合计代码同官网代码不变

<template>
  <el-table
    :data="tableData"
    border
    show-summary
    style="width: 100%">
    <el-table-column
      prop="id"
      label="ID"
      width="180">
    </el-table-column>
    <el-table-column
      prop="name"
      label="姓名">
    </el-table-column>
    <el-table-column
      prop="amount1"
      sortable
      label="数值 1">
    </el-table-column>
    <el-table-column
      prop="amount2"
      sortable
      label="数值 2">
    </el-table-column>
    <el-table-column
      prop="amount3"
      sortable
      label="数值 3">
    </el-table-column>
  </el-table>
</template>

<script>
  export default {
    data() {
      return {
        tableData: [{
          id: '12987122',
          name: '王小虎',
          amount1: '234',
          amount2: '3.2',
          amount3: 10
        }, {
          id: '12987123',
          name: '王小虎',
          amount1: '165',
          amount2: '4.43',
          amount3: 12
        }, {
          id: '12987124',
          name: '王小虎',
          amount1: '324',
          amount2: '1.9',
          amount3: 9
        }, {
          id: '12987125',
          name: '王小虎',
          amount1: '621',
          amount2: '2.2',
          amount3: 17
        }, {
          id: '12987126',
          name: '王小虎',
          amount1: '539',
          amount2: '4.1',
          amount3: 15
        }]
      };
    },
    methods: {
      getSummaries(param) {
        const { columns, data } = param;
        const sums = [];
        columns.forEach((column, index) => {
          if (index === 0) {
            sums[index] = '总价';
            return;
          }
          const values = data.map(item => Number(item[column.property]));
          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);
            sums[index] += ' 元';
          } else {
            sums[index] = 'N/A';
          }
        });

        return sums;
      }
    }
  };
</script>

样式调整

<style scoped lang="scss">
/* 存在固定列时，合计行位置修改 */
.el-table :deep(.el-table__fixed) {
  display: flex;
  flex-direction: column;
}

.el-table :deep(.el-table__fixed-footer-wrapper),
.el-table :deep(.el-table__fixed-body-wrapper),
.el-table :deep(.el-table__fixed-header-wrapper) {
  position: initial;
}

// 固定列放到第一行
.el-table :deep(.el-table__fixed-body-wrapper) {
  order: 1;
}

.el-table :deep(.el-table__fixed-footer-wrapper tbody td.el-table__cell) {
  border-top: none;
  /* background: black; */
  color: #606266;
  /* font-weight: bolder; */
}

/* 存在固定列时，合计行位置修改开始 */

/* 默认有1px去掉样式影响 */
.el-table :deep(.el-table__fixed::before) {
  height: 0;
}

/* 合计行整体样式修改开始 */
.el-table :deep(.el-table__footer-wrapper tbody td) {
  /* background: black; */
  color: #606266;
  /* font-weight: bolder; */
}

/* 合计行整体样式修改结束*/

/* 合计行位置修改开始 */
.el-table {
  display: flex;
  flex-direction: column;
}

.el-table :deep(.el-table__body-wrapper) {
  order: 1;
}

/* 合计行位置修改结束*/
</style>