Vue：Table合并行于列

<template>
  <div>
    <el-table
      :data="tableData"
      :span-method="mergeCells"
      style="width: 100%">
      <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>
  </div>
</template>

<script>
export default {
  data() {
    return {
      tableData: [
        { date: '2023-10-01', name: 'Tom', address: 'No. 189, Grove St, Los Angeles' },
        { date: '2023-10-01', name: 'Tom', address: 'No. 189, Grove St, Los Angeles' },
        { date: '2023-10-02', name: 'Jerry', address: 'No. 189, Grove St, Los Angeles' },
        { date: '2023-10-02', name: 'Jerry', address: 'No. 189, Grove St, Los Angeles' },
        { date: '2023-10-03', name: 'Spike', address: 'No. 189, Grove St, Los Angeles' }
      ]
    };
  },
  methods: {
    mergeCells({ row, column, rowIndex, columnIndex }) {
      if (columnIndex === 0) { // 假设我们要合并的是第一列（日期列）
        const _row = this.tableData[rowIndex];
        const _prevRow = this.tableData[rowIndex - 1];
        if (_prevRow && _prevRow.date === _row.date) {
          return {
            rowspan: 0,
            colspan: 1
          };
        } else {
          let count = 1;
          for (let i = rowIndex + 1; i < this.tableData.length; i++) {
            if (this.tableData[i].date === _row.date) {
              count++;
            } else {
              break;
            }
          }
          return {
            rowspan: count,
            colspan: 1
          };
        }
      }
    }
  }
};
</script>