public ActionResult Login(string account, string pwd)
        {
            SystemManager _system = new SystemManager();
            //登录
            var user = _system.Login(account, pwd);

            //判断是否登录成功
            if (user != null)
            {
                //加入票据
                General.AddTicket(account, string.Format("{0},{1},{2},{3}", user.UserID, user.Name, user.TenantID, user.TenantName));
                return(Redirect(string.Format("/main")));
                //return Redirect(string.Format("{0}.xiafeng.xyz/main", user.TenantName));
            }
            else
            {
                Response.Write("<script>alert('帐号密码不对哦!');location.href='/';</script>");
                Response.End();
                return(null);
            }
        }