta 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