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

Sword_Skill.cs

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

public class Sword_Skill : Skill
{
    [Header("Skill Info")]
    [SerializeField] private GameObject swordPrefab;//sword预制体
    [SerializeField] private Vector2 launchDir;//发射方向
    [SerializeField] private float swordGravity;//发射体的重力

    public void CreateSword()
    {
        GameObject newSword = Instantiate(swordPrefab,player.transform.position,transform.rotation);
        Sword_Skill_Controller newSwordScript = newSword.GetComponent<Sword_Skill_Controller>();
        newSwordScript.SetupSword(launchDir, swordGravity);
    }
}

Sword_Skill_Controller.cs

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

public class Sword_Skill_Controller : MonoBehaviour
{
    private Animator anim;
    private Rigidbody2D rb;
    private CircleCollider2D cd;
    private Player player;

    private void Awake()
    {
        anim = GetComponentInChildren<Animator>();
        rb = GetComponent<Rigidbody2D>();
        cd = GetComponent<CircleCollider2D>();
    }
    public void SetupSword(Vector2 _dir,float _gravityScale)
    {
        rb.velocity = _dir;
        rb.gravityScale = _gravityScale;
    }
}

SkillManager.cs

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

public class SkillManager : MonoBehaviour
{
    public static SkillManager instance;

    public Dash_Skill dash { get; private set; }
    public Clone_Skill clone { get; private set; }
    public Sword_Skill sword { get; private set; }
    private void Awake()
    {
        if (instance != null)
        {
            Destroy(instance.gameObject);
        }
        else
            instance = this;
    }
    private void Start()
    {
        dash = GetComponent<Dash_Skill>();
        clone = GetComponent<Clone_Skill>();
        sword = GetComponent<Sword_Skill>();
    }
}

Skill.cs

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

public class Skill : MonoBehaviour
{
    [SerializeField] protected float cooldown;
    protected float cooldownTimer;

    protected Player player;//拿到player

    protected virtual void Start()
    {
        player = PlayerManager.instance.player;//拿到player
    }
    protected virtual void Update()
    {
        cooldownTimer -= Time.deltaTime;
    }

    public virtual bool CanUseSkill()
    {
        if (cooldownTimer < 0)
        {
            UseSkill();
            cooldownTimer = cooldown;
            return true;
        }
        else
        {
            Debug.Log("Skill is on cooldown");
            return false;
        }

    }
    public virtual void UseSkill()
    {
        // do some skill thing
    }


}

PlayerAnimationTrigger.cs

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

public class playerAnimationTriggers : MonoBehaviour
{
    private Player player => GetComponentInParent<Player>();//获得夫组件上的实际存在的Player组件
    private void AnimationTrigger()
    {
        player.AnimationTrigger();
    }
    private void AttackTrigger()
    {
        Collider2D[] colliders = Physics2D.OverlapCircleAll(player.attackCheck.position, player.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 ThrowSword()
    {
        SkillManager.instance.sword.CreateSword();
    }
}