public ActionResult Change(string email, string oldPassword, string newPassword)
        {
            AjaxResult ajaxResult = new AjaxResult();

            if (email == "" || oldPassword == "" || newPassword == "")
            {
                ajaxResult.Result    = DoResult.Failed;
                ajaxResult.PromptMsg = "请将信息填全!!";
            }
            else
            {
                user u = (user)Session["USER"];
                if (u.Email == email && u.Password == oldPassword)
                {
                    if (Op_User.changePass(u, newPassword))
                    {
                        Session.Abandon();
                        ajaxResult.Result    = DoResult.Success;
                        ajaxResult.PromptMsg = "修改成功,请重新登录";
                    }
                    else
                    {
                        ajaxResult.Result    = DoResult.Failed;
                        ajaxResult.PromptMsg = "修改失败,请重试";
                    }
                }
                else
                {
                    ajaxResult.Result    = DoResult.Failed;
                    ajaxResult.PromptMsg = "邮箱或者原密码不对";
                }
            }
            return(Json(ajaxResult));
        }