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;
}