save project

snake.py

@@ -64,8 +64,11 @@ while True:
         num2=random.randint(0,16)
         apple_x=num1*30-30
         apple_y=num2*30-30
+        score+=100
     else:
         position.pop(0)
+    if x<0 or x>660 or y<0 or y>480:
+        exit()
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去