save project

snake.py

@@ -71,7 +71,8 @@ while True:
         score+=20
         score+=20
     else:
     else:
         staion.pop(0)
         staion.pop(0)
-        
+        if x<0 or x>630 or y<0 or y>450:
+            exit()
     # 将背景图画上去
     # 将背景图画上去
     screen.blit(background, (0, 0))
     screen.blit(background, (0, 0))
     # 将贪吃蛇画上去
     # 将贪吃蛇画上去