antD——tree组件自定义父子图标及展开/折叠图标

        <!-- 展开/折叠图标 -->
        <a-icon slot="switcherIcon" type="down"/>
        <!-- 父子节点图标 -->
        <a-icon slot="parent" type="plus"/>
        <a-icon slot="child" type="minus"/>

    </a-tree>
</div>