element-plus/docs/examples/table/rowspan-and-colspan.vue

<template>
  <div>
    <el-table
      :data="tableData"
      :span-method="arraySpanMethod"
      border
      style="width: 100%"
    >
      <el-table-column prop="id" label="ID" width="180" />
      <el-table-column prop="name" label="Name" />
      <el-table-column prop="amount1" sortable label="Amount 1" />
      <el-table-column prop="amount2" sortable label="Amount 2" />
      <el-table-column prop="amount3" sortable label="Amount 3" />
    </el-table>

    <el-table
      :data="tableData"
      :span-method="objectSpanMethod"
      border
      style="width: 100%; margin-top: 20px"
    >
      <el-table-column prop="id" label="ID" width="180" />
      <el-table-column prop="name" label="Name" />
      <el-table-column prop="amount1" label="Amount 1" />
      <el-table-column prop="amount2" label="Amount 2" />
      <el-table-column prop="amount3" label="Amount 3" />
    </el-table>
  </div>
</template>

<script lang="ts">
export default {
  data() {
    return {
      tableData: [
        {
          id: '12987122',
          name: 'Tom',
          amount1: '234',
          amount2: '3.2',
          amount3: 10,
        },
        {
          id: '12987123',
          name: 'Tom',
          amount1: '165',
          amount2: '4.43',
          amount3: 12,
        },
        {
          id: '12987124',
          name: 'Tom',
          amount1: '324',
          amount2: '1.9',
          amount3: 9,
        },
        {
          id: '12987125',
          name: 'Tom',
          amount1: '621',
          amount2: '2.2',
          amount3: 17,
        },
        {
          id: '12987126',
          name: 'Tom',
          amount1: '539',
          amount2: '4.1',
          amount3: 15,
        },
      ],
    }
  },
  methods: {
    arraySpanMethod({ row, column, rowIndex, columnIndex }) {
      if (rowIndex % 2 === 0) {
        if (columnIndex === 0) {
          return [1, 2]
        } else if (columnIndex === 1) {
          return [0, 0]
        }
      }
    },

    objectSpanMethod({ row, column, rowIndex, columnIndex }) {
      if (columnIndex === 0) {
        if (rowIndex % 2 === 0) {
          return {
            rowspan: 2,
            colspan: 1,
          }
        } else {
          return {
            rowspan: 0,
            colspan: 0,
          }
        }
      }
    },
  },
}
</script>