SOURCE

var Main = {
    data() {
      return {
        tableData6: [{
          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: '12987122',
          name: '王小虎1',
          amount1: '234',
          amount2: '3.2',
          amount3: 10
        }, {
          id: '12987123',
          name: '王小虎1',
          amount1: '165',
          amount2: '4.43',
          amount3: 12
        }, {
          id: '12987124',
          name: '王小虎1',
          amount1: '324',
          amount2: '1.9',
          amount3: 9
        }, {
          id: '12987125',
          name: '王小虎1',
          amount1: '621',
          amount2: '2.2',
          amount3: 17
        }, {
          id: '12987126',
          name: '王小虎1',
          amount1: '539',
          amount2: '4.1',
          amount3: 15
        }, {
          id: '12987125',
          name: '王小虎2',
          amount1: '621',
          amount2: '2.2',
          amount3: 17
        }, {
          id: '12987126',
          name: '王小虎2',
          amount1: '539',
          amount2: '4.1',
          amount3: 15
        }],
        arr1:[]
      };
    },
    created() {
    	this.setdates(this.tableData6)
    },
    methods: {
    	setdates(arr) {
          var obj = {},
              k, arr1 = [];
          for(var i = 0, len = arr.length; i < len; i++) {
              k = arr[i].name;
              if(obj[k])
                  obj[k]++;
              else
                  obj[k] = 1;
          }
          console.log(obj)
          //保存结果{el-'元素'，count-出现次数}
          for(var o in obj) {
              for(let i=0;i<obj[o];i++){
              	if(i===0){
                	this.arr1.push(obj[o])
                }else{
                	this.arr1.push(1)
                }
              }
          }
          
          console.log(this.arr1);
      },
      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 === 1) {
          if ( this.arr1[rowIndex] !== 1) {
            return {
              rowspan: this.arr1[rowIndex],
              colspan: 1
            };
          } else {
            return {
              rowspan: 0,
              colspan: 0
            };
          }
        }
      }
    }
  };
var Ctor = Vue.extend(Main)
new Ctor().$mount('#app')

<script src="//unpkg.com/vue/dist/vue.js"></script>
<script src="//unpkg.com/element-ui@2.3.7/lib/index.js"></script>
<div id="app">
<template>
  <div>
    <el-table :data="tableData6" :span-method="objectSpanMethod" border style="width: 100%; margin-top: 20px">
      <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" label="数值 1（元）">
      </el-table-column>
      <el-table-column prop="amount2" label="数值 2（元）">
      </el-table-column>
      <el-table-column prop="amount3" label="数值 3（元）">
      </el-table-column>
    </el-table>
  </div>
</template>
</div>

@import url("//unpkg.com/element-ui@2.3.7/lib/theme-chalk/index.css");