Vue -- element-ui 表头添加按钮

<el-table-column :render-header="renderHeader">
   <template slot-scope="scope">
      {{ scope.row.user }}
   </template>
</el-table-column>

methods: {
    renderHeader(h) {
      return(
         <el-button class="filter-item" type="default" icon="el-icon-delete" onClick={()=>this.handleAddItem()}>操作</el-button>
      )
    },
    handleAddItem() { }
}