<el-table
        :key="tableKey"
        ref="myTable"
        :data="tepowpowyue"
        border
        height="100%"
        show-summary
        :summary-method="getSummaries"
        style="width: 100%; height: 100%; overflow: auto"
        @selection-change="handleSelectionChange"
      >
        <el-table-column type="selection" width="55" fixed> </el-table-column>
        <el-table-column fixed prop="siteName" label="电站名称" width="120">
          <template slot-scope="scope">
            <span
              style="
                overflow: hidden;
                text-overflow: ellipsis;
                white-space: nowrap;
              "
              >{{ scope.row.siteName }}</span
            >
          </template>
        </el-table-column>

        <el-table-column
          v-for="(item, index) in dataList"
          :key="index"
          :prop="'dataList.' + index + '.dataValue'"
          :label="item.timeInterval"
        >
          <template slot-scope="scope">
            {{ scope.row.dataList[index].dataValue }}
          </template>
        </el-table-column>
      </el-table>

<script>
export default {

 methods: {

getSummaries(param) {
      const { columns, data } = param;
      const sums = [];
      columns.forEach((column, index) => {
        if (index === 0) {
          sums[index] = '总计';
          return;
        }
        const values = data.map(item => Number(item.dataList[index - 1]?.dataValue || 0));
        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] += ' ';
        } else {
          sums[index] = '';
        }
      });




}





}
</script>

如果你需要自定义汇总行的内容，可以使用 summary-method 属性