context.Response.ContentType = "text/plain";
 string openid = context.Request.QueryString["openid"];  // ajax傳入來的openid ,數據表中一定要有該字段，即QQ的openid為唯一值
 string jsonstr = context.Request.QueryString["jsonstr"];   // ajax傳入來的jsonstr字符

            DAL.UserDAL dal = new DAL.UserDAL();
            Model.User u = dal.GetModelByCond("openid='" + openid + "'");
            if (u != null)
            {
                //用戶已存在
                string name = u.username;
                string qq = u.qq;
                string email = u.email;
                string face = u.headImg;
                //context.Session["user"] = u;
                HttpCookie cook;
                string roles = "user";  //用戶角色
                FormsAuthenticationTicket ticket = new FormsAuthenticationTicket(
                    1, name, DateTime.Now, DateTime.Now.AddMinutes(60), false, roles);
                cook = new HttpCookie("mycook");
                cook.Value = FormsAuthentication.Encrypt(ticket);
                context.Response.Cookies.Add(cook);
                //context.Response.Redirect("/index.html");
                context.Response.Write(JsonMapper.ToJson(new { name = name, qq = qq, email = email, face = face }));
                context.Response.End();
            }
            else
            {
                //不存在
                JsonData jd = JsonMapper.ToObject(jsonstr);
                string name = jd["nickname"].ToString();
                string face = jd["figureurl_2"].ToString();
                u = new Model.User() { headImg = face, username = name, openid = openid, email = "", qq = "" };
                int resid = dal.Add(u);  //添加到數據庫中
                u.id = resid;
                // context.Session["user"] = u;
                HttpCookie cook;
                string roles = "user";  //用戶角色
                FormsAuthenticationTicket ticket = new FormsAuthenticationTicket(
                    1, name, DateTime.Now, DateTime.Now.AddMinutes(60), false, roles);
                cook = new HttpCookie("mycook");
                cook.Value = FormsAuthentication.Encrypt(ticket);
                context.Response.Cookies.Add(cook);
                //context.Response.Redirect("/index.html");
                context.Response.Write(JsonMapper.ToJson(new { name = name, qq = "", email = "", face = face }));
                context.Response.End();
            }