easyui 的 datagrid 高度无法自适应呢？

 <link rel="stylesheet" type="text/css" href="../js/themes/default/easyui.css" />
    <link rel="stylesheet" type="text/css" href="../js/themes/icon.css" />
    <script type="text/javascript" src="../js/jquery-1.4.2.min.js"></script>
    <script type="text/javascript" src="../js/jquery.easyui.js"></script>

     <table id="dg" class="easyui-datagrid">  
        <thead>  
            <tr>  
                <th field="username" width="50">用户名</th>  
                <th field="password" width="50">密码</th>  
                <th field="phone" width="50">电话号</th>  
                <th field="email" width="50">邮箱</th>  
            </tr>  
        </thead>  
    </table>

 <script type="text/javascript">
    //datagrid初始化 
    $('#dg').datagrid({ 
        title:'用户列表', 
        nowrap: false, 
        striped: true, 
        border: true,
        fit: true, 
        url:'../php/user.php', 
        remoteSort:false, 
        fitColumns:true, 
        idField:'fldId', 
        singleSelect:false,
        pagination:true,
        rownumbers:true
    }); 
</script>

1.3.5没问题啊，什么版本的easyui。。