element表格的多层级合并

效果如下：

代码如下：

html：

<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="姓名"
      />
      <el-table-column
        prop="amount1"
        label="数值 1（元）"
      />
      <el-table-column
        prop="amount2"
        label="数值 2（元）"
      />
      <el-table-column
        prop="amount3"
        label="数值 3（元）"
      />
      <el-table-column
        prop="amount1"
        label="数值 1（元）"
      />
      <el-table-column
        prop="amount2"
        label="数值 2（元）"
      />
      <el-table-column
        prop="amount3"
        label="数值 3（元）"
      />
      <el-table-column
        prop="amount1"
        label="数值 1（元）"
      />
      <el-table-column
        prop="amount2"
        label="数值 2（元）"
      />
      <el-table-column
        prop="amount3"
        label="数值 3（元）"
      />
      <el-table-column
        prop="amount1"
        label="数值 1（元）"
      />
      <el-table-column
        prop="amount2"
        label="数值 2（元）"
      />
      <el-table-column
        prop="amount3"
        label="数值 3（元）"
      />
      <el-table-column
        prop="amount1"
        label="数值 1（元）"
      />
      <el-table-column
        prop="amount2"
        label="数值 2（元）"
      />
      <el-table-column
        prop="amount3"
        label="数值 3（元）"
      />
      <el-table-column
        prop="amount1"
        label="数值 1（元）"
      />
      <el-table-column
        prop="amount2"
        label="数值 2（元）"
      />
      <el-table-column
        prop="amount3"
        label="数值 3（元）"
      />
      <el-table-column
        prop="amount1"
        label="数值 1（元）"
      />
      <el-table-column
        prop="amount2"
        label="数值 2（元）"
      />
    </el-table>

js:

 data() {
    return {
      tableData: [
        {
          id: '12987122',
          name: '王小虎',
          amount1: '234',
          amount2: '3.2',
          amount3: 10
        },
        {
          id: '12987123',
          name: '王小虎',
          amount1: '165',
          amount2: '4.43',
          amount3: 12
        },
        {
          id: '12987124',
          name: '王小虎',
          amount1: '324',
          amount2: '1.9',
          amount3: 9
        },
        {
          id: '12987125',
          name: '王小虎',
          amount1: '621',
          amount2: '2.2',
          amount3: 17
        },
        {
          id: '12987126',
          name: '王小虎',
          amount1: '539',
          amount2: '4.1',
          amount3: 15
        },
        {
          id: '12987123',
          name: '王小虎',
          amount1: '165',
          amount2: '4.43',
          amount3: 12
        },
        {
          id: '12987124',
          name: '王小虎',
          amount1: '324',
          amount2: '1.9',
          amount3: 9
        },
        {
          id: '12987125',
          name: '王小虎',
          amount1: '621',
          amount2: '2.2',
          amount3: 17
        },
        {
          id: '12987126',
          name: '王小虎',
          amount1: '539',
          amount2: '4.1',
          amount3: 15
        },
        {
          id: '12987123',
          name: '王小虎',
          amount1: '165',
          amount2: '4.43',
          amount3: 12
        },
        {
          id: '12987124',
          name: '王小虎',
          amount1: '324',
          amount2: '1.9',
          amount3: 9
        },
        {
          id: '12987125',
          name: '王小虎',
          amount1: '621',
          amount2: '2.2',
          amount3: 17
        },
        {
          id: '12987126',
          name: '王小虎',
          amount1: '539',
          amount2: '4.1',
          amount3: 15
        }
      ]
    };
  },
  // 方法集合
  methods: {
    objectSpanMethod({ row, column, rowIndex, columnIndex }) {
      if (columnIndex < 4) {
        if (rowIndex % 8 === 0) {
          return {
            rowspan: 8,
            colspan: 1
          };
        } else {
          return {
            rowspan: 0,
            colspan: 0
          };
        }
      } else if (columnIndex < 7) {
        if (rowIndex % 4 === 0) {
          return {
            rowspan: 4,
            colspan: 1
          };
        } else {
          return {
            rowspan: 0,
            colspan: 0
          };
        }
      } else if (columnIndex < 11) {
        if (rowIndex % 2 === 0) {
          return {
            rowspan: 2,
            colspan: 1
          };
        } else {
          return {
            rowspan: 0,
            colspan: 0
          };
        }
      }
    }
  }