Unity/My project/Assets/script/NewBehaviourScript.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class NewBehaviourScript : MonoBehaviour
{

    Transform cube;
    Vector3 p1;
    Vector3 p2;
    // Start is called before the first frame update
    void Start()
    {
        Debug.Log("²Ý˵£º¡°Å£±Æ¡±");
        GameObject cube = GameObject.Find("Cube123");
        p1 = cube.transform.position;
        p2 = this.gameObject.transform.position; 

        Application.targetFrameRate = 60;
        this.transform.LookAt(cube.transform);

    }

    // Update is called once per frame
    void Update()
    {
    
        if ((p2 - p1).magnitude > 2f)
        {
            p2 = this.transform.position;
            this.transform.Translate(0, 0, 1 * Time.deltaTime, Space.Self);
        } else
        {
            this.transform.position += new Vector3(0, 0, 0.01f);
            this.transform.LookAt(cube.transform);
        }
    }
}