Alex教程每一P的教程原代码加上我自己的理解初步理解写的注释，可供学习Alex教程的人参考
此代码仅为较上一P有所改变的代码

【Unity教程】从0编程制作类银河恶魔城游戏_哔哩哔哩_bilibili

 Clone_Skill.cs

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

public class Clone_Skill : Skill
{
    [Header("Clone Info")]
    [SerializeField] private GameObject clonePrefab;//克隆原型
    [SerializeField] private float cloneDuration;//克隆持续时间
    [SerializeField] private bool canAttack;// 判断是否可以攻击
    
    public void CreateClone(Transform _clonePosition)//传入克隆位置
    {
        GameObject newClone = Instantiate(clonePrefab);//创建新的克隆//克隆 original 对象并返回克隆对象。
        //https://docs.unity3d.com/cn/current/ScriptReference/Object.Instantiate.html

        newClone.GetComponent<Clone_Skill_Controller>().SetupClone(_clonePosition,cloneDuration,canAttack);//调试clone的位置,同时调试克隆持续时间
                                                                                                 //Controller绑在克隆原型上的，所以用GetComponents，
                                                                                                
    }
    
}

Clone_Skill_Controller.cs

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

//Clone_Skill_Controller是绑在Clone体上的也就是Prefah上的
public class Clone_Skill_Controller : MonoBehaviour
{
    private Animator anim;//声明animator
    private SpriteRenderer sr;//定义Sr
    [SerializeField] private float colorLoosingSpeed;//加速消失时间 

    private float cloneTimer;//定时器
    [SerializeField]private Transform attackCheck;
    [SerializeField] private float attackCheckRadius = .8f;
    private Transform closestEnemy;

    private void Awake()
    {
        sr = GetComponent<SpriteRenderer>();//拿到Sr
        anim = GetComponent<Animator>();//拿到anim
    }
    private void Update()
    {
        cloneTimer -= Time.deltaTime;

        if(cloneTimer < 0)
        {
            sr.color = new Color(1, 1, 1,sr.color.a-(Time.deltaTime * colorLoosingSpeed));//设置sr消失
        }
        if(sr.color.a<0)
        {
            Destroy(gameObject);
        }
    }
    public void SetupClone(Transform _newTransform,float _cloneDuration,bool _canAttack)
    {
        if(_canAttack)
        {                                     
            anim.SetInteger("AttackNumber", Random.Range(1, 3));//返回[minInclusive..maxInclusive]（范围包括在内）内的随机浮点值。如果minInclusive大于maxInclusive，则数字会自动交换。
        }                                                       //Random.Range()//https://docs.unity3d.com/cn/current/ScriptReference/Random.Range.html
        transform.position = _newTransform.position;//这个函数实现了将克隆出来的对象的位置与Dash之前的位置重合的效果
        cloneTimer = _cloneDuration;
        FaceCloseTarget();
    }

    private void AnimationTrigger()
    {
        cloneTimer = -.1f;
    }
    private void AttackTrigger()
    {
        Collider2D[] colliders = Physics2D.OverlapCircleAll(attackCheck.position, attackCheckRadius);//创建一个碰撞器组，保存所有圈所碰到的碰撞器
        //https://docs.unity3d.com/2022.3/Documentation/ScriptReference/Physics2D.OverlapCircleAll.html
        foreach (var hit in colliders)//https://blog.csdn.net/m0_52358030/article/details/121722077
        {
            if (hit.GetComponent<Enemy>() != null)
            {
                hit.GetComponent<Enemy>().Damage();
            }
        }
    }

    private void FaceCloseTarget()
    {
        Collider2D[] colliders = Physics2D.OverlapCircleAll(transform.position, 25);//找到环绕自己的所有碰撞器

        float closestDistance = Mathf.Infinity;//正无穷大的表示形式（只读）
        //https://docs.unity3d.com/cn/current/ScriptReference/Mathf.Infinity.html
        foreach(var hit in colliders)
        {
            if(hit.GetComponent<Enemy>()!=null)
            {
                float distanceToEnemy = Vector2.Distance(transform.position, hit.transform.position);//拿到与敌人之间的距离
                if(distanceToEnemy < closestDistance)//比较距离，如果离得更近，保存这个敌人的位置,更改最近距离
                {
                    closestDistance = distanceToEnemy;
                    closestEnemy = hit.transform;
                }
            }
        }

        if(closestEnemy != null)
        {
            if(transform.position.x>closestEnemy.position.x)//敌人在左面，转一圈
            {
                transform.Rotate(0,180,0);
            }
        }

    }
}