save project

snake.py

@@ -67,7 +67,8 @@ while True:
     # 将贪吃蛇的身体画上去
     for i in range(len(position)-1):
         screen.blit(body, position[i])
-
+    if x < 0 or x > 630 or y < 0 or y 450
+    exit()
     # 将果实画上去
     screen.blit(food, (360, 300))
     # 刷新画面