element-ui 列表内单行删除popover弹框实现

<el-table>  
<el-table-column
        align="center"
        label="操作"
        width="100">
        <template slot-scope="scope">
            <el-button type="primary" size="mini" icon="el-icon-edit" @click="changeIcon(scope.row.id)" circle></el-button>
          <el-popover
            ref="popoverDel"
            placement="top-end"
            width="160"
            trigger="click">
            <div >
              <div class="delTip"><i class="el-icon-warning" style="color:#E6A23C"></i>提示</div>
              <p>此操作将永久删除该文件, 是否继续?</p>
              <div style="text-align: center">
                <el-button type="primary" size="mini" @click="delIcon(scope.row.id)">确定</el-button>
              </div>
            </div>
          </el-popover>
            <el-button style="margin-left: 10px" v-popover:popoverDel type="danger" size="mini" icon="el-icon-delete" circle></el-button>
        </template>
      </el-table-column>
  </el-table>  

关键：ref="popoverDel"和 v-popover:popoverDel