动画点播器:可以播放动画资源,通过组合框选择要播放的动画,将播放后的动画添加到已播放列表框中,进度条显示已播放的动画比例.双击列表框中的项目,可以将该项目从列表框内取消.-animation on demand : can play animation resources, through a combination of choice to play the fr a me of animation, will be broadcast after the animation has been