Ajax,vs2010中通常，iis中不能运行

Ajax,vs2010中正常，iis中不能运行。
ajax代码：
$.ajax({
                url: "/Account/LogOnAjax/",
                type: "POST",
                data: {
                    UserName: c,
                    Password: d,
                    RememberMe: $("#ustate").attr("checked")
                },
                dataType: "json",
                timeout: 6e4,
                cache: false,
                success: function (c) {
                    if (c.result) {
                        alert("111");
                        a.login_success(b, c.info);
                    }
                    else {
                        alert("222");
                        a.tipMsg_cont("账号或密码不太对吧！ 重试一次？");
                        a.tipMsg_show(b);
                        a.elem_text_upawd.select();
                        a.login_submit_set({
                            is提交状态: false,
                            is提交按钮: true,
                            is对话框按钮: true,
                            is可点击链接: true
                        })
                    }
                },
                error: function (d, c) {
                    a.login_submit_set({
                        is提交状态: false,
                        is提交按钮: true,
                        is对话框按钮: true,
                        is可点击链接: true
                    });
                    switch (c) {
                        case "timeout":
                            a.tipMsg_cont('对不起！登录已超时，重新<a style="margin-left:3px; color:#369" href="javascript:void(0)" onclick="LKLog_Pawd.re_smt_login();">登录</a>');
                            a.tipMsg_show(b)
                    }
                }
            })
============================================================
AccountController中代码：
[HttpPost]
        public JsonResult LogOnAjax(LogOnModel model)
        {
            //如果用户名与密码都不为空
            if (ModelState.IsValid)
            {
                用户 userInfo = null;

                /* 验证用户登录 */
                int returnValue = MembershipService.ValidateUser(model.UserName, model.Password, out userInfo);
                 #region 处理返回值
                /* 编号不存在 */
                if (returnValue == 1)
                {
                    return LKPageJsonResult.Failure("用户名不存在，请重新输入");
                }
                /* 密码错误 */
                else if (returnValue == 2)
                {
                    return LKPageJsonResult.Failure("密码错误，请重新输入");
                }
                else
                {
                    //保存cookie
                    FormsService.SignIn(userInfo, model.RememberMe);
                    return LKPageJsonResult.Success(new { uname = userInfo.姓名, uemail = userInfo.邮箱, uguid = userInfo.ID });
                }
                #endregion
            }
            else
            {
                return LKPageJsonResult.Failure("请输入您的用户名或密码");
            }
        }
------解决思路----------------------
如果是IIS7的话 好像是需要webserve的吧

请打开webconfig最下面..
 <!-- 
        在 Internet 信息服务 7.0 下运行 ASP.NET AJAX 需要 system.webServer
        节。对早期版本的 IIS 来说则不需要此节。
-->

找到handdle

<add name="CometAsyncHandler" path="CometAsyncHandler.ashx" type="CometAsyncHandler" verb="POST,GET" />

------解决思路----------------------
打开Chrome或者FireBug，里面会有ajax的请求信息，先分析是什么样的错误。