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如何实现触屏时精灵在原位置开始按触屏方向移动？我“移动到”这个方法会先移动到触屏位置然后再按触屏方向移动。
也就是需要相对移动吧，触屏开始时在触屏位置创建一个透明实例，然后把需要移动的对象绑定到这个透明实例上就行，这是一种比较简单的实现方法
