public ActionResult Add(Userd userd) { if (bll.AddUserd(userd) == 1) { return(RedirectToAction("Index", "HomePage")); } else if (bll.AddUserd(userd) == 2) { return(Content("<script>alert('注册失败');history.go(-1);</script>")); } else { return(Content("<script>alert('账号已存在');history.go(-1);</script>")); } }