unity 技能按键冷却

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
public class Skill : MonoBehaviour
{
    public float SkillTime=5;
    private float SkillTimeNow=5;
    private bool SkillCanShow=true;
    public Image Image;
    // Start is called before the first frame update
    void Start()
    {
        
    }
    private void TimeNow() 
    {
        Image.fillAmount = SkillTimeNow / SkillTime;
        if (SkillTimeNow >= 5)
        {
            SkillCanShow = true;
        }
        else
        {
            SkillTimeNow += Time.deltaTime;
            SkillCanShow = false;
        }
    }
    public void OnSikll() 
    {
  if (SkillCanShow==true)
  {
            if (Input.GetKeyDown(KeyCode.Alpha1))
            {
                SkillCanShow = false;
                SkillTimeNow = 0;
            }
        }
 
    }
    // Update is called once per frame
    void Update()
    {
        TimeNow();
        OnSikll();
    }
}