EasyUI 之 easyui-datagrid 字段格式化

<table id="dg"class="easyui-datagrid" style="width:100%;height:auto;"
            url="<%=basePath %>notice/listByPage"
            toolbar="#toolbar" pagination="true"
            title="公告管理"
            rownumbers="true" fitColumns="true" singleSelect="true">
        <thead>
            <tr>
                <th field="title" width="50">标题 </th>
                <th field="content" width="50">内容</th>
                <th field="createDate" width="50">创建时间</th>
                <th field="user" width="50" formatter="formatterByUserName">用户</th>
            </tr>
        </thead>
    </table>

<script type="text/javascript">
    
    function formatterByUserName(val,row){
        if(val==null){
            return "";
        }
        return val.username;
    }
</script>