save project

snake.py

@@ -20,6 +20,7 @@ while True:
             # 接收到退出事件后退出程序
             exit()
     # x+30将背景图画上去
+    x+=30
     screen.blit(background, (0, 0))
     # 将贪吃蛇画上去
     screen.blit(right, (x, y))