希望能提供访问GLoader[_content2]内容的官方api

class GLoader extends GObject {
_content: MovieClip;
private _url;
private _align;
private _verticalAlign;
private _autoSize;
private _fill;
private _shrinkOnly;
private _showErrorSign;
private _playing;
private _frame;
private _color;
private _contentItem;
private _contentSourceWidth;
private _contentSourceHeight;
private _contentWidth;
private _contentHeight;
private _container;
private _errorSign;
private _content2;
private _updatingLayout;
private static _errorSignPool;
constructor();
dispose(): void;
url: string;
icon: string;
align: AlignType;
verticalAlign: VertAlignType;
fill: LoaderFillType;
shrinkOnly: boolean;
autoSize: boolean;
playing: boolean;
frame: number;
color: cc.Color;
fillMethod: FillMethod;
fillOrigin: FillOrigin;
fillClockwise: boolean;
fillAmount: number;
showErrorSign: boolean;
readonly component: GComponent;
texture: cc.SpriteFrame;
protected loadContent(): void;
protected loadFromPackage(itemURL: string): void;
protected loadExternal(): void;
private onLoaded;
protected freeExternal(texture: cc.SpriteFrame): void;
protected onExternalLoadSuccess(texture: cc.SpriteFrame): void;
protected onExternalLoadFailed(): void;
private setErrorState;
private clearErrorState;
private updateLayout;
private clearContent;
protected handleSizeChanged(): void;
protected handleAnchorChanged(): void;
protected handleGrayedChanged(): void;
hitTest(globalPt: cc.Vec2): GObject;
getProp(index: number): any;
setProp(index: number, value: any): void;
setup_beforeAdd(buffer: ByteBuffer, beginPos: number): void;
}