一个简单的字符串截取的问题

Question

<script>
a="http://www.sohu.com/news/test.asp";
a=a.substr(a.indexOf("//")+"//".length)
a=a.substr(0,a.indexOf("/"))
alert(a)
</script>

Answer 1

<script>
a="http://www.sohu.com/news/test.asp";
alert(GetServer(a))function GetServer(url)
{
url=url.substr(url.indexOf("//")+"//".length)
url=url.substr(0,url.indexOf("/"))
return url
}
</script>

Answer 2

<script>
var url="http://www.sohu.com/abc/bcd/234.htm",url_str;
//url=this.location.toString();
//alert(url);
  url_str = url.split("/");
alert(url_str[2]);
</script>有没有更好的办法？

Answer 3

a = "http://www.sohu.com/news/test.asp";
s = a.replace(/.*\/{2}(.+?)\/.*/, '$1'); 
alert(s);