save project

snake.py

@@ -60,6 +60,8 @@ while True:
     else:
         zuo.pop(0)  
     zuo.append((x,y))
+    if x<0 or y<0 or x>630 or y>450:
+        exit 
     
     screen.blit(background, (0, 0))
     # 将贪吃蛇画上去