此程序主要使用了一个事件结构，通过检测“按下键”来执行相应的分支，对应上下左右四个键，分别用了四个条件结构分支，在框图内分别编写了相对应的操作。具体实现盘的移动，是通过改变所显示的图片完成的-The procedure uses the structure of an event, by detecting the " press key"　to perform the appropriate branch, corresponding to the four key up and down, respectively, with the structure of a branch of the four conditions, and written in the diagram corresponds to the operation. Specific movement of the disk is shown in the picture by changing the completion of