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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>判断对象是否是某一类型</title>
<script language="javascript" type="text/javascript">
var obj = new String("脚本");
alert(obj instanceof String);
</script>
</head>

<body>
</body>
</html>