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

Crystal_Skill_Controller

using System.Collections;
using System.Collections.Generic;
using UnityEngine;public class Crystal_Skill_Controller : MonoBehaviour
{private Animator anim => GetComponent<Animator>();private CircleCollider2D cd => GetComponent<CircleCollider2D>();private float crystalExitTimer;private bool canExplode;private bool canMove;private float moveSpeed;private bool canGrow;private float growSpeed = 5;public void SetupCrystal(float _crystalDuration,bool _canExplode,bool _canMove,float _moveSpeed){crystalExitTimer = _crystalDuration;canExplode = _canExplode;canMove = _canMove;moveSpeed = _moveSpeed;}private void Update(){crystalExitTimer -= Time.deltaTime;if (crystalExitTimer < 0){FinishCrystal();}if (canGrow)transform.localScale = Vector2.Lerp(transform.localScale, new Vector2(3, 3), growSpeed * Time.deltaTime);}private void AnimationExplodeEvent(){Collider2D[] colliders = Physics2D.OverlapCircleAll(transform.position, cd.radius);foreach(var hit in colliders){if (hit.GetComponent<Enemy>() != null)hit.GetComponent<Enemy>().Damage();}}public void FinishCrystal(){if (canExplode){canGrow = true;anim.SetBool("Explode",true);}else{SelfDestory();}}public void SelfDestory() => Destroy(gameObject);
}

Crystal_Skill

using System.Collections;
using System.Collections.Generic;
using UnityEngine;public class Crystal_Skill : Skill
{[SerializeField] private GameObject crystalPrefab;[SerializeField] private float crystalDuration;private GameObject currentCrystal;[Header("Explosive crystal")][SerializeField] private bool canExplode;[Header("Moving crystal")][SerializeField] private bool canMoveToEnemy;[SerializeField] private float moveSpeed;public override bool CanUseSkill(){return base.CanUseSkill();}public override void UseSkill(){base.UseSkill();if (currentCrystal == null){currentCrystal = Instantiate(crystalPrefab, player.transform.position, Quaternion.identity);Crystal_Skill_Controller currentCrystalScripts = currentCrystal.GetComponent<Crystal_Skill_Controller>();currentCrystalScripts.SetupCrystal(crystalDuration,canExplode,canMoveToEnemy,moveSpeed);}    else{Vector2 playerPos = player.transform.position;player.transform.position = currentCrystal.transform.position;currentCrystal.transform.position = playerPos;currentCrystal.GetComponent<Crystal_Skill_Controller>()?.FinishCrystal();}}protected override void Start(){base.Start();}protected override void Update(){base.Update();}
}