public class FollowPlayer : MonoBehaviour

 {

     public Transform Player;

     private Vector3 Offset;

    void Start()

     {

     //设置差值

       Offset= Player.position - transform.position;

     }

    void Update()

     {

         transform.position = Player.position - Offset;

     }

 }

public class FollowPlayer : MonoBehaviour {

    public Transform Player;

    private Vector3 Offset;

    private int Speed = ;

    void Start()

    {

        Offset = Player.position - transform.position;

    }

    void Update()

    {

        //调整相机与玩家之间的距离

        transform.position = Vector3.Lerp(transform.position, Player.position - Offset, Speed * Time.deltaTime);

    }

}