el-table纵向垂直表头

参考：https://www.jianshu.com/p/1f38eaffd070

<el-table
  style="width: 100%"
  :data="getValues"
  :show-header="false"
  border
  :cell-style="cellStyle"
>
  <el-table-column
    v-for="(item, index) in getHeaders"
    :key="index"
    :prop="item"
  >
  </el-table-column>
</el-table>
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data() {
    return {
      headers: [
	      {
	        prop: 'date',
	        label: '套餐交割时间',
	      },
	      {
	        prop: 'name',
	        label: '价格（元/kWh）',
	      },
	    ],
	    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'
	      }
	    ]
    }
  },
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computed: {
  getHeaders() {
    return this.tableData.reduce((pre, cur, index) => pre.concat(`value${index}`), ['title'])
  },
  getValues() {
    return this.headers.map(item => {
      return this.tableData.reduce((pre, cur, index) => Object.assign(pre, {['value' + index]: cur[item.prop]}), {'title': item.label,});
    });
  }
},
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methods: {
    cellStyle ({row, column, rowIndex, columnIndex}) {
      if(columnIndex===0) {
        return 'background: #F5F7FA; textAlign: center'
      }
      return 'textAlign: center'
    }
  },
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