{"id":38452,"date":"2023-12-07T16:38:20","date_gmt":"2023-05-19T13:57:27","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/2023%e5%b9%b4%e4%b8%ad%e9%87%8d%e6%96%b0%e7%86%9f%e6%82%89%e4%b8%80%e4%b8%8buseref%e7%9a%84%e4%bd%bf%e7%94%a8\/"},"modified":"2024-05-04T12:32:28","modified_gmt":"2024-05-04T04:32:28","slug":"2023%e5%b9%b4%e4%b8%ad%e9%87%8d%e6%96%b0%e7%86%9f%e6%82%89%e4%b8%80%e4%b8%8buseref%e7%9a%84%e4%bd%bf%e7%94%a8","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/2023%e5%b9%b4%e4%b8%ad%e9%87%8d%e6%96%b0%e7%86%9f%e6%82%89%e4%b8%80%e4%b8%8buseref%e7%9a%84%e4%bd%bf%e7%94%a8\/","title":{"rendered":"2023\u5e74\u4e2d\u91cd\u65b0\u719f\u6089\u4e00\u4e0buseRef\u7684\u4f7f\u7528"},"content":{"rendered":"<p>\u4f60\u597d\uff01\u6211\u662f\u682a\u5f0f\u4f1a\u793e\u30a8\u30a4\u30c1\u30fc\u30e0\u30e9\u30a4\u30d5\u30c7\u30b6\u30a4\u30f3\u7684 @TMDM\u3002<br \/>\n\u8fd9\u7bc7\u6587\u7ae0\u662fAteam LifeDesign Advent Calendar 2023\u7cfb\u52171\u7684\u7b2c9\u5929\u7684\u6587\u7ae0\u3002<\/p>\n<h1>\u6df1\u5165\u7406\u89e3useRef\u7684\u6982\u5ff5<\/h1>\n<p>\u4f7f\u7528useRef\u4e3b\u8981\u6709\u4e24\u79cd\u7528\u9014\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">DOM\u8981\u7d20\u3078\u306e\u53c2\u7167<\/ul>\n<\/li>\n<\/ul>\n<p>React\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5185\u306e\u7279\u5b9a\u306eDOM\u8981\u7d20\u306b\u53c2\u7167\u3067\u304d\u307e\u3059\u3002\u53c2\u7167\u3055\u308c\u305fDOM\u306fuseRef\u3067\u64cd\u4f5c\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<p>\u30c7\u30fc\u30bf\u306e\u4fdd\u6301<\/p>\n<p>\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u9593\u3067\u3001\u30c7\u30fc\u30bf\u3092\u4fdd\u6301\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<br \/>\nuseState\u3068\u306f\u9055\u3063\u3066\u3001\u5024\u304c\u5909\u308f\u3063\u3066\u3082\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u307e\u305b\u3093\u3002<\/p>\n<p>\u8003\u8651\u5230\u4e0a\u8ff0\u5185\u5bb9\uff0c\u6211\u4eec\u5c06\u5b9e\u9645\u64cd\u4f5c\u5e76\u9010\u6b65\u7406\u89e3\u5b98\u65b9\u7684\u5185\u5bb9\u3002<\/p>\n<hr \/>\n<h1>\u4f7f\u7528useRef<\/h1>\n<blockquote><p>\u8fd9\u662f\u4e00\u4e2a\u7528\u4e8e\u5728\u6e32\u67d3\u65f6\u5f15\u7528\u4e0d\u9700\u8981\u7684\u503c\u7684 React \u94a9\u5b50\u3002<\/p><\/blockquote>\n<ul class=\"post-ul\">useRef\u306b\u5024\u3092\u4fdd\u6301\u3055\u305b\u3066\u3044\u3066\u3082\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306b\u76f4\u63a5\u5f71\u97ff\u3092\u3057\u307e\u305b\u3093\u3088\uff01\u3068\u3044\u3046\u3053\u3068\u3002<\/ul>\n<h3>\u4f7f\u7528\u65b9\u6cd5: \u5229\u7528\u8fd9\u4e2a\u65b9\u6cd5\u8fdb\u884c\u64cd\u4f5c\u3002<\/h3>\n<p>\u548c\u5176\u4ed6\u7684hooks\u4e00\u6837\uff0c\u8be5\u51fd\u6570\u9700\u8981\u5728\u9876\u5c42\u8c03\u7528\u5e76\u4f7f\u7528\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">useRef<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">react<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">hoge<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span><span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">inputRef<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useRef<\/span><span class=\"p\">(<\/span><span class=\"kc\">null<\/span><span class=\"p\">)<\/span> <span class=\"c1\">\/\/ \u5f15\u6570\u306b\u521d\u671f\u5024<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h3>\u53c2\u6570<\/h3>\n<p>\u5728\u4e2d\u6587\u4e2d\uff0c\u4f7f\u7528useRef(\u53c2\u6570)\u4f5c\u4e3acurrent\u5c5e\u6027\u7684\u521d\u59cb\u503c\u3002<br \/>\n\u5728\u7b2c\u4e8c\u6b21\u53ca\u4ee5\u540e\u7684\u6e32\u67d3\u4e2d\u5c06\u88ab\u5ffd\u7565\uff0c\u5e76\u8fd4\u56de\u76f8\u540c\u7684\u5bf9\u8c61\u3002<\/p>\n<h5>\u6ce8\u610f\u4e8b\u9879<\/h5>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">ref.current\u306f\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u66f8\u304d\u63db\u3048\u304c\u53ef\u80fd\u3002(state\u306e\u4e00\u90e8\u3092\u6301\u3063\u3066\u3044\u308b\u5834\u5408\u306f\u5909\u66f4\u3059\u3079\u304d\u3067\u306f\u306a\u3044\u3002)<\/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\">ref.current\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u5909\u66f4\u3055\u308c\u3066\u3082\u3001React\u306f\u518d\u30ec\u30f3\u30c0\u30fc\u3057\u307e\u305b\u3093\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u30ec\u30f3\u30c0\u30fc\u4e2d\u306bref.current\u306e\u5024\u3092\u8aad\u3093\u3060\u308a\u66f8\u304d\u8fbc\u3093\u3060\u308a\u306f\u3057\u3066\u306f\u3044\u3051\u306a\u3044\u3002\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u632f\u308b\u821e\u3044\u304c\u4e88\u6e2c\u4e0d\u53ef\u80fd\u306b\u306a\u308b(useState\u4f7f\u304a\u3046)<\/ul>\n<h2>\u4f7f\u7528ref\u5173\u952e\u5b57\u5f15\u7528\u503c<\/h2>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">useRef<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">react<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">hoge<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span><span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">intervalRef<\/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  <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nf\">log<\/span><span class=\"p\">(<\/span><span class=\"nx\">intervalRef<\/span><span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<p>useRef\u53ea\u6709\u4e00\u4e2a\u5c5e\u6027\uff1acurrent\uff01current\u7684\u65e5\u672c\u8bed\u7ffb\u8bd1\u662f\u8fd9\u6837\u7684\uff1a\u6307\u5b9a\u7684\u521d\u59cb\u503c\u5c06\u8fd4\u56de\u8bbe\u7f6e\u7684ref\u72b6\u6001\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d341837434c4406c67e2d\/19-0.png\" alt=\"SS.png\" \/><\/div>\n<h4>\u518d\u6e32\u67d3\u4e0d\u4f1a\u88ab\u89e6\u53d1\u3002<\/h4>\n<p>\u5373\u4f7f\u66f4\u6539\u4e86ref\uff0c\u4e5f\u4e0d\u4f1a\u89e6\u53d1\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<p>\u771f\u7684\u5417\uff1f\u6211\u5c06\u5c1d\u8bd5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\u8fdb\u884c\u786e\u8ba4\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">FC<\/span><span class=\"p\">,<\/span> <span class=\"nx\">useEffect<\/span><span class=\"p\">,<\/span> <span class=\"nx\">useRef<\/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\r\n<span class=\"k\">export<\/span> <span class=\"kd\">const<\/span> <span class=\"nx\">Test<\/span><span class=\"p\">:<\/span> <span class=\"nx\">FC<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">intervalRef<\/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  <span class=\"kd\">const<\/span> <span class=\"nx\">handleClick<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nx\">intervalRef<\/span><span class=\"p\">.<\/span><span class=\"nx\">current<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">intervalRef<\/span><span class=\"p\">.<\/span><span class=\"nx\">current<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">1<\/span>\r\n    <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nf\">log<\/span><span class=\"p\">(<\/span><span class=\"nx\">intervalRef<\/span><span class=\"p\">.