json数据格式datagrid绑定问题

    <thead>
        <tr>
            <th  data-options="field:'ck',checkbox:true" ></th>
            <th data-option="field:'id',title:'自增ID'" width="100" hidden="true"></th>
            <th data-options="field:'UserRealName',title:'姓名'" width="100"></th>
            <th data-options="field:'UserName',title:'用户名'" width="100"></th>
            <th data-options="field:'ActionType',title:'操作类型'" width="100"></th>
            <th data-options="field:'Note',title:'备注'" width="100"></th>
            <th data-options="field:'UserIP',title:'用户IP'" width="100"></th>
            <th data-options="field:'OperateTime',title:'操作时间',formatter:function(val,index){return new Date(val).Format('yyyy-MM-dd hh:mm:ss');}" width="130"></th>
            <th data-options="field:'OrganizeName',title:'单位'" width="100"></th>
            <th data-options="field:'RoleName',title:'角色'" width="100"></th>
        </tr>
    </thead>

  $('#datagridddd').datagrid({
            rownumbers:true,
            singleSelect:false,
            autoRowHeight:false,
            pagination: false,
            method:'post',
            idField:'id',
            pageSize:20,
            url: 'QueryData',
            columns: [[
                { field: 'UserRealName',title: '姓名', width:130 },
            { field: 'UserName', title: '用户名', width: 130 }
            ]]
        });