save project

fdsf

 while Ture:
-    for event 
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+    for event in pygame.event.get():
+        if event.type == locals.QUIT:
+           # 接收退出事件后退出程序
+           exit()
+x+=30
+position.append((x,y))
+position.pop(0)
+# 将背景图画上去
+screen.blit(background,(0,0))
+# 将贪吃蛇画上去
+screen.blit(right,position[-1])
+# 将
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