ASP.NET MVC通过勾选checkbox更改select的内容

    public class Old
    {
        public int Id { get; set; }
        public string Name { get; set; }
    }

    public class NewItem
    {
        public int Id { get; set; }
        public string Name { get; set; }
    }

   public class HomeController : Controller
    {
        public ActionResult Index()
        {
            return View();
        }
        public ActionResult GetOld()
        {
            var olds = new List<Old>
            {
                new Old(){Id = 1, Name = "老版本1"},
                new Old(){Id = 2, Name = "老版本2"},
                new Old(){Id = 3, Name = "老版本3"}
            };
            IDictionary<string, string> result = new Dictionary<string, string> {{"-1","None"}};
            foreach (var item in olds)
            {
                result.Add(item.Id.ToString(), item.Name);
            }
            return Json(result, JsonRequestBehavior.AllowGet);
        }
        public ActionResult GetNew()
        {
            var news = new List<NewItem>
            {
                new NewItem(){Id = 1, Name = "新版本1"},
                new NewItem(){Id = 2, Name = "新版本2"}
            };
            IDictionary<string, string> result = new Dictionary<string, string> { { "-1", "None" } };
            foreach (var item in news)
            {
                result.Add(item.Id.ToString(), item.Name);
            }
            return Json(result, JsonRequestBehavior.AllowGet);
        }
    }

@{
    ViewBag.Title = "Index";
    Layout = "~/Views/Shared/_Layout.cshtml";
}
<h2>Index</h2>
<div>
    <select id="v"></select>
</div>
<div>
    <span>是否选择新版本：</span><input type="checkbox" id="cn"/>
</div>
@section scripts
{
    <script type="text/javascript">
        $(function () {
            //初始获取老版本
            getOldOnes();
            //勾选checkbox事件
            $('#cn').on("change", function() {
                if ($(this).is(':checked')) {
                    getNewOnes();
                } else {
                    getOldOnes();
                }
            });
        });
        //获取老版本
        function getOldOnes() {
            $.getJSON('@Url.Action("GetOld","Home")', function(data) {
                var $s = $('#v');
                $s.children().remove();
                $.each(data, function(key, value) {
                    $s.append('<option value="' + key + '">' + value + "</option>");
                });
                $s.effect('shake', { times: 4 }, 100);
            });
        }
        //获取新版本
        function getNewOnes() {
            $.getJSON('@Url.Action("GetNew","Home")', function (data) {
                var $s = $('#v');
                $s.children().remove();
                $.each(data, function (key, value) {
                    $s.append('<option value="' + key + '">' + value + "</option>");
                });
                $s.effect('shake', { times: 4 }, 100);
            });
        }
    </script>
}