save project

snake.py

@@ -62,7 +62,8 @@ while True:
     else:
         position.pop(0)
     position.append((x, y))
-    
+    if x>630 or x<0 or y<0 or y>450:
+        exit()
 
     # 将背景图画上去
     screen.blit(background, (0, 0))
@@ -79,4 +80,4 @@ while True:
     screen.blit(text,(540,10))
     # 刷新画面
     pygame.display.update()
-    FPSCLOCK.tick(3)
\ No newline at end of file
+    FPSCLOCK.tick(10)
\ No newline at end of file