如何允许colspan和rowspan导出excel在datatable jquery插件中

Question

<table>
    <thead>
        <tr>
            <th colspan="4" align="center">This is header</th>
        </tr>
        <tr>
            <th>S.No</th>
            <th>Class Name</th>
            <th>Section</th>
            <th>Enrollment Code</th>
        </tr>
    </thead>
    <tbody>
        <tr>
            <td>1</td>
            <td>1st</td>
            <td>A</td>
            <td>101</td>
        </tr>
        <tr>
            <td>1</td>
            <td>1st</td>
            <td>A</td>
            <td>101</td>
        </tr>
    </tbody>
</table>

上面是我的表格，带有标题colspan和rowspan，对于我正在添加数据表插件的表格，如下所示

$('table').DataTable({
            "scrollX": true,
            "paging": true,
            "bSort": false,
            "sScrollXInner": "100%",
            "lengthMenu": [[50, 100, 500, -1], ["50", "100", "500", "All"]],
            dom: 'Bfrtip',
            buttons: [
                'excelHtml5',
            ]
        });

当我点击导出按钮时，它会删除第一行并导出剩余数据，以便在datatable插件中导出excel中的colspan和rowspan。请帮帮我。