[敌人的脚本]

public class Enemy : MonoBehaviour
{
    //属性值
    public float moveSpeed = 3;
    public Vector3 bulletEulerAngle;
    private float v;
    private float h;

    //引用
    private SpriteRenderer sr;
    public Sprite[] tankSprite;
    public GameObject bulletPrefab;
    public GameObject explosionPrefab;

    //计时器
    public float timeVal;
    public float timeValChangeDirection=4;


    private void Awake()
    {
        sr = GetComponent<SpriteRenderer>();
    }
    void Start()
    {

    }
    void Update()
    {
        //攻击的时间间隔
        if (timeVal >= 3)
        {
            Attack();
        }
        else
        {
            timeVal += Time.deltaTime;
        }
    }
    private void FixedUpdate()
    {
        Move();
    }
    //坦克的攻击方法
    private void Attack()
    {
        //子弹产生的角度：当前坦克的角度+子弹应该旋转的角度
        Instantiate(bulletPrefab, transform.position, Quaternion.Euler(transform.eulerAngles + bulletEulerAngle));
        timeVal = 0;
    }
    //坦克的移动方法
    private void Move()
    {
        if (timeValChangeDirection >= 4)
        {
            int num = Random.Range(0, 8);
            if (num > 5)
            {
                v = -1;
                h = 0;
            }
            else if (num==0)
            {
                v = 1;
                h = 0;
            }
            else if (num > 0 && num <= 2)
            {
                h = -1;
                h = 0;
            }
            else if (num > 2 && num <= 4)
            {
                h = 1;
                v = 0;
            }
            timeValChangeDirection = 0;
        }
        else
        {
            timeValChangeDirection += Time.fixedDeltaTime;
        }
        transform.Translate(Vector3.up * v * Time.fixedDeltaTime * moveSpeed, Space.World);
        if (v < 0)
        {
            sr.sprite = tankSprite[2];
            bulletEulerAngle = new Vector3(0, 0, -180);
        }
        else if (v > 0)
        {
            sr.sprite = tankSprite[0];
            bulletEulerAngle = new Vector3(0, 0, 0);
        }
        if (v != 0) return;

        transform.Translate(Vector3.right * h * Time.fixedDeltaTime * moveSpeed, Space.World);
        if (h < 0)
        {
            sr.sprite = tankSprite[3];
            bulletEulerAngle = new Vector3(0, 0, 90);
        }
        else if (h > 0)
        {
            sr.sprite = tankSprite[1];
            bulletEulerAngle = new Vector3(0, 0, -90);
        }

    }
    //坦克的死亡方法
    private void Die()
    {
        Instantiate(explosionPrefab, transform.position, transform.rotation);
        Destroy(gameObject);
    }
}

[Player的攻击脚本]

    public float timeVal;
    public GameObject bulletPrefab;
    void Update()
    {
        if(timeVal >= 0.4f)
        {
            Attack();
        }
        else
        {
            timeVal += Time.deltaTime;
        }
    }
    //坦克的攻击方法
    private void Attack()
    {
        if (Input.GetKey(KeyCode.Space))
        {
            Instantiate(bulletPrefab, transform.position, Quaternion.Euler(transform.eulerAngles + bulletEulerAngle));
            timeVal = 0;
        }
    }

[系统没有报错]