save project

snake.py

@@ -44,6 +44,7 @@ while True:
                 setheading = 'down'
                 snake_head = down
     
+
     # 设置贪吃蛇的头部坐标
     if setheading == "right":
         x += 30
@@ -59,7 +60,8 @@ while True:
     else:
         position.pop(0)
     position.append((x, y))
-    
+    if x>630 or x<0 or y>450 or y<0:
+        exit()
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去