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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>
<script src="a.js?url=www.jj.com" id="s"></script>
<title>无标题页</title>
</head>
<body>
<script type="text/javascript">
function queryString(key,url)
{
var regex_str = "^.+\\?.*?\\b"+ key +"=(.*?)(?:(?=&)|$|#)"
var regex = new RegExp(regex_str,"i");
//var url = window.location.toString();
if(regex.test(url)) return RegExp.$1;
return undefined;
}
var s = document.getElementById("s");
var url = queryString("url",s.src);
alert(url)
</script>
</body>
</html>
var d = document.getElementsByTagName('script');
alert(d[d.length - 1].src.split('?')[1])