[]drawToCanvas无法截取到有子元素。

// test drawToCanvas

        const sp1 = new Sprite();

        sp1.loadImage('bet/cheer_1_3.png');



        const sp2 = new Sprite();

        sp2.x = 100;

        sp2.loadImage('bet/cheer_1_4.png');

        sp1.addChild(sp2);

        this.addChild(sp1);



        const htmlCanvas = sp1.drawToCanvas(640, 200, 0, 0);

        const canvas = htmlCanvas.getCanvas();

        trace(canvas.toDataURL('image/png'));

        const texture = new Laya.Texture(htmlCanvas);

        const sp = new Sprite();

        sp.graphics.drawTexture(texture);

        this.shot.addChild(sp);

        const sp1 = new Laya.Image();

        sp1.skin = 'bet/cheer_1_3.png';

        this.addChild(sp1);



        const htmlCanvas = sp1.drawToCanvas(640, 200, 0, 0);

        const canvas = htmlCanvas.getCanvas();

        trace(canvas.toDataURL('image/png'));

        const texture = new Laya.Texture(htmlCanvas);

        const sp = new Sprite();

        sp.graphics.drawTexture(texture);

        this.shot.addChild(sp);