后台代码：

[HttpPost]        public string DoLogin(string username,string password)        {            return "success";        }

当使用$.ajax时：

var name = $('#txtUserName').val();                var pwd = $('#txtPassWord').val();                var param = "{username:'" + name + "',password:'" + pwd + "'}";                $.ajax({                    type: "POST",                    url: "/Main/DoLogin",                    data: param,                    contentType: "application/json;charset=utf-8",                    success: function (msg)                    {                        var test = msg;                        var test2 = test;                    },                    error: function (e)                    {                        var test = e;                        var test2 = test;                    }                });

当使用$.post时：

var name = $('#txtUserName').val();                var pwd = $('#txtPassWord').val();                var param = { username: name, password: pwd };                $.post('/Main/DoLogin', param, function (result) {                    var test = result;                    alert(test);                },'json');