{"id":38385,"date":"2022-12-05T20:06:44","date_gmt":"2024-01-08T23:36:10","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90reacttypescript%e3%80%91%e7%a4%ba%e4%be%8b%ef%bc%9areact-hooks-useimperativehandle\/"},"modified":"2024-04-29T03:52:54","modified_gmt":"2024-04-28T19:52:54","slug":"%e3%80%90reacttypescript%e3%80%91%e7%a4%ba%e4%be%8b%ef%bc%9areact-hooks-useimperativehandle","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90reacttypescript%e3%80%91%e7%a4%ba%e4%be%8b%ef%bc%9areact-hooks-useimperativehandle\/","title":{"rendered":"\u3010React+TypeScript\u3011\u793a\u4f8b\uff1aReact Hooks useImperativeHandle"},"content":{"rendered":"<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d344e37434c4406c687fa\/0-0.png\" alt=\"React+TypeScript.png\" \/><\/div>\n<p>\u5728TypeScript\u4e2d\u4f7f\u7528useImperativeHandle\u7684\u793a\u4f8b\u3002<\/p>\n<p>\u5728\u8c03\u7528\u5b50\u7ec4\u4ef6\u4e2d\u5b9a\u4e49\u7684\u65b9\u6cd5\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u7236\u7ec4\u4ef6\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\">useRef<\/span><span class=\"p\">,<\/span> <span class=\"nx\">useImperativeHandle<\/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=\"s2\">react<\/span><span class=\"dl\">\"<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"c1\">\/\/ \u516c\u958b\u3057\u305f\u3044\u30e1\u30bd\u30c3\u30c9\u306e\u5b9a\u7fa9<\/span>\r\n<span class=\"kr\">interface<\/span> <span class=\"nx\">Handler<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"nx\">setFocus<\/span><span class=\"p\">():<\/span> <span class=\"k\">void<\/span><span class=\"p\">;<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"c1\">\/\/ \u516c\u958b\u3057\u305f\u3044\u30e1\u30bd\u30c3\u30c9\u3092\u6301\u3064\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u5b9a\u7fa9<\/span>\r\n<span class=\"c1\">\/\/ \u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u8ffd\u52a0\u3059\u308b\u5834\u5408\u306f\u3001forwardRef&lt;Handler, Props&gt;\u3068\u5b9a\u7fa9\u3059\u308b\u3002<\/span>\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">FancyInput<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">forwardRef<\/span><span class=\"o\">&lt;<\/span><span class=\"nx\">Handler<\/span><span class=\"o\">&gt;<\/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>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">inputRef<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">useRef<\/span><span class=\"p\">({}<\/span> <span class=\"k\">as<\/span> <span class=\"nx\">HTMLInputElement<\/span><span class=\"p\">);<\/span>\r\n\r\n  <span class=\"nx\">useImperativeHandle<\/span><span class=\"p\">(<\/span><span class=\"nx\">ref<\/span><span class=\"p\">,<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"p\">{<\/span>\r\n      <span class=\"nx\">setFocus<\/span><span class=\"p\">()<\/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=\"nx\">focus<\/span><span class=\"p\">();<\/span>\r\n      <span class=\"p\">}<\/span>\r\n    <span class=\"p\">};<\/span>\r\n  <span class=\"p\">});<\/span>\r\n\r\n  <span class=\"k\">return<\/span> <span class=\"p\">&lt;<\/span><span class=\"nt\">input<\/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=\"na\">type<\/span><span class=\"p\">=<\/span><span class=\"s\">\"text\"<\/span> <span class=\"p\">\/&gt;;<\/span>\r\n<span class=\"p\">});<\/span>\r\n\r\n<span class=\"c1\">\/\/ \u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u4f7f\u3044\u65b9<\/span>\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">App<\/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\">ref<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">useRef<\/span><span class=\"p\">({}<\/span> <span class=\"k\">as<\/span> <span class=\"nx\">Handler<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"k\">return<\/span> <span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">FancyInput<\/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;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nt\">button<\/span>\r\n        <span class=\"na\">onClick<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n          <span class=\"nx\">ref<\/span><span class=\"p\">.<\/span><span class=\"nx\">current<\/span><span class=\"p\">.<\/span><span class=\"nx\">setFocus<\/span><span class=\"p\">();<\/span>\r\n        <span class=\"p\">}<\/span><span class=\"si\">}<\/span>\r\n      <span class=\"p\">&gt;<\/span>\r\n        click\r\n      <span class=\"p\">&lt;\/<\/span><span class=\"nt\">button<\/span><span class=\"p\">&gt;<\/span>\r\n    <span class=\"p\">&lt;\/&gt;<\/span>\r\n  <span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u5728TypeScript\u4e2d\u4f7f\u7528useImperativeHandle\u7684\u793a\u4f8b\u3002 \u5728\u8c03\u7528\u5b50\u7ec4\u4ef6\u4e2d\u5b9a\u4e49\u7684\u65b9\u6cd5\u65f6\uff0c\u53ef\u4ee5\u4f7f [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-38385","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>\u3010React+TypeScript\u3011\u793a\u4f8b\uff1aReact Hooks useImperativeHandle - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, 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