实例化

GameObject instance =(GameObject)Instantiate(prefab,transform.position,transform.rotation); 目标位置

GameObject instance = (GameObject)Instantiate(obj, new Vector3(0,0,0), transform.rotation); 新位置

销毁

public GameObject SFX_prefab;

GameObject.Destroy(SFX_prefab,2f); // 什么物体,多少时间销毁