📄 2-8.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>类型转换</title>
<script language="javascript">
var a = 3;
var b = a + "";
var c = a.toString();
var d = "student" + a;
alert(typeof(a) + " " + typeof(b) + " " + typeof(c) + " " + typeof(d));
</script>
</head>
<body>
</body>
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