el-table实现最后一行合计功能并合并指定单元格

效果图如下：

表格代码如下：

<el-table width="100%"ref="tableRef" style="margin-bottom: 15px;":data="jlData"class="tableHeader6"header-row-class-name="headerStyleTr6":row-class-name="tableRowClassName"show-summary:span-method="arraySpanMethod"><el-table-column prop="staff_name" label="姓名"></el-table-column><el-table-column prop="staff_id" label="工号"></el-table-column><el-table-column prop="syjlTotal" label="使用量"></el-table-column><el-table-column min-width="125px" prop="xzjlTotal" label="处理报告下载量"></el-table-column><el-table-column min-width="125px" prop="cxbgTotal" label="撤销报告下载量"></el-table-column><el-table-column min-width="110px" prop="lyTotal" label="录音下载量"></el-table-column>
</el-table>

const arraySpanMethod = ({ row, column, rowIndex, columnIndex }:any)=> {nextTick(()=>{if(tableRef.value.$el){let current = tableRef.value.$el.querySelector(".el-table__footer-wrapper").querySelector(".el-table__footer")// cell[0].innerHTML = '合计数'  修改文本let cell = current.rows[0].cellscell[0].style.textAlign = "center"; // 合计行第一列字段居中显示。cell[1].style.display = "none"; // 隐藏被合并的单元格，不隐藏的话还会占着位置。cell[0].colSpan = "2"; // 合并单元格个数console.log(cell,'cell')//修改单元格的样式for(let i=0;i<cell.length;i++){console.log(cell[i])if(i==0){cell[i].style.color = 'red'}else{cell[i].style.color = 'orange'}}}})}