var orderCode = getCode("orderCode");

--js 获取url参数值

function getCode(orderCode) {
            new RegExp("(^|&)" + orderCode + "=([^&]*)").exec(window.location.search.substr(1));
            return RegExp.$2
        }

  /// <summary>
        /// 取HttpRequest请求中名称为ParamName的参数的值，包括QueryString和Form参数，没有该参数时取DefaultValue为默认值。QueryString参数优先于Form参数使用
        /// </summary>
        public static string GetParam(HttpRequest Request, string ParamName, string DefaultValue)
        {
            string ParamValue = string.Empty;
            if (DefaultValue != string.Empty)
                ParamValue = DefaultValue;
            if (Request.QueryString[ParamName] != null)
            {
                ParamValue = Request.QueryString[ParamName].Trim();
            }
            if (Request.QueryString[ParamName] == null)
            {
                if (Request.Form[ParamName] != null)
                {
                    ParamValue = Request.Form[ParamName].Trim();
                }
            }
            return ParamValue;
        }