void OnTriggerEnter2D(Collider2D other)    {               if (other.tag == "Enemy")        {               other.SendMessage("BeHit");            GameObject.Destroy(this.gameObject);        }    }

然后在enemy脚本中添加BeHit方法

public void BeHit(int hp)    {        hp -= 1;        if (hp<=0)        {           // GameObject.Instantiate(enemyExpollusion, transform.position, Quaternion.identity);            GameObject.Destroy(this.gameObject);        }    }