Method setItemVisible

packages/fairygui/src/widgets/PopupMenu.ts:159–165

* Set item visibility by name * 通过名称设置菜单项可见性

(name: string, bVisible: boolean)

     * 通过名称设置菜单项可见性
     */
    public setItemVisible(name: string, bVisible: boolean): void {
        const item = this._list.getChild(name);
        if (item && item.visible !== bVisible) {
            item.visible = bVisible;
            this._list.setBoundsChangedFlag();
        }
    }

    /**
     * Set item grayed state by name