效果图

html

必须要加上prop

          <el-table :summary-method="getSummaries" show-summary stripe :data="bankData"   border  max-height="500px" highlight-current-row  >
                    <el-table-column  align="center" prop="date"label="英文姓名"  >
                        <template slot-scope="scope">
                                 <span  >@{{ scope.row.date }}</span>
                           </template>
                    </el-table-column>
                     <el-table-column  align="center"  prop="name" label="国籍" >
                            <template slot-scope="scope">
                                   <span >@{{ scope.row.name }}</span>
                             </template>
                     </el-table-column>
                     <el-table-column  align="center" prop="amount1" label="国aa籍" >
                              <template slot-scope="scope">
                                     <span >@{{ scope.row.amount1 }}</span>
                               </template>
                      </el-table-column>
          </el-table>

js

           bankData: [{
                            date: '1',
                            name: '1',
                            amount1: '2',
                          }, {
                            date: '2',  
                            name: '1',
                            amount1: '2',
                          },
                          {
                            date: '31',
                            name: '1',
                            amount1: '2',
                          },    
                          ],

方法

  getSummaries(param) {    // 上面自定义 内容
                        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]));
                        console.log(values)
       
                        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';//当不是number数字是返回的内容  
                        }
                        });
                        console.log(sums);        // 先看输出格式，看最终要返回什么数据
                        return sums;
                    },