* Minimize file size - 缩小文件尺寸 * Minimize the amount of code required to initiate a tween - 减少任务代码 * Tween multiple properties with a single call (including a MovieClip’s volume and color) - 多属性同一代码调用 * Maximize performance - 增强性能 * Build in the ability to call any function when a tween has completed and pass any number of parameters to that function - 完成时事件控制 * Build in the ability to call any function when a tween starts and pass any number of parameters to that function - 初始化事件控制 * Allow the user to set a delay before the tween takes effect (useful when looping through an array and you want to have tweens activate in a sequential way) - 启动时的延迟接口