easyui datagrid footer 页脚问题

  public string IndexV2()
        {
            var dataGridJson = new DataGridJson();
            var data = new List<MyClass11>
                           {
                               new MyClass11() {  AuditUser="a"},   
                               new MyClass11() {  AuditUser="aa"}
                               ,    new MyClass11() {  AuditUser="bb"}
                           };
            dataGridJson.rows = data;
            dataGridJson.total = 3;
            dataGridJson.footer = new List<MyClass11 >{ new MyClass11{ AuditUser = "cc" }};
            return JsonConvert.SerializeObject(dataGridJson);
        }
        public class MyClass11
        {
            public string AuditUser;
        }

  <table id="testgrid" class="easyui-datagrid" title="别人对我的奖扣" style="width: 100%;"
        data-options="url: ‘@Url.Action("IndexV2", "UserRecord")‘,
                method: ‘POST‘,
                fitColumns: true,
                singleSelect: true,
                rownumbers: true,
                showFooter: true">
        <thead>
            <tr>
                <th data-options="field:‘AuditUser‘">名称</th>
            </tr>
        </thead>
    </table>