<\/span><span class=\"nx\">current<\/span><span class=\"p\">)<\/span>\r\n  <span class=\"p\">}<\/span>\r\n  <span class=\"nf\">useEffect<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nf\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">hello<\/span><span class=\"dl\">'<\/span><span class=\"p\">)<\/span>\r\n  <span class=\"p\">})<\/span>\r\n\r\n  <span class=\"k\">return<\/span> <span class=\"p\">&lt;<\/span><span class=\"nt\">button<\/span> <span class=\"na\">onClick<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">handleClick<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>\u30af\u30ea\u30c3\u30af<span class=\"p\">&lt;\/<\/span><span class=\"nt\">button<\/span><span class=\"p\">&gt;<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d341837434c4406c67e2d\/24-0.png\" alt=\"SS.png\" \/><\/div>\n<p>\u4f60\u597d\u53ea\u51fa\u73b0\u4e86\u4e00\u6b21\u5e76\u6ca1\u6709\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<h4>\u53ef\u4ee5\u8de8\u8d8a\u6e32\u67d3\u5668\u4fdd\u5b58\u4fe1\u606f<\/h4>\n<p>ref\u975e\u5e38\u9002\u5408\u4fdd\u5b58\u4e0d\u4f1a\u5f71\u54cd\u8f93\u51fa\u7ec4\u4ef6\u5916\u89c2\u7684\u6570\u636e\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ useState\u3068\u7d44\u307f\u5408\u308f\u305b\u3066\u307f\u308b\u3002<\/span>\r\n<span class=\"c1\">\/\/ useRef\u306e\u5024\u304c\u5897\u3048\u3066\u3082\u30ec\u30f3\u30c0\u30fc\u3055\u308c\u306a\u3044\u3002<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">FC<\/span><span class=\"p\">,<\/span> <span class=\"nx\">useEffect<\/span><span class=\"p\">,<\/span> <span class=\"nx\">useState<\/span><span class=\"p\">,<\/span> <span class=\"nx\">useRef<\/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\r\n<span class=\"k\">export<\/span> <span class=\"kd\">const<\/span> <span class=\"nx\">Kv<\/span><span class=\"p\">:<\/span> <span class=\"nx\">FC<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">intervalRef<\/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  <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=\"nx\">handleClick<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nf\">setCount<\/span><span class=\"p\">((<\/span><span class=\"nx\">c<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">c<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nf\">log<\/span><span class=\"p\">(<\/span><span class=\"nx\">count<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nf\">log<\/span><span class=\"p\">(<\/span><span class=\"nx\">intervalRef<\/span><span class=\"p\">.<\/span><span class=\"nx\">current<\/span><span class=\"p\">)<\/span>\r\n  <span class=\"p\">}<\/span>\r\n  <span class=\"nf\">setInterval<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nx\">intervalRef<\/span><span class=\"p\">.<\/span><span class=\"nx\">current<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">intervalRef<\/span><span class=\"p\">.<\/span><span class=\"nx\">current<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">1<\/span>\r\n  <span class=\"p\">},<\/span> <span class=\"mi\">500<\/span><span class=\"p\">)<\/span> <span class=\"c1\">\/\/ \u5185\u90e8\u3067useRef\u306e\u30ab\u30a6\u30f3\u30c8\u3060\u3051\u3069\u3093\u3069\u3093\u9032\u3080<\/span>\r\n\r\n  <span class=\"nf\">useEffect<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nf\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">hello<\/span><span class=\"dl\">'<\/span><span class=\"p\">)<\/span>\r\n  <span class=\"p\">})<\/span>\r\n\r\n  <span class=\"k\">return<\/span> <span class=\"p\">&lt;<\/span><span class=\"nt\">button<\/span> <span class=\"na\">onClick<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">handleClick<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>\u30af\u30ea\u30c3\u30af<span class=\"p\">&lt;\/<\/span><span