save project

snake.py

@@ -49,7 +49,7 @@ while True:
             if event.key == locals.K_DOWN and setheading != "up":
                 setheading = 'down'
                 snake_head = down
-
+            
     # 设置贪吃蛇的头部坐标
     if setheading == "right":
         x += 30
@@ -69,6 +69,8 @@ while True:
         score=score+10
     else:    
         position.pop(0)
+    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))
     # 将贪吃蛇的头画上去