eltable 根据后台返回数据动态显示列

从后台得到的数据：

titleMap中的数据为表头数据

key是0的对应 dataList 中的C0的值

显示要求

            let listArr = [{}]
            let dataList = res.data.dataList
            let titleMap = res.data.titleMap

            let length = 0;
            for(let ever in titleMap) {
              length++;
            }
            for (let i = 0; i < length; i++){
              let label = "C"+i
              if(titleMap.hasOwnProperty(i)){
                listArr[0][label]= titleMap[i]
              }
            }

            let dataArr = listArr.concat(dataList)            

dataArr 数据如下：

el-table中循环如下：

<el-table id="productTable" :data="dataArr" border style=" 99%" :header-cell-style="tableHeaderColor" :cell-style="cellStyle" show-summary>
                <el-table-column prop="orgName" align="center" label="站点名称"></el-table-column>
                <el-table-column prop="treatmentSum" align="center" label="治疗台次" sortable></el-table-column>

                <el-table-column :label="item" align="center" v-for="(item, index) in dataArr[0]" :key="index">
                    <template slot-scope="scope">
                        <span>{{scope.row[index]}}</span>
                    </template>
                </el-table-column>

            </el-table>

tableHeaderColor({ row, column, rowIndex, columnIndex }) {
        if (rowIndex === 0) {
          return "color: #4f81bd;font-weight: bold ;";
        }
      },
      cellStyle({ row, column, rowIndex, columnIndex }) {
        if (rowIndex === 0) {
          return "display: none;";
        }else {

        }
      },

OK啦！！！！！！