2 添加另一种动态合并单元格方法

由于原文动态合并单元格写的比较繁琐，这里将提供更简单的办法
通过findIndex与findLastIndex分别找到需要合并的数据开始位置与结束位置，再由结束位置 - 开始位置即可得出合并几行，列同理。

<template>
  <div>
    <el-table :data="tableData" style="width: 100%" :span-method="spanMethod" ref="tableRef">
      <el-table-column prop="date" label="日期" width="150"> </el-table-column>
      <el-table-column label="配送信息">
        <el-table-column prop="name" label="姓名" width="120">
        </el-table-column>
        <el-table-column label="地址">
          <el-table-column prop="province" label="省份" width="120">
          </el-table-column>
          <el-table-column prop="city" label="市区" width="120">
          </el-table-column>
          <el-table-column prop="address" label="地址" width="300">
          </el-table-column>
          <el-table-column prop="zip" label="邮编" width="120">
          </el-table-column>
          <el-table-column prop="articleNumber" label="物品数量" width="120">
          </el-table-column>
          <el-table-column prop="zipNumber" label="邮件数量" width="120">
          </el-table-column>
          <el-table-column prop="zipNumber" label="数量" width="120">
          </el-table-column>
        </el-table-column>
      </el-table-column>
    </el-table>
  </div>
</template>

<script>
export default {
    
    
  name: "tableMerge",
  data () {
    
    
    return {
    
    
      tableColumnSpanTime: [],
      tableData: [
        {
    
    
          id: "1",
          date: "2016-05-03",
          name: "王小虎",
          province: "上海",
          city: "普陀区",
          address: "上海市普陀区金沙江路 1518 弄",
          zip: 200333,
          articleNumber: 10,
          zipNumber: 15,
        },
        {
    
    
          id: "1",
          date: "2016-05-02",
          name: "王小虎",
          province: "上海",
          city: "普陀区",
          address: "上海市普陀区金沙江路 1518 弄",
          zip: 200333,
          articleNumber: 10,
          zipNumber: 15,
        },
        {
    
    
          id: "2",
          date: "2016-05-04",
          name: "王小虎",
          province: "上海",
          city: "普陀区",
          address: "上海市普陀区金沙江路 1518 弄",
          zip: 200333,
          articleNumber: 10,
          zipNumber: 15,
        },
        {
    
    
          id: "3",
          date: "2016-05-01",
          name: "王小虎",
          province: "上海",
          city: "普陀区",
          address: "上海市普陀区金沙江路 1518 弄",
          zip: 200333,
          articleNumber: 10,
          zipNumber: 15,
        },
        {
    
    
          id: "3",
          date: "2016-05-08",
          name: "王小虎",
          province: "上海",
          city: "普陀区",
          address: "上海市普陀区金沙江路 1518 弄",
          zip: 200333,
          articleNumber: 10,
          zipNumber: 15,
        },
        {
    
    
          id: "3",
          date: "2016-05-06",
          name: "王小虎",
          province: "上海",
          city: "普陀区",
          address: "上海市普陀区金沙江路 1518 弄",
          zip: 200333,
          articleNumber: 10,
          zipNumber: 15,
        },
        {
    
    
          id: "4",
          date: "2016-05-07",
          name: "王小虎",
          province: "上海",
          city: "普陀区",
          address: "上海市普陀区金沙江路 1518 弄",
          zip: 200333,
          articleNumber: 10,
          zipNumber: 15,
        },
      ],
    };
  },
  mounted () {
    
    
    this.mergingRule();
  },
  methods: {
    
    
  	// 制定合并规则
    mergingRule () {
    
    
      let val = []
      this.tableData.forEach((x, index) => {
    
    
      	// 判断是否已存入相同项
        if (val.find(v => x.id === v.id)) {
    
    
          val.push(x)
          this.tableColumnSpanTime.push({
    
     start: '', end: "" })
        } else {
    
    
          val = []
          val.push(x)
          this.tableColumnSpanTime.push({
    
     start: this.tableData.findIndex(item => item.id === x.id), end: this.tableData.findLastIndex(item => item.id === x.id) + 1 })
        }
      })
      console.log(this.tableColumnSpanTime);
    },
    // 合并单元格
    // { 当前行的值, 当前列的值, 行的下标, 列的下标 }
    spanMethod ({
     
      row, column, rowIndex, columnIndex }) {
    
    
      try {
    
    
        if (columnIndex === 0 || columnIndex === 2) {
    
    
          if (this.tableColumnSpanTime[rowIndex].end !== '' && this.tableColumnSpanTime[rowIndex].start !== '') {
    
    
            return {
    
    
              rowspan: this.tableColumnSpanTime[rowIndex].end - this.tableColumnSpanTime[rowIndex].start,
              colspan: 1,
            };
          } else {
    
    
            return {
    
    
              rowspan: 0,
              colspan: 0,
            };
          }
        }
      } catch (error) {
    
    
        // console.log(error);
      }
    },
  },
};
</script>

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