public void Move() { player.checkCoords(); background.Move(); player.MovePlane(); ProduceBullet(); ProduceEnemy(); suGun.Move(); box.Move(); if (player.ChangeBlood(0))//玩家血量为0时,敌机不发射子弹 { ProduceEnemyBullet(); } Random rand = new Random(Guid.NewGuid().GetHashCode()); if (0 == rand.Next(500)) { suGun.Exist = true; } if (0 == rand.Next(500)) { box.Exist = true; } }