合计指定列ELEMENTUI的TABLE末尾加统计行

table中定义 show-summary :summary-method="getSummaries"

1、只有show-summary，el会统计当前列表的列数据

2、有:summary-method="getSummaries"，可以自定义统计行的字段值

getSummaries方法：

getSummaries(param) {

    const { columns, data } = param;

    const sums = [];

    columns.forEach((column, index) => {

    if (index === 0) {

        sums[index] = '总计';

        return;

    }

 })

说明：

columns，是表格的列，从0开始

data，是列的行集合

return sums，返回统计的结果，这里也可以自定义为总的数据

<el-table :key="tableKey" v-loading="listLoading" :data="list" border fit highlight-current-row

            style="width: 100%;" @selection-change="handleSelectionChange" show-summary :summary-method="getSummaries">

            <el-table-column label="交易日期" prop="TRADEDATE"></el-table-column>

            <el-table-column label="银行名称" prop="BANKNAME"></el-table-column>

            <el-table-column label="缴款渠道名称" prop="CHANNELNAME"></el-table-column>

            <el-table-column label="交易总笔数" prop="TRADECOUNT"></el-table-column>

            <el-table-column label="支付总笔数" prop="PAYCOUNT"></el-table-column>

            <el-table-column label="支付总金额" prop="PAYAMOUNT"></el-table-column>

            <el-table-column label="退款总笔数" prop="REFUNDCOUNT"></el-table-column>

            <el-table-column label="退款总金额" prop="REFUNDAMOUNT"></el-table-column>

            <el-table-column label="应收总金额" prop="RECEIVABLEAMOUNT"></el-table-column>

            <el-table-column label="渠道对账状态" prop="CHANNELSOASTATUSNAME"></el-table-column>

            <el-table-column label="银行资金对账状态" prop="BANKSOASTATUSNAME"></el-table-column>

            <el-table-column label="操作">

                <template slot-scope="scope">

                    <el-button v-waves type="primary" @click="exportData(scope.row.ID)">下载对账文件</el-button>

                    <el-button v-if="scope.row.CHANELSOASTATUS==3" v-waves type="primary"

                        @click="ViewChacuo(scope.row.PAYNOTIFYNO)">查看差错明细</el-button>

                </template>

            </el-table-column>

        </el-table>