1.需要计算的数量固定（如表1，已知需要计算的金额为：装修履约保证金 + 装修垃圾清运费+出入证工本费 + 出入证押金 这四项相加，可以写成固定的算法）：

表格样式：

   <h4 style="margin: 0 0 8px 0;font-weight: 600">
     收费信息
    </h4>
    <ele-pro-table
            bordered
            ref="tableRef"
            row-key="releaseId"
            :columns="columns"
            :datasource="datasource"
            :scroll="{ x: 900 }"
            :toolkit="[]"   
            :key =" form.decorationManageId  "   
          >
           
          </ele-pro-table>
          <a-row :gutter="8" style="padding:10px;border-bottom:1px solid #e8e8e8">
    <a-col :xl="8" :lg="12" :md="12" :sm="24" :xs="24" >
    
      <span >合计金额(元)：<span style="color:red">{{form.tableLast}}</span></span>
    </a-col> 
    </a-row>

js部分：

  // 表格1列配置
  const columns = ref([
    {
      title: '序号',
      key: 'index',
      width: 80,
      align: 'center',
      fixed: 'left',
      hideInSetting: true,
      customRender: ({ index }) => index + (tableRef.value?.tableIndex ?? 0)
    },

    {
      title: '项目',
      dataIndex: 'decorationItemName'
    },
    {
      title: '单价',
      dataIndex: 'unitPrice'
    },
    {
      title: '数量',
      dataIndex: 'amount'
    },
    {
      title: '金额(元)',
      dataIndex: 'paymentAmount'
    }
   
  ]);
    // 表格数据源
    const datasource =async ({ page, limit, where, orders }) => {  
    const result = await pageItem({decorationManageId: form.decorationManageId});
    if (result.length > 0) {
    form.tableLast  = result[0].paymentAmount +  result[1].paymentAmount + result[2].paymentAmount+ result[3].paymentAmount 
      return result; 
    } else {
      return [];
    }
    };

2.需要计算的数量不固定 （如表2 支付可能分几次支付，数据是根据后台信息来的，就需要循环计算！）:

样式：

  <h4 style="margin: 10px 0 8px 0;font-weight: 600">
     支付信息
    </h4>
    <ele-pro-table
            bordered
            ref="tableRef1"
            row-key="releaseId1"
            :columns="columns1"
            :datasource="datasource1"
            :scroll="{ x: 900 }"
            :toolkit="[]"     
            :key =" form.decorationManageId "         
          >           
                          
          </ele-pro-table>
          <a-row :gutter="8" style="padding:10px;border-bottom:1px solid #e8e8e8">
    <a-col :xl="8" :lg="12" :md="12" :sm="24" :xs="24" >

      <span >已支付金额(元)：<span style="color:red">{{form.tableLast1}}</span><span style="margin-left:40px">剩余应支付金额(元)：<span style="color:red">{{form.tableLast2}}</span></span></span>
    </a-col> 
    </a-row>

js部分：

  // 表格数据源
    const datasource1 =async ({ page, limit, where, orders }) => {  
    const result = await pageDetail({decorationManageId: form.decorationManageId});
    if (result.length > 0) {
      form.tableLast1 = 0
      form.tableLast2 = 0
      result.forEach((item) => {
        if (item.paymentType == 0) {
          item. paymentType  = '现金';
        } else if (item.paymentType == 1) {
          item.paymentType = '云闪付(储蓄卡)';
        } else if (item.paymentType == 2) {
          item.paymentType = '微信';
        } else if (item.paymentType == 3) {
          item.paymentType = '支付宝';
        }  else if (item.paymentType == 4) {
          item.paymentType = '微信小程序';
        }  else if (item.paymentType == 5) {
          item.paymentType = '云闪付(信用卡)';
        } 
         if (item.paymentStatus == 0) {
          item.paymentStatus = '未支付';          
        } else if (item.paymentStatus == 1) {
          item.paymentStatus = '支付中';
        } else if (item.paymentStatus == 2) {
          item.paymentStatus = '支付完成';
        } 
        if( item.paymentStatus == '支付完成' || item.paymentStatus == 2){       
 
        form.tableLast1  += item.paymentAmount *1;        

        console.log( item.paymentAmount +1,' item.paymentAmount');
      
      }else {
       
        form.tableLast2 += item.paymentAmount
      }
      });
  
      return result; 
    } else {
      return [];
    }
  };