el-table自定义表头label
https://www.cnblogs.com/chip-gan/p/12457240.html
<el-table-column :label="地址" :render-header="renderHeader"></el-table-column>
在methods添加renderHeader方法(可以参考elementUI官网rtable详解)
methods: { renderHeader(h) { return ( <div> <span>地址</span> <span style="font-size:12px;">(具体到区县)</span> </div> ) } }