el-table中合并垂直方向的单元格

一、合并垂直方向单元格，有相同字段的合并一起

合并一起的都有相同的字段mergeType

      <el-table
        class="merge-table"
        :data="tableData"
        v-loading="isLoading"
        :span-method="spanMethod"
        element-loading-text="拼命加载中"
        element-loading-spinner="el-icon-loading"
        element-loading-background="rgba(0, 0, 0, 0.8)"
        size="mini"
        empty-text="暂无数据"
        :stripe="true"
        border
        style="width: 100%"
      >
      </el-table>


		spanMethod({ row, column, rowIndex, columnIndex }) {
		      if (
		        columnIndex === 0 ||
		        columnIndex === 1 ||
		        columnIndex === 2 ||
		        columnIndex === 3 ||
		        columnIndex === 4 ||
		        columnIndex === 5 ||
		        columnIndex === 6 ||
		        columnIndex === 7
		      ) {
		        // 缓存通过筛选条件得到的数组，避免重复计算
		        const tempArr = this.tableData.filter(b => b.mergeType === row.mergeType);
		        const isFirstRow =
		          rowIndex === this.tableData.findIndex(item => item.mergeType === row.mergeType);
		        if (isFirstRow) {
		          return {
		            rowspan: tempArr.length,
		            colspan: 1,
		          };
		        } else {
		          return {
		            rowspan: 0,
		            colspan: 0,
		          };
		        }
		      } else {
		        return {
		          rowspan: 1,
		          colspan: 1,
		        };
		      }
		    },