{"id":167460,"date":"2024-05-08T16:03:04","date_gmt":"2024-05-08T08:03:04","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/167460.html"},"modified":"2024-05-08T16:03:12","modified_gmt":"2024-05-08T08:03:12","slug":"javascript%e7%9a%84%e5%8d%95%e4%be%8b%e6%a8%a1%e5%bc%8f%e6%98%af%e4%bb%80%e4%b9%88","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/167460.html","title":{"rendered":"javascript\u7684\u5355\u4f8b\u6a21\u5f0f\u662f\u4ec0\u4e48"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/27033406\/662d2b77-20ae-4795-9afa-b17ab022abb3.webp\" alt=\"javascript\u7684\u5355\u4f8b\u6a21\u5f0f\u662f\u4ec0\u4e48\" 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class=\"language-javascript\">var Singleton = (function () {<\/p>\n<p>    var instance;<\/p>\n<p>    function createInstance() {<\/p>\n<p>        var object = new Object(&quot;I am the instance&quot;);<\/p>\n<p>        return object;<\/p>\n<p>    }<\/p>\n<p>    return {<\/p>\n<p>        getInstance: function () {<\/p>\n<p>            if (!instance) {<\/p>\n<p>                instance = createInstance();<\/p>\n<p>            }<\/p>\n<p>            return instance;<\/p>\n<p>        }<\/p>\n<p>    };<\/p>\n<p>})();<\/p>\n<p>var instance1 = Singleton.getInstance();<\/p>\n<p>var instance2 = Singleton.getInstance();<\/p>\n<p>console.log(instance1 === instance2);  \/\/ true<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p><strong>\u5728\u8fd9\u4e2a\u7b80\u5355\u7684\u793a\u4f8b\u4e2d\uff0c<code>Singleton<\/code>\u6a21\u5757\u66b4\u9732\u4e86<code>getInstance<\/code>\u65b9\u6cd5\u7528\u6765\u83b7\u53d6\u5355\u4f8b<\/strong>\u3002\u5982\u679c\u5b9e\u4f8b\u4e0d\u5b58\u5728\uff0c\u5b83\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u5b9e\u4f8b\uff1b\u5982\u679c\u5df2\u7ecf\u5b58\u5728\uff0c\u5219\u8fd4\u56de\u4e4b\u524d\u521b\u5efa\u7684\u5b9e\u4f8b\u3002\u8fd9\u786e\u4fdd\u4e86\u4e0d\u7ba1\u591a\u5c11\u6b21\u8c03\u7528<code>getInstance<\/code>\uff0c\u90fd\u53ea\u4f1a\u83b7\u5f97\u76f8\u540c\u7684\u5b9e\u4f8b\u5bf9\u8c61\u3002<\/p>\n<\/p>\n<p><p>\u7efc\u4e0a\u6240\u8ff0\uff0cJavaScript\u7684\u5355\u4f8b\u6a21\u5f0f\u63d0\u4f9b\u4e86\u4e00\u79cd\u7b80\u4fbf\u7684\u65b9\u5f0f\u6765\u5b9e\u73b0\u5bf9\u8d44\u6e90\u7684\u5168\u5c40\u63a7\u5236\u548c\u8bbf\u95ee\u3002\u5176\u5e94\u7528\u8303\u56f4\u5e7f\u6cdb\uff0c\u4f46\u5728\u4f7f\u7528\u65f6\u4e5f\u9700\u8981\u8003\u8651\u5176\u53ef\u80fd\u5e26\u6765\u7684\u5355\u4e00\u804c\u8d23\u539f\u5219\u548c\u5355\u5143\u6d4b\u8bd5\u65b9\u9762\u7684\u95ee\u9898\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p><strong>\u4ec0\u4e48\u662fJavaScript\u5355\u4f8b\u6a21\u5f0f\uff1f<\/strong><br 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