return Content("<script language='javascript' type='text/javascript'>alert('重新添加！');history.go(-1);</script>");

return Content("<script language='javascript' type='text/javascript'>alert('验证码输入错误！请重新输入！');history.go(-1);location.reload();</script>");

context.Response.ClearContent();
context.Response.Write("<script language=javascript>alert('您没有权限访问此项功能，请与网络管理员联系！');</script>");