前端vue中el-table增加合计行及合并单元格代码示例

<el-table :align="rowTableCenter" id="tables" :data="data"
                          :summary-method="addTotal"  :show-summary="true"  border>
                  <el-table-column label="序号" type="index" align="center"/>

//合计行
    addTotal(param) {
      const { columns, data } = param;
      // console.log(columns)
      const sums = [];
      columns.forEach((column, index) => {
        if (index === 0 ) {
          console.log(column)
          column.colSpan = 4;  //行占用格数
          column.rowSpan = 1;  //列占用格数
          sums[index] = '权重得分合计';
        }
        if(index !== 0 && index !== 4){
          column.rowSpan = 0;
          column.colSpan = 0;
          // column.style = {
          //   "display":"none"  //这里加了但是没有作用效果
          // }
          console.log(column)
          return;
        }
        const values = data.map(item => Number(item[column.property]));
        if(index === 4){
          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] = 'N/A';
          }
        }
      });
//在合计行方法中直接去修改了单元格样式
      //合并单元格
      this.$nextTick(() => {
        const tds = document.querySelectorAll('#tables .el-table__footer tr>td');
        console.log(tds)
        tds.forEach(function (val, index) {
          if (tds[0].innerText === '权重得分合计') {
            if(index !== 0 && index !== 4){
              val.style.display = 'none';
            }else{
              val.style.textAlign = 'center';
            }
            // val.style.display = 'none';
            // val.style.fontSize = '16px';
            // val.style.borderColor = '#aaaaaa';
            // val.style.color = '#fff';
          }
        })
      }, 1000)
      return sums;
    },