//查询角色
        public ActionResult Role_query(string rolename)
        {
            List <Role> roles = dbDrive.QueryRoles(rolename);

            //code--信息状态,默认为0,msg--返回信息,count--数据条数,data--数据
            return(Json(new { code = 0, msg = "", count = roles.Count, data = roles }, JsonRequestBehavior.AllowGet));
        }