{"id":5639,"date":"2022-03-21T17:49:58","date_gmt":"2022-03-21T09:49:58","guid":{"rendered":"http:\/\/39.106.39.94\/?p=5639"},"modified":"2022-04-22T09:39:20","modified_gmt":"2022-04-22T01:39:20","slug":"ref%ef%bc%88%e8%8e%b7%e5%8f%96dom%e5%af%b9%e8%b1%a1%ef%bc%89","status":"publish","type":"post","link":"https:\/\/lilichao.com\/?p=5639","title":{"rendered":"ref\uff08\u83b7\u53d6DOM\u5bf9\u8c61\uff09"},"content":{"rendered":"\n

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ref\u662freference\u7684\u7b80\u5199\uff0c\u6362\u53e5\u8bdd\u8bf4\u5c31\u662f\u7528\u6765\u83b7\u53d6\u771f\u5b9eDOM\u5bf9\u8c61\u7684\u5f15\u7528\u3002\u54b1\u4eec\u4e11\u8bdd\u8fd8\u662f\u8981\u8bf4\u5728\u524d\u8fb9\uff0c\u867d\u7136\u53ef\u4ee5\u83b7\u53d6\u5230DOM\u5bf9\u8c61\uff0c\u4f46\u662f\u8f7b\u6613\u4e0d\u8981\u8fd9\u4e48\u505a\uff0c\u5982\u679c\u5fc5\u987b\u8981\u83b7\u53d6\uff0c\u4e5f\u5c3d\u91cf\u662f\u8bfb\u53d6\u800c\u4e0d\u8981\u4fee\u6539\uff0c\u5982\u679c\u5fc5\u9700\u8981\u4fee\u6539\u4e5f\u8981\u5c3d\u91cf\u51cf\u5c11\u4fee\u6539\u7684\u6b21\u6570\uff0c\u603b\u4e4b\u80fd\u4e0d\u7528\u5c31\u4e0d\u7528\u3002<\/p>\n\n\n\n

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import React<\/em><\/strong>, {useRef} from 'react';

const MyComponent = () => {

    const divRef = useRef();

    const clickHandler = () => {
        console<\/em><\/strong>.log(divRef);
    };

    return (
            <div ref={divRef} onClick={clickHandler}>\u4e00\u4e2adiv<\/div>
           
    );
};

export default MyComponent;<\/pre>\n\n\n\n
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useRef()\u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u666e\u901a\u7684JS\u5bf9\u8c61\uff0cJS\u5bf9\u8c61\u4e2d\u6709\u4e00\u4e2acurrent\u5c5e\u6027\uff0c\u5b83\u6307\u5411\u7684\u4fbf\u662f\u539f\u751f\u7684DOM\u5bf9\u8c61\u3002\u4e0a\u4f8b\u4e2d\uff0c\u5982\u679c\u60f3\u8bbf\u95eediv\u7684\u539f\u751fDOM\u5bf9\u8c61\uff0c\u53ea\u9700\u901a\u8fc7divRef.current<\/code>\u5373\u53ef\u8bbf\u95ee\uff0c\u5b83\u53ef\u4ee5\u8c03\u7528DOM\u5bf9\u8c61\u7684\u5404\u79cd\u65b9\u6cd5\u548c\u5c5e\u6027\uff0c\u4f46\u8fd8\u662f\u8981\u518d\u6b21\u5f3a\u8c03\uff1a\u614e\u7528\uff01<\/p>\n\n\n\n
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useRef()<\/code>\u6240\u8fd4\u56de\u7684\u5bf9\u8c61\u5c31\u662f\u4e00\u4e2a\u666e\u901a\u7684JS\u5bf9\u8c61\uff0c\u6240\u4ee5\u4e0a\u4f8b\u4e2d\u5373\u4f7f\u6211\u4eec\u4e0d\u4f7f\u7528\u94a9\u5b50\u51fd\u6570\uff0c\u4ec5\u4ec5\u521b\u5efa\u4e00\u4e2a\u5f62\u5982{current:null}<\/code>\u7684\u5bf9\u8c61\u4e5f\u662f\u53ef\u4ee5\u7684\u3002\u53ea\u662f\u6211\u4eec\u81ea\u5df1\u521b\u5efa\u7684\u5bf9\u8c61\u7ec4\u4ef6\u6bcf\u6b21\u6e32\u67d3\u65f6\u90fd\u4f1a\u91cd\u65b0\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5bf9\u8c61\uff0c\u800c\u901a\u8fc7useRef()<\/code>\u521b\u5efa\u7684\u5bf9\u8c61\u53ef\u4ee5\u786e\u4fdd\u7ec4\u4ef6\u6bcf\u6b21\u7684\u91cd\u6e32\u67d3\u83b7\u53d6\u5230\u7684\u90fd\u662f\u76f8\u540c\u7684\u5bf9\u8c61\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
React\u4e2d\u6240\u6709\u7684\u64cd\u4f5c\u9ed8\u8ba4\u90fd\u662f\u5728React\u5143\u7d20\u4e0a\u8fdb\u884c\uff0c\u7136\u540e\u518d\u901a\u8fc7\u865a\u62dfDOM\u5e94\u7528\u5230\u771f\u5b9e\u9875\u9762\u4e0a\u7684\u3002\u8fd9\u6837\u505a\u7684\u597d\u5904\u6211\u4eec […]<\/p>\n","protected":false},"author":1,"featured_media":5641,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[198],"tags":[200,202,199,201,203],"_links":{"self":[{"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/posts\/5639"}],"collection":[{"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lilichao.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5639"}],"version-history":[{"count":5,"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/posts\/5639\/revisions"}],"predecessor-version":[{"id":5762,"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/posts\/5639\/revisions\/5762"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/media\/5641"}],"wp:attachment":[{"href":"https:\/\/lilichao.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5639"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lilichao.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5639"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lilichao.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5639"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}