Method removeItem

packages/fairygui/src/widgets/PopupMenu.ts:231–239

* Remove item by name * 通过名称移除菜单项

(name: string)

     * 通过名称移除菜单项
     */
    public removeItem(name: string): boolean {
        const item = this._list.getChild(name);
        if (item) {
            const index = this._list.getChildIndex(item);
            this._list.removeChildToPoolAt(index);
            return true;
        }
        return false;
    }

    /**
     * Clear all items