$(document).ready(function () {
           $("#btnLogin").click(function () {
               $.ajax({
                   url: '/Home/Login',
                   data: '{ "account":"' + $("#account").val() + '", "psword": "' + $("#psword").val() + '" }',
                   type: "post",
                   contentType: "application/json;charset=utf-8",
                   dataType: "json"
                   ,
                   success: function (data) {
                       if (data != "")
                           alert(data);
                       else
                           location.href = "/Home/Index"                  
                   }
               });
           });
       });

[HttpPost]
        public ActionResult Login(string account, string psword)
        {
            JsonResult result;
            if ("" == account "" == psword)
                result = this.Json("");            
            else
            {
                result=this.Json("用户或密码不正确");               
            }          
            return result;

        }