Bootstrap Table 如何像下面壹樣額外添加壹行標題？

<table class="cusTable">

<thead>

<tr>

<th data-colspan="50" data-align="center">就業情況</th>

</tr>

<tr>

<th data-colspan="5" data-align="center">就業</th>

<th data-colspan="5" data-align="center">就業</th>

<th data-colspan="5" data-align="center">就業</th>

</tr>

<tr>

<th data-field="ceshi">1</th>

<th data-field="ceshi">2</th>

<th data-field="ceshi">2</th>

<th data-field="ceshi">2</th>

<th data-field="ceshi">2</th>

<th data-field="ceshi">水平</th>

<th data-field="ceshi">水平</th>

<th data-field="ceshi">水平</th>

<th data-field="ceshi">水平</th>

<th data-field="ceshi">水平</th>

<th data-field="ceshi">測試</th>

<th data-field="ceshi">測試</th>

<th data-field="ceshi">測試</th>

<th data-field="ceshi">測試</th>

<th data-field="ceshi">測試</th>

</tr>

</thead>

</table>

引入bootstrap的js做出來是這樣的，