MVC的Ajax异步请求

  @using (Ajax.BeginForm("GetTime","order",new AjaxOptions()
            {
                Confirm="你确认这么做吗？",
                HttpMethod="post",
                OnSuccess = "afterajax",
                UpdateTargetId="result",
                InsertionMode=InsertionMode.Replace,
                LoadingElementId = "loading",
            }))
        {

            <input type="text" name="txtname" />
            <input type="submit" name="获取时间"  />
        }
        <div id="loading">
            <img src="~/Content/Images/loading.gif" />
        </div>
        <div id="result">

        </div>   

　　Html部分代码

<script src="~/Scripts/jquery-1.8.2.js"></script>
<script src="~/Scripts/jquery.unobtrusive-ajax.js"></script>
<script type="text/javascript">
$(function () {
$("#loading").css("display", "none");
$("#btnGetTime").click(function () {
$.ajax({
url: "/order/GetTime",
data: {},
type: "post",
success: function (data) {
alert(data);
}

});
$.get("/order/GetTime", {}, function (data) {
alert(data);
});
}
)
});
function afterajax(data) {
alert("ff");

}
function aff() {
$("#loading").css("display", "none");
}

</script>