Method onExternalLoadFailed

packages/fairygui/src/widgets/GLoader.ts:465–467

* Called when external resource failed to load * 外部资源加载失败时调用

()

     * 外部资源加载失败时调用
     */
    protected onExternalLoadFailed(): void {
        this.setErrorState();
    }

    /**
     * Set error state and show error sign