elementui的el-table如何新加一行

新加绿的一行，并且还要合并后面的单元格。但是上面的是循环出来的数据。这个怎么实现啊？

用合计行，再稍加处理即可

<template>
  <div id="app">
    <el-table
    :data="tableData"
    border
    :summary-method="getSummaries"
    show-summary
    style="width: 100%">
    <el-table-column
      prop="id"
      label="ID"
      width="180">
    </el-table-column>
    <el-table-column
      prop="name"
      label="姓名">
    </el-table-column>
    <el-table-column
      prop="amount1"
      sortable
      label="数值 1">
    </el-table-column>
    <el-table-column
      prop="amount2"
      sortable
      label="数值 2">
    </el-table-column>
    <el-table-column
      prop="amount3"
      sortable
      label="数值 3">
    </el-table-column>
  </el-table>
  </div>
</template>

<script>

export default {
  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
      }]
    }
  },
  methods: {
    getSummaries (param) {
      const { columns, data } = param
      console.log(columns, data)
      const sums = []
      columns.forEach((column, index) => {
        if (index === 0) {
          sums[index] = '尾行'
        } else if (index === 1) {
          // colSpan 合并行
          column.colSpan = 4
          sums[index] = '合计的内容'
        }
      })
      return sums
    }
  }
}
</script>

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看下这个，可能有帮助

如果el-table实现起来困难可以考虑一下el-row结合v-for使用，这样可拓展性更高