注意点：

1. <el-table> 中 加:summary-method="getSummaries"

2. <el-table-column> 中要加 prop

// 房间号的合计去掉
 getSummaries (param) {
  const { columns, data } = param
  const sums = []
  columns.forEach((column, index) => {
  if (index === 0) {
   sums[index] = '总计'
  } else if (index === 5 || index === 6) {
   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)
   } else {
   sums[index] = 'N/A'
   }
  } else {
   sums[index] = '--'
  }
  })
  return sums
 }

效果图

补充知识：vue+elementUI的表格最后一行合计自定义显示

1.在看了elementUI的文档后重要的俩个属性是 show-summary :summary-method="getSummaries" getSummaries这个是自定义方法函数的方法。

HTML的代码：

show-summary :summary-method="getSummaries的属性要加上，还有一个很重要的一点就是要 必须要在el-table-column中必须是prop来传值"

<el-table :key='tableKey' :data="listData" show-summary :summary-method="getSummaries" v-loading="listLoading" border fit highlight-current-row
    style="width:100%;margin-top:8px" :header-cell-style="{background:'oldlace'}">>
    
     <el-table-column prop="equipmentType" align="center" label="设备类型" min-width="50">
     </el-table-column>
     <el-table-column prop="equipmentName" align="center" label="设备名称" min-width="50">
     </el-table-column>
     <el-table-column prop="equipmentCode" align="center" label="设备编号" min-width="50">
     </el-table-column>
     <el-table-column prop="openRate" align="center" label="开机率" min-width="50">
     </el-table-column>
     <el-table-column prop="planWorkTime" align="center" label="计划工作时间" min-width="50">
     </el-table-column>
     <el-table-column prop="closeTime" align="center" label="关机时间(h)" min-width="50">
     </el-table-column>
     <el-table-column prop="machiningTime" align="center" label="加工时间(h)" min-width="50">
     </el-table-column>
     <el-table-column prop="stopTime" align="center" label="停工时间(h)" min-width="50">
     </el-table-column>
     <el-table-column prop="debugTime" align="center" label="调试时间(h)" min-width="50">
     </el-table-column>
 
    <el-table-column align="center" label="查看" min-width="210">
     <template slot-scope="scope">
     <el-button  type="primary" size="mini" @click="profile(scope.row)" v-show="SXTbatshow">时序图</el-button>
     <el-button  type="danger" size="mini" @click="cartogram(scope.row)">状态时长统计图</el-button>
     <el-button  type="success" size="mini" @click="diagram(scope.row)">状态占比图</el-button>
     </template>
    </el-table-column>
    </el-table>

在script要写的代码：

// 表格总计的时间
 getSummaries(param) {
  const { columns, data } = param;
  /* console.log(1234)
  console.log(param) */ 
  const sums = [];
  columns.forEach((column, index) => {
   if (index === 0) {
   sums[index] = '总计';
   return;
   }
   //this.closeList等等是后台返回的总的数据，然后取值到这里
   switch(column.property) {
   case "closeTime":
   sums[index] = this.closeList + ' h' 
   break;
   case "machiningTime":
   sums[index] = this.machiningTimeList + ' h'
   break;
   case "stopTime":
   sums[index] = this.stopTimeList + ' h' 
   break;
   case "debugTime":
   sums[index] = this.debugTimeList + ' h' 
   break;
   default:
   break;
   }
  });

  return sums;
  },

效果图：