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 title="时序图" type="primary" size="mini" @click="profile(scope.row)" v-show="SXTbatshow">时序图</el-button>
                    <el-button title="状态时长统计图" type="danger" size="mini" @click="cartogram(scope.row)">状态时长统计图</el-button>
                    <el-button title="状态占比图" 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：