帧动画的实现

        var animation = new cc.Animation();

        for (var i = 1; i < 15; i++) {

            var frameName = "Images/grossini_dance_" + ((i < 10) ? ("0" + i) : i) + ".png";

            animation.addSpriteFrameWithFile(frameName);

        }

        animation.setDelayPerUnit(2.8 / 14);

        animation.setRestoreOriginalFrame(true);

        var action = cc.animate(animation);

        this._grossini.runAction(cc.sequence(action, action.reverse()));