[]使用drawToCanvas截图多次之后，再也无法再本次程序中截图显示。没有任何报错

在播放IDE制作的帧动画之后会出现截图失败的情况

private takePhoto(){

			this._htmlC = this.gridBox.drawToCanvas(this.gridBox.width,this.gridBox.height,0,0);

            //获取截屏区域的texture

            this._tex = new Laya.Texture(this._htmlC);

            this._photo=new Laya.Sprite();

            //将截屏的texture进行draw绘制并显示到舞台

			this._photo.name="testtt";

            this._photo.graphics.drawTexture(this._tex,0,0,this.gridBox.width,this.gridBox.height);

            

		}