<input type="button" id="btnTest" value="测试" /><br /><br />

<textarea id="txtArea" rows="5" cols="200"></textarea>

<script type="text/javascript" src="jquery-1.7.1.min.js"></script>

<script type="text/javascript">

    $(document).ready(function () {

        $("#btnTest").click(function () {

            var users = new Array();

            var user = { UserName: "subendong", Password: "123456" };

            users.push(user);

            user = { UserName: "bendongsu", Password: "654321" };

            users.push(user);

            var userData = {Users : users, Address: "苏州市"};

            $.ajax({

                type: 'post',

                url: "@Url.Action("Test")",

                data: JSON.stringify(userData),

                dataType: "json",
contentType: 'application/json',

                success: function (data) {

                    $("#txtArea").val(JSON.stringify(data));

                }

            });

        });

    });

</script>

        public ActionResult Test(UserData userData)

        {

            return Json(userData);

        }

    public class UserData

    {

        public List<User> Users { get; set; }

        public string Address { get; set; }

    }

    public class User

    {

        public string UserName { get; set; }

        public string Password { get; set; }

    }