element 表格根据数组合并单元格

:span-method="(...arg)=>strategySpanMethodDown(...arg,deptLevelData)"

deptLevelData: 为需要处理的数组

// 合并单元格函数
    strategySpanMethodDown: function({ row, column, rowIndex, columnIndex }, data) {
      if (columnIndex === 1) {
        var spanArr = this.getSpanArr(data, column.property)
        const _row = spanArr[rowIndex]
        const _col = _row > 0 ? 1 : 0
        return {
          rowspan: _row,
          colspan: _col
        }
      }
    },
    // 处理合并行的数据
    getSpanArr: function(data, spanKey) {
      var spanArr = []
      var pos = ''
      for (var i = 0; i < data.length; i++) {
        if (i === 0) {
          spanArr.push(1)
          pos = 0
        } else {
          // 判断当前元素与上一个元素是否相同 business 为需要根据什么合并
          if (data[i].business === data[i - 1].business) {
            spanArr[pos] += 1
            spanArr.push(0)
          } else {
            spanArr.push(1)
            pos = i
          }
        }
      }
      return spanArr
    },