js获取url参数

http://www.cnblogs.com/fishtreeyu/archive/2011/02/27/1966178.html

function GetQueryString(name)
{
     var reg = new RegExp("(^|&)"+ name +"=([^&]*)(&|$)");
     var r = window.location.search.substr(1).match(reg);
     if(r!=null)return  unescape(r[2]); return null;
}