save project

snake.py

@@ -65,6 +65,8 @@ while True:
         score+=10
         score+=10
     else:
     else:
         position.pop(0)
         position.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))
     # 将贪吃蛇的头画上去
     # 将贪吃蛇的头画上去