asp.net mvc ajax 外部js 异步递交 form的实现

页面文件类似：
<% using (Ajax.BeginForm("AjaxUpdate", 123, new AjaxOptions {
Confirm = "confirm str", LoadingElementId = "idLoading", UpdateTargetId
= "textEntered", OnSuccess = "validateForm" },new{id="idMyForm"}))
       { %>
       <%=Html.EditorFor(c=>c) %>
       <span id="textEntered">Nothing Entered
        Result
      </span>
    <% } %>
<input type="button" value="Client Click" onclick="ClientClick(event)" /><br />
    <script type="text/javascript">
        function ClientClick(event) {
            var form = document.getElementById("idMyForm")
            var action = form.getAttribute("onsubmit").toString().replace(/this/ig, "form");
            eval(action)
        }
    </script>