效果如下

因为合计el-table的合并方法是不生效的,所以需要修改css下手

  watch: {
    // 应急物资的合计合并
    planData: {
      immediate: true,
      handler() {
        setTimeout(() => {
          const tds = document.querySelectorAll(
            ".pro_table .el-table__footer-wrapper tr>td"
          );
          tds[0].colSpan = 7;
          tds[0].style.textAlign = "center";
          tds[1].style.display = "none";
          tds[2].style.display = "none";
          tds[3].style.display = "none";
          tds[4].style.display = "none";
          tds[5].style.display = "none";
          tds[6].style.display = "none";
        }, 0);
      },
    },
  },

    // 合计行方法
    getSummaries(param) {
      const { columns, data } = param;
      const sums = [];
      columns.forEach((column, index) => {
        if (index === 0) {
          sums[index] = "合计";
          return;
        }

        const values = data.map((item) => Number(item[column.property]));

        if (
          !values.every((value) => isNaN(value)) &&
          (index === 7 || index === 8)
        ) {
          sums[index] = values.reduce((prev, curr) => {
            const value = Number(curr);
            if (!isNaN(value)) {
              return prev + curr;
            } else {
              return prev;
            }
          }, 0);
          sums[index] += "";
        } else {
          sums[index] = "";
        }
      });

      // 将合计结果返回，是一个数组，每个位置的值与表格的列一一对应
      return sums;
    },