ASP.NET MVC AJAX值无法显示

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视图：

  function success(arg) {
        var obj = arg.get_response().get_object();                   
        if (obj.ErrorMessage === '') {
           var answer = document.createElement('div');
           answer.appendChild(document.createTextNode(obj.Answer));
           document.getElementById('answers').appendChild(answer);
       } else {
          document.getElementById('errors').innerHTML = obj.ErrorMessage;
       }
    }   

<% using (Ajax.BeginForm("EditOrganizationMeta", "Organization", new AjaxOptions { HttpMethod = "POST", OnSuccess = "success" })) { %>             

    <input type="submit" name="button<%=OrganizationMeta.vcr_MetaKey + Lang.int_LangId %>" value="Save" />
    <div id="errors"></div>
    <div id="answers"></div>

<% } %>
  function success(arg) {