实例代码“Ctrl+/”提示“F11/ESC”全屏 返回 格式化 恢复 运行
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<!DOCTYPE html>
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<html>
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<head>
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    <title>Determining Type Example 1</title>
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    <script type="text/javascript">
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        var s = "Nicholas";
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        var b = true;
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        var i = 22;
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        var u;
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        var n = null;
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        var o = new Object();
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        alert(typeof s);   //string
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        alert(typeof i);   //number
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        alert(typeof b);   //Boolean
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        alert(typeof u);   //undefined
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        alert(typeof n);   //object
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        alert(typeof o);   //object
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​
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    </script>
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</head>
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<body>
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​
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</body>
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</html>