一个卷轴动画的小例子，实现很简单。希望对有志于游戏事业的新手同学有少少帮助就好了.\"A,D,W,S\" 实现 左，右，上，下 移动-a small example of animation to achieve is very simple. Hope interested in the game on the cause of the students have some newcomers to help me. "A, D, W, S" Achieving left,