class=\"nt\">button<\/span><span class=\"p\">&gt;<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d341837434c4406c67e2d\/29-0.png\" alt=\"SS.png\" \/><\/div>\n<p>\u5f53\u524d\u7684\u503c\u6bcf0.5\u79d2\u4e0d\u65ad\u589e\u52a0\uff0c\u4f46hello\u5e76\u4e0d\u9891\u7e41\u51fa\u73b0\uff01<\/p>\n<h1>\u5728 JavaScript \u4e2d\u4f7f\u7528 ref \u64cd\u4f5c DOM<\/h1>\n<p>\u5f53\u70b9\u51fb\u805a\u7126\u6309\u94ae\u65f6\uff0c\u4f1a\u4f7finput\u6807\u7b7e\u83b7\u5f97\u7126\u70b9\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d341837434c4406c67e2d\/33-0.png\" alt=\"undefined\" \/><\/div>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"nx\">React<\/span> <span class=\"p\">,{<\/span><span class=\"nx\">useRef<\/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\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">Sample<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">inputRef<\/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  <span class=\"kd\">const<\/span> <span class=\"nx\">handleFocus<\/span> <span class=\"o\">=<\/span><span class=\"p\">()<\/span><span class=\"o\">=&gt;<\/span><span class=\"p\">{<\/span>\r\n    <span class=\"nx\">inputRef<\/span><span class=\"p\">.<\/span><span class=\"nx\">current<\/span><span class=\"p\">.<\/span><span class=\"nf\">focus<\/span><span class=\"p\">()<\/span> <span class=\"c1\">\/\/ inputRef\u306b\u30d5\u30a9\u30fc\u30ab\u30b9\u3057\u3066<\/span>\r\n  <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=\"nt\">label<\/span><span class=\"p\">&gt;<\/span>\r\n        <span class=\"p\">&lt;<\/span><span class=\"nt\">input<\/span> <span class=\"na\">type<\/span><span class=\"p\">=<\/span><span class=\"s\">\"text\"<\/span> <span class=\"na\">ref<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">inputRef<\/span><span class=\"si\">}<\/span> <span class=\"p\">\/&gt;<\/span>\r\n        <span class=\"p\">&lt;<\/span><span class=\"nt\">button<\/span> <span class=\"na\">onClick<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">handleFocus<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>\u30d5\u30a9\u30fc\u30ab\u30b9\u30dc\u30bf\u30f3<span class=\"p\">&lt;\/<\/span><span class=\"nt\">button<\/span><span class=\"p\">&gt;<\/span>\r\n      <span class=\"p\">&lt;\/<\/span><span class=\"nt\">label<\/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=\"k\">export<\/span> <span class=\"k\">default<\/span> <span class=\"nx\">Sample<\/span>\r\n<\/code><\/pre>\n<h4>\u5982\u679c\u5e0c\u671b\u4f20\u9012\u7ed9\u7ec4\u4ef6\u7684\u662f ref\uff0c\u53ef\u4ee5\u4f7f\u7528 forwardRef \u6765\u4f20\u9012\u3002<\/h4>\n<p>\u6709\u65f6\u5019\u6211\u4eec\u9700\u8981\u901a\u8fc7ref\u6765\u64cd\u7eb5\u5b50\u7ec4\u4ef6\u7684\u5143\u7d20\uff0c\u5bf9\u5427\uff1f<\/p>\n<p>\u7531\u4e8e\u76f4\u63a5\u7236\u7ec4\u4ef6\u65e0\u6cd5\u8bbf\u95ee\u5176\u5b50\u7ec4\u4ef6\u7684input\uff0c\u5e76\u4e14ref\u88ab\u5904\u7406\u5f97\u4e0e\u666e\u901aprops\u4e0d\u540c\uff0c\u56e0\u6b64\u65e0\u6cd5\u4f7f\u7528props\u3002\u56e0\u6b64\uff0c\u60a8\u9700\u8981\u4f7f\u7528forwardRef\u6765\u5c06ref\u4f20\u9012\u7ed9\u5b50\u7ec4\u4ef6\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d341837434c4406c67e2d\/38-0.png\" alt=\"undefined\" \/><\/div>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"nx\">React<\/span> <span class=\"p\">,{<\/span><span class=\"nx\">useRef<\/span><span class=\"p\">,<\/span><span class=\"nx\">forwardRef<\/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\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">MyInput<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">forwardRef<\/span><span