游蛇吃豆游戏设计
一、 基本要求（必做）
（1）键盘控制改变游蛇运动方向。
（2）碰到边框或栅栏游戏结束。
（3）吃掉豆子蛇身变长
（4）豆子全部吃光，游戏结束。
-snakes eat beans a game design, the basic requirements (regimen) (1) control of the keyboard to change snakes directions. (2) encounter frame or fence the end of the game. (3) eat the beans Snake-Body variable length (4) beans all gone, the end of the game.
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