Egret学习-通过缩放实现翻牌效果

// 首先显示牌的背面，然后缩放到0，显示牌的正面，由0到1缩放


 1         // 缩放实现翻牌
        // 牌的背面
        let card_back = Main.createBitmapByName("card_big_back");
        card_back.anchorOffsetX = card_back.width/2
        card_back.x = 200
        card_back.y = 50;
        this.addChild(card_back);

        // 牌的正面
        let card_front = Main.createBitmapByName("card_big_front");
        card_front.anchorOffsetX = card_front.width/2
        card_front.x = 200
        card_front.y = 50;
        
        var twback = egret.Tween.get( card_back );
        twback.wait(1000).to( {scaleX:0}, 300 ).call(()=>{
            card_front.scaleX = 0;
            this.addChild(card_front);
            var twfront = egret.Tween.get( card_front );
            twfront.wait(0).to( {scaleX:1}, 300);
        });