class=\"p\">((<\/span><span class=\"nx\">props<\/span><span class=\"p\">,<\/span> <span class=\"nx\">ref<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span> <span class=\"c1\">\/\/ \u5fc5\u305a\u3053\u306e\u9806\u5e8f(props, ref)\u3067\u6e21\u3057\u307e\u3059<\/span>\r\n  <span class=\"k\">return<\/span> <span class=\"p\">&lt;<\/span><span class=\"nt\">div<\/span><span class=\"p\">&gt;<\/span>forwardRef<span class=\"p\">&lt;<\/span><span class=\"nt\">br<\/span><span class=\"p\">\/&gt;&lt;<\/span><span class=\"nt\">input<\/span> <span class=\"si\">{<\/span><span class=\"p\">...<\/span><span class=\"nx\">props<\/span><span class=\"si\">}<\/span> <span class=\"na\">ref<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">ref<\/span><span class=\"si\">}<\/span> <span class=\"p\">\/&gt;&lt;\/<\/span><span class=\"nt\">div<\/span><span class=\"p\">&gt;<\/span>\r\n<span class=\"p\">});<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">Sample<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">inputRef<\/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  <span class=\"kd\">const<\/span> <span class=\"nx\">handleFocus<\/span> <span class=\"o\">=<\/span><span class=\"p\">()<\/span><span class=\"o\">=&gt;<\/span><span class=\"p\">{<\/span>\r\n    <span class=\"nx\">inputRef<\/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  <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=\"nt\">label<\/span><span class=\"p\">&gt;<\/span>\r\n        <span class=\"p\">&lt;<\/span><span class=\"nc\">MyInput<\/span> <span class=\"na\">ref<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">inputRef<\/span><span class=\"si\">}<\/span> <span class=\"p\">\/&gt;<\/span>\r\n        <span class=\"p\">&lt;<\/span><span class=\"nt\">button<\/span> <span class=\"na\">onClick<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">handleFocus<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>\u30d5\u30a9\u30fc\u30ab\u30b9\u30dc\u30bf\u30f3<span class=\"p\">&lt;\/<\/span><span class=\"nt\">button<\/span><span class=\"p\">&gt;<\/span>\r\n      <span class=\"p\">&lt;\/<\/span><span class=\"nt\">label<\/span><span class=\"p\">&gt;<\/span>\r\n    <span class=\"p\">&lt;\/<\/span><span class=\"nt\">div<\/span><span class=\"p\">&gt;<\/span>\r\n  <span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"k\">default<\/span> <span class=\"nx\">Sample<\/span>\r\n<\/code><\/pre>\n<p>forwardRef\u5c31\u50cf\u662f\u95e8\u53e3\u4e00\u6837\u3002<br \/>\nforwardRef\u53ef\u4ee5\u88ab\u89c6\u4e3a\u63d0\u4f9b\u7ed9\u7236\u7ec4\u4ef6\u7684\u4e00\u79cd\u201c\u8fdb\u5165\u53e3\u201d\uff0c\u4ee5\u65b9\u4fbf\u8bbf\u95ee\u5176\u5185\u90e8\u3002<\/p>\n<h2>\u9632\u6b62\u91cd\u65b0\u751f\u6210ref\u7684\u503c\u3002<\/h2>\n<p>useRef\u7528\u4e8e\u4fdd\u5b58\u4f20\u5165\u7684ref\u503c\uff0c\u4f46\u6bcf\u6b21\u6e32\u67d3\u65f6\u90fd\u4f1a\u53d1\u751f\u8c03\u7528\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">playerRef<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useRef<\/span><span class=\"p\">(<\/span><span class=\"k\">new<\/span> <span class=\"nf\">\u91cd\u3044\u51e6\u7406<\/span><span class=\"p\">());<\/span> <span class=\"c1\">\/\/ \u30ec\u30f3\u30c0\u30fc\u306e\u305f\u3073\u306b\u7121\u99c4\u304c\u591a\u3044...<\/span>\r\n<\/code><\/pre>\n<p>\u56e0\u6b64\uff0c\u5efa\u8bae\u8fdb\u884c\u521d\u59cb\u5316\u3002<\/p>\n<pre class=\"post-pre\"><code>  <span class=\"kd\">const<\/span> <span class=\"nx\">playerRef<\/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  <span class=\"k\">if <\/span><span class=\"p\">(<\/span><span class=\"nx\">playerRef<\/span><span class=\"p\">.