element table的表头插槽

<el-table :data="listData" border fit highlight-current-row height="419">
  <el-table-column type="index"></el-table-column>
     <el-table-column :key="item.key" v-for="(item) in listDatacolumns" :label="item.text" :width="item.width"  show-overflow-tooltip>
       <template slot-scope="scope">
         <span class="report-text">{{scope.row[item.key]}}</span>
       </template>
     </el-table-column>
   </el-table>

listData: [],
listDatacolumns: [{
          key: "name"，
          text: '姓名，
          width: 160
        },
        {
          key: "sex"，
          text: '性别’，
          width: 170
        },
        {
          key: "age",
          text: '年龄‘，
          width: 160
        },
        {
          key: "height，
          text: “身高”，
          width: 150
        }
     ],