{"id":165826,"date":"2024-05-08T15:24:15","date_gmt":"2024-05-08T07:24:15","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/165826.html"},"modified":"2024-05-08T15:24:21","modified_gmt":"2024-05-08T07:24:21","slug":"javascript%e4%b8%ad%e5%a6%82%e4%bd%95%e6%a3%80%e6%b5%8b%e4%b8%80%e4%b8%aa%e4%ba%8b%e4%bb%b6%e5%9c%a8%e8%af%a5%e6%b5%8f%e8%a7%88%e5%99%a8%e4%b8%ad%e6%98%af%e5%90%a6%e5%ad%98%e5%9c%a8","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/165826.html","title":{"rendered":"Javascript\u4e2d\u5982\u4f55\u68c0\u6d4b\u4e00\u4e2a\u4e8b\u4ef6\u5728\u8be5\u6d4f\u89c8\u5668\u4e2d\u662f\u5426\u5b58\u5728"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/26232855\/f6f210b7-8c6e-447f-b467-f1fcb0d5ea3e.webp\" alt=\"Javascript\u4e2d\u5982\u4f55\u68c0\u6d4b\u4e00\u4e2a\u4e8b\u4ef6\u5728\u8be5\u6d4f\u89c8\u5668\u4e2d\u662f\u5426\u5b58\u5728\" \/><\/p>\n<p><p>\u5728JavaScript\u4e2d\uff0c\u68c0\u6d4b\u4e00\u4e2a\u4e8b\u4ef6\u662f\u5426\u5728\u8be5\u6d4f\u89c8\u5668\u4e2d\u5b58\u5728\u53ef\u4ee5\u901a\u8fc7\u51e0\u4e2a\u4e3b\u8981\u65b9\u5f0f\u8fdb\u884c\uff1a<strong>\u4f7f\u7528<code>in<\/code>\u64cd\u4f5c\u7b26\u3001\u4f7f\u7528<code>typeof<\/code>\u64cd\u4f5c\u7b26\u3001\u5229\u7528\u7279\u6027\u68c0\u6d4b\u5e93<\/strong>\u3002\u8fd9\u4e9b\u65b9\u6cd5\u53ef\u4ee5\u5e2e\u52a9\u5f00\u53d1\u8005\u7f16\u5199\u66f4\u52a0\u5065\u58ee\u548c\u517c\u5bb9\u7684\u4ee3\u7801\u3002\u5176\u4e2d\uff0c\u4f7f\u7528<code>in<\/code>\u64cd\u4f5c\u7b26\u662f\u6700\u76f4\u63a5\u548c\u5e38\u7528\u7684\u65b9\u6cd5\u3002\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u6211\u4eec\u53ef\u4ee5\u68c0\u67e5\u4e8b\u4ef6\u540d\u79f0\u662f\u5426\u4f5c\u4e3awindow\u5bf9\u8c61\uff08\u6216\u8005\u4efb\u4f55DOM\u5143\u7d20\u5bf9\u8c61\uff09\u7684\u4e00\u4e2a\u5c5e\u6027\u5b58\u5728\u3002\u4f8b\u5982\uff0c\u8981\u68c0\u67e5<code>click<\/code>\u4e8b\u4ef6\u662f\u5426\u5b58\u5728\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528<code>&#039;click&#039; 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in window) {<\/p>\n<p>    \/\/ \u4e8b\u4ef6\u5b58\u5728\u7684\u5904\u7406\u903b\u8f91<\/p>\n<p>} else {<\/p>\n<p>    \/\/ \u4e8b\u4ef6\u4e0d\u5b58\u5728\u7684\u5904\u7406\u903b\u8f91<\/p>\n<p>}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8fd9\u79cd\u65b9\u6cd5\u7684\u4f18\u70b9\u662f\u4ee3\u7801\u7b80\u6d01\uff0c\u6613\u4e8e\u7406\u89e3\u548c\u5b9e\u65bd\u3002\u7136\u800c\uff0c\u5b83\u4e5f\u6709\u5c40\u9650\u6027\uff0c\u56e0\u4e3a\u4e00\u4e9b\u8f83\u65b0\u7684\u4e8b\u4ef6\u53ef\u80fd\u53ea\u5728\u7279\u5b9a\u7684\u5143\u7d20\u4e0a\u5f97\u5230\u652f\u6301\uff0c\u800c\u975e\u5168\u5c40\u7684<code>window<\/code>\u5bf9\u8c61\u3002<\/p>\n<\/p>\n<p><h3>\u4e8c\u3001\u4f7f\u7528TYPEOF\u64cd\u4f5c\u7b26\u68c0\u6d4b\u4e8b\u4ef6<\/h3>\n<\/p>\n<p><p>\u53e6\u4e00\u79cd\u7528\u4e8e\u68c0\u6d4b\u4e8b\u4ef6\u5b58\u5728\u6027\u7684\u65b9\u6cd5\u662f\u4f7f\u7528<code>typeof<\/code>\u64cd\u4f5c\u7b26\u3002\u901a\u8fc7\u68c0\u67e5\u4e8b\u4ef6\u5904\u7406\u5668\u5c5e\u6027\u7684\u7c7b\u578b\uff0c\u6211\u4eec\u53ef\u4ee5\u786e\u5b9a\u67d0\u4e2a\u4e8b\u4ef6\u662f\u5426\u88ab\u6d4f\u89c8\u5668\u6240\u652f\u6301\u3002\u4f8b\u5982\uff0c\u8981\u68c0\u6d4b<code>onblur<\/code>\u4e8b\u4ef6\u662f\u5426\u5b58\u5728\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">if (typeof window.onblur === &#039;function&#039;) {<\/p>\n<p>    \/\/ \u4e8b\u4ef6\u5b58\u5728\u7684\u5904\u7406\u903b\u8f91<\/p>\n<p>} else {<\/p>\n<p>    \/\/ \u4e8b\u4ef6\u4e0d\u5b58\u5728\u7684\u5904\u7406\u903b\u8f91<\/p>\n<p>}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u867d\u7136\u8fd9\u79cd\u65b9\u6cd5\u770b\u8d77\u6765\u4e0e\u4f7f\u7528<code>in<\/code>\u64cd\u4f5c\u7b26\u7c7b\u4f3c\uff0c\u4f46\u5b83\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\u7684\u51c6\u786e\u6027\u53ef\u80fd\u66f4\u9ad8\uff0c\u5c24\u5176\u662f\u5f53\u4e8b\u4ef6\u5904\u7406\u5668\u5c5e\u6027\u7684\u5b58\u5728\u5e76\u4e0d\u4ee3\u8868\u4e8b\u4ef6\u672c\u8eab\u88ab\u652f\u6301\u65f6\u3002<\/p>\n<\/p>\n<p><h3>\u4e09\u3001\u5229\u7528\u7279\u6027\u68c0\u6d4b\u5e93\u68c0\u6d4b\u4e8b\u4ef6<\/h3>\n<\/p>\n<p><p>\u5bf9\u4e8e\u66f4\u590d\u6742\u7684\u60c5\u51b5\uff0c\u6216\u8005\u5f53\u9700\u8981\u68c0\u6d4b\u4e00\u5927\u6279\u4e8b\u4ef6\u7684\u652f\u6301\u60c5\u51b5\u65f6\uff0c\u624b\u5de5\u68c0\u6d4b\u53ef\u80fd\u4f1a\u53d8\u5f97\u65e2\u7e41\u7410\u53c8\u56f0\u96be\u3002\u8fd9\u65f6\uff0c\u5229\u7528\u73b0\u6709\u7684\u7279\u6027\u68c0\u6d4b\u5e93\u5c31\u663e\u5f97\u975e\u5e38\u6709\u7528\u3002<strong>Modernizr<\/strong>\u662f\u4e00\u4e2a\u8457\u540d\u7684JavaScript\u5e93\uff0c\u80fd\u591f\u5e2e\u52a9\u5f00\u53d1\u8005\u68c0\u6d4b\u6d4f\u89c8\u5668\u5bf9HTML5\u548cCSS3\u7279\u6027\u7684\u652f\u6301\u60c5\u51b5\uff0c\u5305\u62ec\u5404\u79cd\u4e8b\u4ef6\u3002\u4f7f\u7528Modernizr\uff0c\u6211\u4eec\u53ef\u4ee5\u8f7b\u677e\u5224\u65ad\u7279\u5b9a\u4e8b\u4ef6\u662f\u5426\u88ab\u652f\u6301\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">if (Modernizr.touch) {<\/p>\n<p>    \/\/ \u89e6\u6478\u4e8b\u4ef6\u5b58\u5728\u7684\u5904\u7406\u903b\u8f91<\/p>\n<p>} else {<\/p>\n<p>    \/\/ \u89e6\u6478\u4e8b\u4ef6\u4e0d\u5b58\u5728\u7684\u5904\u7406\u903b\u8f91<\/p>\n<p>}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>Modernizr\u4e0d\u4ec5\u53ef\u4ee5\u68c0\u6d4b\u4e8b\u4ef6\uff0c\u8fd8\u80fd\u68c0\u6d4b\u5176\u4ed6\u5f88\u591a\u7c7b\u578b\u7684\u7279\u6027\uff0c\u4f7f\u5176\u6210\u4e3a\u5f00\u53d1\u8005\u5de5\u5177\u7bb1\u4e2d\u975e\u5e38\u6709\u4ef7\u503c\u7684\u4e00\u90e8\u5206\u3002<\/p>\n<\/p>\n<p><h3>\u56db\u3001\u603b\u7ed3<\/h3>\n<\/p>\n<p><p>\u68c0\u6d4b\u6d4f\u89c8\u5668\u4e2d\u4e8b\u4ef6\u7684\u5b58\u5728\u6027\u5bf9\u4e8e\u7f16\u5199\u517c\u5bb9\u6027\u597d\u3001\u7528\u6237\u4f53\u9a8c\u4f73\u7684Web\u5e94\u7528\u81f3\u5173\u91cd\u8981\u3002\u901a\u8fc7\u4e0a\u8ff0\u65b9\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u6709\u6548\u5730\u786e\u5b9a\u7279\u5b9a\u4e8b\u4ef6\u5728\u5f53\u524d\u6d4f\u89c8\u5668\u73af\u5883\u4e0b\u662f\u5426\u5f97\u5230\u652f\u6301\uff0c\u5e76\u636e\u6b64\u91c7\u53d6\u76f8\u5e94\u7684\u5904\u7406\u63aa\u65bd\u3002\u65e0\u8bba\u662f\u4f7f\u7528\u7b80\u5355\u7684<code>in<\/code>\u6216<code>typeof<\/code>\u64cd\u4f5c\u7b26\uff0c\u8fd8\u662f\u501f\u52a9\u529f\u80fd\u5f3a\u5927\u7684\u7279\u6027\u68c0\u6d4b\u5e93\uff0c\u91cd\u8981\u7684\u662f\u9009\u62e9\u9002\u5408\u81ea\u5df1\u9879\u76ee\u9700\u6c42\u7684\u68c0\u6d4b\u65b9\u6cd5\uff0c\u786e\u4fdd\u4ee3\u7801\u7684\u5065\u58ee\u6027\u548c\u517c\u5bb9\u6027\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p><strong>\u5982\u4f55\u5728Javascript\u4e2d\u5224\u65ad\u4e00\u4e2a\u4e8b\u4ef6\u662f\u5426\u5b58\u5728\u4e8e\u5f53\u524d\u7684\u6d4f\u89c8\u5668\u4e2d\uff1f<\/strong><\/p>\n<ol>\n<li>\n<p><strong>\u5982\u4f55\u68c0\u6d4b\u7279\u5b9a\u4e8b\u4ef6\u662f\u5426\u652f\u6301\uff1f<\/strong><br \/>\n\u9996\u5148\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528<code>&quot;on&quot; 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