<\/span><span class=\"nx\">current<\/span> <span class=\"o\">===<\/span> <span class=\"kc\">null<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nx\">playerRef<\/span><span class=\"p\">.<\/span><span class=\"nx\">current<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nf\">\u91cd\u3044\u51e6\u7406<\/span><span class=\"p\">();<\/span> <span class=\"c1\">\/\/ \u521d\u56de\u30ec\u30f3\u30c0\u30fc\u3060\u3051\u3001\u91cd\u3044\u51e6\u7406\u3092new\u3059\u308b\u3002<\/span>\r\n  <span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<hr \/>\n<p>\u9664\u4e86\u516c\u5f0f\u4ee5\u5916\uff0c\u8fd8\u4ecb\u7ecd\u4e86\u4e00\u79cd\u5229\u7528useRef\u7684\u6280\u5de7\u3002\u4f7f\u7528React \u00d7 IntersectionObserver\u6765\u5b9e\u73b0\u4e09\u4e2a\u5f3a\u5927\u7684\u529f\u80fd\uff01<\/p>\n<ul class=\"post-ul\">\u5e83\u544a\u306e\u8868\u793a\u7387\u8a08\u6e2c : \u30b3\u30f3\u30c6\u30f3\u30c4\u4f5c\u3063\u305f\u3051\u3069\u3001\u30e6\u30fc\u30b6\u30fc\u306b\u3069\u308c\u304f\u3089\u3044\u523a\u3055\u3055\u3063\u3066\u3044\u308b\u306e\u304b\uff1f\u3092\u8a08\u6e2c\u3057\u305f\u3044\u3068\u304d\u306b\u826f\u3055\u305d\u3046\u3067\u3059\u306d\u3002<\/ul>\n<h2>\u7ed3\u675f<\/h2>\n<p>\u8f9b\u82e6\u4e86\uff01useRef\u53ef\u4ee5\u8fdb\u884c\u547d\u4ee4\u5f0f\u64cd\u4f5c\u3002\u8fd9\u4e0eReact\u7684\u58f0\u660e\u5f0f\u8303\u5f0f\u6709\u70b9\u4e0d\u540c\u3002\u867d\u7136\u975e\u5e38\u65b9\u4fbf\uff0c\u4f46\u5728\u4f7f\u7528\u65f6\u9700\u8981\u8c28\u614e\u3002\u6211\u4eec\u5e94\u8be5\u7ecf\u5e38\u601d\u8003\u201c\u8fd9\u6837\u505a\u771f\u7684\u597d\u5417\uff1f\u201d\u201c\u662f\u5426\u6709\u66f4\u597d\u7684\u65b9\u6cd5\uff1f\u201d<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4f60\u597d\uff01\u6211\u662f\u682a\u5f0f\u4f1a\u793e\u30a8\u30a4\u30c1\u30fc\u30e0\u30e9\u30a4\u30d5\u30c7\u30b6\u30a4\u30f3\u7684 @TMDM\u3002 \u8fd9\u7bc7\u6587\u7ae0\u662fAteam LifeDesign Adv [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-38452","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>2023\u5e74\u4e2d\u91cd\u65b0\u719f\u6089\u4e00\u4e0buseRef\u7684\u4f7f\u7528 - 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\/2023\u5e74\u4e2d\u91cd\u65b0\u719f\u6089\u4e00\u4e0buseref\u7684\u4f7f\u7528\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"2023\u5e74\u4e2d\u91cd\u65b0\u719f\u6089\u4e00\u4e0buseRef\u7684\u4f7f\u7528\" \/>\n<meta property=\"og:description\" content=\"\u4f60\u597d\uff01\u6211\u662f\u682a\u5f0f\u4f1a\u793e\u30a8\u30a4\u30c1\u30fc\u30e0\u30e9\u30a4\u30d5\u30c7\u30b6\u30a4\u30f3\u7684 @TMDM\u3002 \u8fd9\u7bc7\u6587\u7ae0\u662fAteam LifeDesign Adv [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/2023\u5e74\u4e2d\u91cd\u65b0\u719f\u6089\u4e00\u4e0buseref\u7684\u4f7f\u7528\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2023-05-19T13:57:27+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-05-04T04:32:28+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d341837434c4406c67e2d\/19-0.png\" \/>\n<meta name=\"author\" content=\"\u6e05, \u5b87\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u6e05, \u5b87\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/2023%e5%b9%b4%e4%b8%ad%e9%87%8d%e6%96%b0%e7%86%9f%e6%82%89%e4%b8%80%e4%b8%8buseref%e7%9a%84%e4%bd%bf%e7%94%a8\/\",\"url\":\"https:\/\/www.silicloud.com\/zh\/blog\/2023%e5%b9%b4%e4%b8%ad%e9%87%8d%e6%96%b0%e7%86%9f%e6%82%89%e4%b8%80%e4%b8%8buseref%e7%9a%84%e4%bd%bf%e7%94%a8\/\",\"name\":\"2023\u5e74\u4e2d\u91cd\u65b0\u719f\u6089\u4e00\u4e0buseRef\u7684\u4f7f\u7528 - Blog - Silicon 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