数值型

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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 xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script language="javascript" >
var b = 599999;
var c = 455268545;
var t = 6;
var s =9;    

alert("b+c="+(b+c)+" "+"t+s="+(t+s));

</script>

</head>

<body>

</body>
</html>

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