$.ajax({    dataType: "jsonp",    data: { "ajaxMethod": "getusergamesign", "cookieid": cookieid },    jsonp: "jsonp_callback",  //服务器端接收，用于function名，随便定义    url: ‘http://b.test.com/Ajax/UserGameSign.ashx‘,  //请求不同域名的地址    success: _callBack,   //也可以写function(result) {...};    error: function() {        alert(‘服务器内部错误！‘);    }});var _callBack = function(result) {   //result为返回的值：{"code":0,"msg":"IB"}  if (result != null) {    if (result.code == 0) {        alert(result.msg);    }}};

type : "get", //或postasync:false, //我试了没起到同步的效果

 public class UserGameSign : BaseCommon, IHttpHandler    {        public void ProcessRequest(HttpContext context)        {                try                {                    if (!string.IsNullOrEmpty(context.Request["ajaxMethod"]))                    {                        string responseText = "";                        context.Response.ContentType = "text/plain";                        string ajaxMethod = context.Request["ajaxMethod"].ToLower();                        switch (ajaxMethod)                        {                            case "getusergamesign":                                responseText = this.GetUserGameSign(context);                                break;                            default:                                break;                        }                        context.Response.Write(responseText); //返回的结果：{"code":0,"msg":"IB"}                        context.Response.End();                    }                }                catch (Exception ex) //解决此错误：Thread was being aborted. 问题详解>>                {                    if (!(ex is System.Threading.ThreadAbortException))                    {                        context.Response.Write(ex.Message);                        context.Response.End();                    }                }        }        /// <summary>        /// 获取用户标签        /// </summary>        /// <param name="context"></param>        /// <returns></returns>        public string GetUserGameSign(HttpContext context)        {            string cookieIdstr = context.Request["cookieid"];            string strFormat = "{{\"code\":{0},\"msg\":\"{1}\"}}";            //判断是否是jsonp方式请求             string jsonp = string.Empty;            if (!string.IsNullOrEmpty(HttpContext.Current.Request["jsonp_callback"]))            {                jsonp = context.Request["jsonp_callback"];                context.Response.ContentType = "text/javascript";            }            User user = new User();            string userProperty = user.GetUseProperty(cookieId);            if (!string.IsNullOrEmpty(userProperty))            {                if (string.IsNullOrEmpty(jsonp))                {                    return string.Format(strFormat, 0, userProperty); //正常形式返回                }                else                {
                    //jsonp类型的返回 格式：jsonp({"code":0,"msg":"IB"}) 作为前端ajax回调函数的参数                    return jsonp + "(" + string.Format(strFormat, 0, userProperty) + ")";                 }            }            else            {                return string.Format(strFormat, -1, "失败");            }        }    }