save project

snake.py

@@ -62,8 +62,10 @@ while True:
         num2=random.randint(1,16)
         apple_x=num1*30-30
         apple_y=num2*30-30
+        score += 10
     else:    
         position.pop(0)
+    if x < 0 or x  > 630 or y < 0 or y >  450:
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去