<!--:append-to-body="false" el-date-picker el-popover也可使用-->
<el-dropdown v-if="editEnable" >
<el-button icon="el-icon-plus"></el-button>
<el-dropdown-menu slot="dropdown" :append-to-body="false">
<el-dropdown-item>新增子分类</el-dropdown-item>
<el-dropdown-item>删除子分类</el-dropdown-item>
</el-dropdown-menu>
</el-dropdown>