Layui：数据表格渲染二级表头

//方法渲染
table.render({
  cols:  [[ //标题栏
    {field: 'username', title: '联系人',  80, rowspan: 2} //rowspan即纵向跨越的单元格数
    ,{field: 'amount', title: '金额',  80, rowspan: 2}
    ,{align: 'center', title: '地址', colspan: 3} //colspan即横跨的单元格数，这种情况下不用设置field和width
  ], [
    {field: 'province', title: '省',  80}
    ,{field: 'city', title: '市',  120}
    ,{field: 'county', title: '详细',  300}
  ]]
});
 
//自动渲染
<table class="layui-table" lay-data="{基础参数}">
  <thead>
    <tr>
      <th lay-data="{field:'username', 80}" rowspan="2">联系人</th>
      <th lay-data="{field:'amount', 120}" rowspan="2">金额</th>
      <th lay-data="{align:'center'}" colspan="3">地址</th>
    </tr>
    <tr>
      <th lay-data="{field:'province', 80}">省</th>
      <th lay-data="{field:'city', 120}">市</th>
      <th lay-data="{field:'county', 300}">详细</th>
    </tr>
  </thead>
</table>