Easyui datagrid加载本地Json数据

<table  id="loginInfoTable"
             class="easyui-datagrid"  
        title="学生信息一览"    
        border="0"  
        cellspacing="0"  
        cellpadding="0"  
        iconCls="icon-edit"   
        width="98%"   
        pagination="true"  
        remoteSort="false"   
        singleSelect="false"   
        showFooter="false"  
        striped="true"   

    <thead>  
        <tr align="center">  
            <th field="id"  width="200">ID</th>  
            <th field="name"  width="100">姓名</th>  
            <th field="sex"  width="150">性别</th>
            <th field="birthday"  width="100">生日</th>  
            <th field="addr"  width="100">家庭住址</th>  
            <th field="classid"  width="100">所属班级</th>  
            <th field="grade"  width="100">成绩</th> 
        </tr>  
    </thead>  
</table>  

 
  </body>
  <script type="text/javascript">
 $(document).ready(function () {
  //doQueryData();
  //doloadData();
  var jsondata='{"total":1,"rows":[{"id":"M000005","name":"检测设备","sex":1,"birthday":"1991-03-17","addr":"双城市","classid":"03","grade":"78"}]}';
  alert(jsondata);
  var data = $.parseJSON(jsondata); 
  $('#loginInfoTable').datagrid('reload'); 
  $('#loginInfoTable').datagrid('loadData', data);
 
 });