获取url问号后的参数方法

//获取url参数
function GetArgsFromHref(sHref, sArgName)
{
var args    = sHref.split("?");
var retval = "";

if(args[0] == sHref) /*参数为空*/
{
return retval; /*无需做任何处理*/
}
var str = args[1];
args = str.split("&");
for(var i = 0; i < args.length; i ++)
{
str = args[i];
var arg = str.split("=");
if(arg.length <= 1) continue;
if(arg[0] == sArgName) retval = arg[1];
}
return retval;
}