private void OnTriggerEnter(Collider other)
    {
        if (other.gameObject.name != "Monster(Clone)") return;
        //產生爆炸預鑄件
        GameObject node1 = Instantiate(bulletExplosion, null);
        node1.transform.position = this.transform.position;

        //播放爆炸音效
        //注意：爆炸音效要放在爆炸預鑄件prefab，不要放在子彈或主角（因為被destory了，就無法播放音效）
        node1.GetComponent<AudioSource>().Play();

        //銷毀玩家，與怪物
        Destroy(this.gameObject);
        Destroy(other.gameObject);
    }