elementUI合并表头

<template>
  <el-table :data="tableData" border style="width: 100%"  :header-cell-style="headerStyle">
    <el-table-column prop="date" label="日期" width="180">
    </el-table-column>
    <el-table-column prop="name" label="姓名" width="180">
    </el-table-column>
    <el-table-column prop="address" label="地址">
    </el-table-column>
  </el-table>
</template>
 
<script>
export default {
  data() {
    return {
      tableData: [{
        date: '2016-05-02',
        name: '王小虎',
        address: '上海市普陀区金沙江路 1518 弄'
      }, {
        date: '2016-05-04',
        name: '王小虎',
        address: '上海市普陀区金沙江路 1517 弄'
      }, {
        date: '2016-05-01',
        name: '王小虎',
        address: '上海市普陀区金沙江路 1519 弄'
      }, {
        date: '2016-05-03',
        name: '王小虎',
        address: '上海市普陀区金沙江路 1516 弄'
      }]
    }
  },
  methods:{
    headerStyle({row, column, rowIndex, columnIndex}) {
      row[1].colSpan = 2 //第二个表头占两格
      row[0].colSpan = 0 //第一个表头占零格
      if (columnIndex === 0) { //隐藏第一个表头
        return 'display: none'
      }
    }
  }
}
</script>