Method getChildByPath

packages/fairygui/src/core/GComponent.ts:223–236

* Get child by path * 通过路径获取子对象

(path: string)

     * 通过路径获取子对象
     */
    public getChildByPath(path: string): GObject | null {
        const arr = path.split('.');
        let obj: GObject | null = this;

        for (const part of arr) {
            if (obj instanceof GComponent) {
                obj = obj.getChild(part);
            } else {
                return null;
            }
        }

        return obj;
    }

    /**
     * Get child index