问v-treeview -如何以编程方式打开节点？

EN

<v-treeview :items="yourItemsTree" :open.sync="openIds" hoverable>

<v-treeview :items="yourItemsTree" @update:open="onOpen" hoverable>

methods: {
  onOpen(items) {
    this.openIds = items
  }
}

<v-treeview
  :items="yourItemList"
  :open.sync="openNodes"
  return-object
  @update:open="handleOpenOrClose"
  :key="triggerRerender"
>

export default class TreeViewClass extends Vue {
    @Prop({ type: Array, default: () => [] }) public yourItemList!: any[];

    public triggerRerender = 0; // modifying this value will rerender the component.
    public openNodes = [] as any[];
    private actuallyOpenNodes = [] as any[];
    private rerenderCount = 0; // after rerendering, increment this to track if closing a node is due to close action or rerender.

    public handleOpenOrClose(openNodesArray: any[]): void {
        if (openNodesArray.length === 0) {
            if (this.rerenderCount === this.triggerRerender) {
                this.handleClose()
            } else {
                // This is so it doesn't close nodes on rerender.
                this.rerenderCount = this.triggerRerender;
            }
        } else if (openNodesArray.length < this.actuallyOpenNodes.length) {
            this.handleClose()
        } else {
            this.handleOpen(openNodesArray)
        }
    }

    public handleOpen(openNodesArray: any[]): void {
        openNodes.forEach(node => {
            if (this.actuallyOpenNodes.indexOf(node) === -1) {
                this.actuallyOpenNodes.push(node);
            }
        });
    }

    public handleClose(): void {
        this.actuallyOpenNodes.forEach((node, index) => {
            if (this.openNodes.indexOf(node) === -1) {
                this.actuallyOpenNodes.splice(index, 1);
            }
        });
    }

    public updated(): void {
        if (this.openNodes.length !== this.actuallyOpenNodes.length) {
            this.actuallyOpenNodes.forEach(node => {
                if (this.openNodes.indexOf(node) === -1) {
                    this.openNodes.push(node);
                }
            });
        }
    }
}