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

PlayerPrimaryAttack.cs

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

public class PlayerPrimaryAttack : PlayerState
{
    //p38 2.从ground进入

    private int comboCounter;

    private float lastTimeAttacked;//距离上一次攻击的时间
    private float comboWindow = 2;//可以间隔的时间
    public PlayerPrimaryAttack(Player _player, PlayerStateMachine _stateMachine, string _animBoolName) : base(_player, _stateMachine, _animBoolName)
    {
    }

    public override void Enter()
    {
        base.Enter();
        if(comboCounter >2||Time.time>comboWindow+lastTimeAttacked)//当计数器超过2和间隔时间大于window时，进入第一个攻击动作
        {
            comboCounter = 0;
        }
        Debug.Log(comboCounter);
        player.anim.SetInteger("ComboCounter", comboCounter);//设置animtor里的comboCounter
    }

    public override void Exit()
    {
        base.Exit();
        comboCounter++;
        lastTimeAttacked = Time.time;
    }

    public override void Update()
    {
        base.Update();
        if(triggerCalled)
        {
            stateMachine.ChangeState(player.idleState);
        }
    }
}