iTween是一个动画库,作者创建它的目的就是最小的投入实现最大的产出.让你做开发更轻松,用它可以轻松实现各种动画,晃动,旋转,移动,褪色,上色,控制音频等等(iTween is a free, open-source project. As such, it doesn't require any purchase or licensing to be used on commercial projects or otherwise)