将代码添加到要控制的坦克身上，添加刚体、碰撞体

public class TankMove : MonoBehaviour
{
    [Header("炮弹的预设体")]
    public GameObject bulletPrefab;
    [Header("移动速度")]
    public float moveSpeed = 1;
    [Header("转身速度")]
    public float turnSpeed = 1f;
    [Header("敌人预设体")]
    public GameObject tankPrefab;
    public float emptyShuaXinTime = 5f;

    //炮弹发射点对象的Transform
    private Transform firePoint;
    float hor, ver;
    bool fire;

    private void Awake()
    {
        //找到炮弹发射点
        firePoint = transform.Find("FirePoint");
    }

    private void Update()
    {
        hor = Input.GetAxis("Horizontal");
        ver = Input.GetAxis("Vertical");

        fire = Input.GetButtonDown("Fire");

        //前后移动
        transform.position +=
            transform.right * ver
           * moveSpeed;
        //左右转身
        transform.eulerAngles +=
            Vector3.up * hor * turnSpeed;

        if (fire)
        {
            //生成炮弹
            GameObject blt = Instantiate(
                bulletPrefab,
                firePoint.position,
                Quaternion.identity);
            //让子弹飞
            blt.GetComponent<Bullet>().moveDir = transform.right;
            //3s后销毁
            Destroy(blt, 3f);
        }
        emptyShuaXinTime -= Time.deltaTime;    //生成敌人
        if (emptyShuaXinTime < 0)
        {
            GameObject empty = Instantiate(tankPrefab);
            Vector3 weiZhi = new Vector3(Random.Range(0, 500), 0, Random.Range(0, 500));
            while ((weiZhi - transform.position).sqrMagnitude < 400f)
            {
                weiZhi = new Vector3(Random.Range(0, 500), 0, Random.Range(0, 500));
            }
            empty.transform.position = new Vector3(Random.Range(0, 500), 0, Random.Range(0, 500));
            empty.transform.Rotate(new Vector3(0, Random.Range(0, 360), 0));
            emptyShuaXinTime = 3f;
            empty.transform.position += new Vector3(1,0,0);
        }
        
    }
    void OnCollisionEnter(Collision collisionInfo)
    {
        if (collisionInfo.gameObject.tag == "paoDan")
        {
            Debug.Log("GameOver");
        }
    }
}