element ui表格合并-vue2

 实际效果图如下

下面是表格的具体内容

<template>
<el-table
  :data="tableData"
  :span-method="objectSpanMethod"
  border
  height="700px"
  style="width: 100%;height:50vh; margin-top: 20px">
  <el-table-column type="index"></el-table-column>
  <el-table-column
    prop="id"
    label="ID"
    width="180">
  </el-table-column>
  <el-table-column
    prop="name"
    label="姓名"
    height='200'>
    <template v-slot="{row}">
      <span class="accent_color">{
   
   {row.name}}</span>
    </template>
  </el-table-column>
  <el-table-column
    prop="amount1"
    label="数值 1（元）" height='200'>
  </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-column
    width="100px"
    prop="sss"
    label="操作">
    <template v-slot="{row}"><el-button icon="el-icon-delete"></el-button></template>
  </el-table-column>
</el-table>
</template>

 下面是表格的具体数据

data(){
    return{
    tableData: [
     {
      id: '129871222222',
      name: 'Tom2',
      amount1: '234',
      amount2: '3.2',
      amount3: 10,
      sss: 1,
     },

    {
      id: '129871222',
      name: 'Tom',
      amount1: '234',
      amount2: '3.2',
      amount3: 10,
      sss: 1,
    },
    {
      id: '129871222',
      name: 'Tom2',
      amount1: '234',
      amount2: '3.2',
      amount3: 10,
      sss: 1,
  },
  {
    id: '12987122',
    name: 'Tom',
    amount1: '234',
    amount2: '3.2',
    amount3: 10,
    sss: 1,
  },
  {
    id: '12987122',
    name: 'Tom',
    amount1: '234',
    amount2: '3.2',
    amount3: 10,
    sss: 1,
  },
  {
    id: '12987122',
    name: 'Tom',
    amount1: '234',
    amount2: '3.2',
    amount3: 10,
    sss: 1,
  },
  {
    id: '129871222',
    name: 'Tom',
    amount1: '234',
    amount2: '3.2',
    amount3: 10,
    sss: 1,
  },
],    
    }
},

关键的代码是处理数据，通过for循环遍历处理，对需要合并的列的值进行比较，达到合并效果，最后必须将值进行倒序处理否则无效  this.tableData.reverse()

mounted() {
//由于没有调接口，测试数据处理在mounted()钩子里
    this.tableData.reverse()//倒序处理数据，此处可以不写
    //增加属性
    this.tableData.map(item => {
       item.rowspan = 1
     })
//遍历数组，并比较id进行合并
for (let i = 0; i < this.tableData.length; i++) {
  if (i + 1 < this.tableData.length && this.tableData[i].id === this.tableData[i + 1].id) {
    this.tableData[i + 1].rowspan = this.tableData[i].rowspan + 1
    this.tableData[i].rowspan = 0
  }
}
console.log(this.tableData)
this.tableData.reverse()//必须加倒序否则合并表格无效
},

最后是 合并表格的主要方法是  :span-method="objectSpanMethod",写在methods方法里面

methods:{
    objectSpanMethod({row, column, rowIndex, columnIndex}) {
   //columnIndex 默认是从0开始，由于加了序号那列，'id'那列的columnIndex 就是1
  if (columnIndex === 1) {
    return {
      rowspan: row.rowspan,
      colspan: 1
    }
  }
//此处合并的是'name'那列
  if (columnIndex === 2) {
    return {
      rowspan: row.rowspan,
      colspan: 1
    }
  }
//此处合并的是操作那栏 'sss'
  if (columnIndex === 6) {
    return {
      rowspan: row.rowspan,
      colspan: 1
    }
  }
},
}

最后说明一下,方法是我的一个朋友刘总（小刘）帮助下，进一步修改完成的。希望对大家有帮助。