element-ui table 根据表格中内容来合并单元格嘛

手册文档介绍的场景过于简单,没有根据table里面内容来合并

<template>
  <div>
    <el-table show-summary :summary-method="getSummaries" :span-method="objectSpanMethod" :data="tableData" row-key="id" ref="tableDom" border>
      <el-table-column label="序号" width="55" align="center">
        <template slot-scope="scope">{{ scope.$index + 1 }}</template>
      </el-table-column>

      <el-table-column prop="name" label="名称" align="center"></el-table-column>
      <el-table-column prop="num1" label="数量1" align="center"></el-table-column>
      <el-table-column prop="num2" label="数量2" align="center"></el-table-column>
      <el-table-column prop="num3" label="数量3" align="center"></el-table-column>
      <!-- <el-table-column prop="type" label="类型" align="center"></el-table-column> -->
      <el-table-column prop="num4" label="数量4" align="center"></el-table-column>
      <el-table-column prop="num5" label="数量5" align="center"></el-table-column>
    </el-table>
  </div>
</template>


<script>
export default {
  name: '',
  components: {},
  props: {},
  data() {
    return {
      tableData: [{
          name: '名称1',
          num1: '2',
          num2: '3',
          num3: '4',
          num4: '连续',
          num5: '6',
          num6: '7',
        }, {
          name: '名称2',
          num1: '2',
          num2: '3',
          num3: '4',
          num4: '连续',
          num5: '6',
          num6: '7',
        }, {
          name: '名称2',
          num1: '2',
          num2: '3',
          num3: '4',
          num4: '连续',
          num5: '6',
          num6: '7',
        }, {
          name: '名称3',
          num1: '2',
          num2: '3',
          num3: '4',
          num4: '连续',
          num5: '6',
          num6: '7',
        }, {
          name: '名称4',
          num1: '2',
          num2: '3',
          num3: '4',
          num4: '连续',
          num5: '6',
          num6: '7',
        }, {
          name: '名称4',
          num1: '2',
          num2: '3',
          num3: '4',
          num4: '连续',
          num5: '6',
          num6: '7',
      }]
    }
  },
  filters: {},
  computed: {},
  watch: {},
  created() {},
  mounted() {},
  beforeDestroy() {},
  methods: {
    // 合计
    getSummaries (param) {
      const { columns, data } = param
      const sums = []
      columns.forEach((column, index) => {
        if (index === 0) {
          sums[index] = '合计'
        } else if (index === 2 || index === 7) {
          const values = data.map(item => Number(item[column.property]))
          if (!values.every(value => isNaN(value))) {
            sums[index] = values.reduce((prev, curr) => {
              const value = Number(curr)
              if (!isNaN(value)) {
                return prev + curr
              } else {
                return prev
              }
            }, 0)
          } else {
            sums[index] = ''
          }
        } else {
          sums[index] = ''
        }
      })
      return sums
    },

    // table合并列
    objectSpanMethod({ row, column, rowIndex, columnIndex }) {
      let data = this.tableData; //拿到当前table中数据
      let cellValue = row[column.property]; //当前位置的值
      let noSortArr = ['num1', 'num2', 'num3', 'num4', 'num5', 'num6']; //不需要合并的字段（不进行合并行的prop）
      if (cellValue && !noSortArr.includes(column.property)) {
        let prevRow = data[rowIndex - 1]; //获取到上一条数据
        let nextRow = data[rowIndex + 1]; //下一条数据
        if (prevRow && prevRow[column.property] === cellValue) { //当有上一条数据，并且和当前值相等时
          return { rowspan: 0, colspan: 0 };
        } else {
          let countRowspan = 1;
          while (nextRow && nextRow[column.property] === cellValue) { //当有下一条数据并且和当前值相等时,获取新的下一条
            nextRow = data[++countRowspan + rowIndex];
          }
          if (countRowspan > 1) {
            return { rowspan: countRowspan, colspan: 1 };
          }
        }
      }
    },


  }
}
</script>
<style scoped lang="less">

</style>