element plus el-table 合并行或列（根据列表数据动态合并第一列重复的单元格）

http://element-plus.org/zh-CN/component/table.html#%E5%90%88%E5%B9%B6%E8%A1%8C%E6%88%96%E5%88%97

<script setup>
import { onMounted, ref } from 'vue'
import './index.css'

const objectSpanMethod = ({
  row,
  column,
  rowIndex,
  columnIndex,
}) => {
  if (columnIndex === 0) {
    console.log(row)
    if (row.branchNameIndex === 1) {
      return {
        rowspan: row.count,
        colspan: 1,
      }
    } else {
      return {
        rowspan: 0,
        colspan: 0,
      }
    }
  }
}

let tableData = [
    {
        deviceName: "生产设施",
        branchName: "一部",
        branchTotalStableRate: "97.63",
        deviceTotalDeviationTime: "72.00",
        deviceTotalStableRate: "1.71",
        deviceTotalCountTime: "97.08",
        comLevelDeviationTime: "0.7",
        comLevelTime: "24.00"
    },
    {
        deviceName: "生产设施222",
        branchTotalStableRate: "98.88",
        branchName: "一部",
        deviceTotalDeviationTime: "72.00",
        deviceTotalStableRate: "0.81",
        deviceTotalCountTime: "97.08",
        comLevelDeviationTime: "0.7",
        comLevelTime: "24.00"
    },
    {
        deviceName: "生产设施",
        branchName: "一部",
        branchTotalStableRate: "97.63",
        deviceTotalDeviationTime: "72.00",
        deviceTotalStableRate: "1.71",
        deviceTotalCountTime: "97.08",
        comLevelDeviationTime: "0.7",
        comLevelTime: "24.00"
    },
    {
        deviceName: "生产设施",
        branchName: "四部",
        branchTotalStableRate: "97.63",
        deviceTotalDeviationTime: "72.00",
        deviceTotalStableRate: "1.71",
        deviceTotalCountTime: "97.08",
        comLevelDeviationTime: "0.7",
        comLevelTime: "24.00"
    },
    {
        deviceName: "生产设施",
        branchName: "四部",
        branchTotalStableRate: "97.63",
        deviceTotalDeviationTime: "72.00",
        deviceTotalStableRate: "1.71",
        deviceTotalCountTime: "97.08",
        comLevelDeviationTime: "0.7",
        comLevelTime: "24.00"
    },
    {
        deviceName: "生产设施",
        branchName: "五部",
        branchTotalStableRate: "97.63",
        deviceTotalDeviationTime: "72.00",
        deviceTotalStableRate: "1.71",
        deviceTotalCountTime: "97.08",
        comLevelDeviationTime: "0.7",
        comLevelTime: "24.00"
    },
    {
        deviceName: "生产设施",
        branchName: "五部",
        branchTotalStableRate: "97.63",
        deviceTotalDeviationTime: "72.00",
        deviceTotalStableRate: "1.71",
        deviceTotalCountTime: "97.08",
        comLevelDeviationTime: "0.7",
        comLevelTime: "24.00"
    },
]

let obj = {}
const formatData = (list) => {
  list.forEach(item => {
    let count = list.filter(listItem => listItem.branchName === item.branchName).length
    if (obj[item.branchName] ) {
      obj[item.branchName]++

    } else {
      obj[item.branchName] = 1
    }
    item.branchNameIndex = obj[item.branchName]

    item.count = count
  })
  tableData = list
}

formatData(tableData)


onMounted(() => {

})
</script>

<template>
  <div id="m-list" class="js-list" style="position: relative">
    <el-table
      :data="tableData"
      :span-method="objectSpanMethod"
      border
      style="width: 100%; margin-top: 20px"
    >
      <el-table-column prop="branchName" label="branchName" />
      <el-table-column prop="deviceName" label="deviceName" width="180" />
      <el-table-column prop="count" label="count" />
      <el-table-column prop="branchNameIndex" label="branchNameIndex" />

    </el-table>
  </div>
</template>

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