Unity 实现鼠标滑过UI时触发动画的操作

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
public class OnBtnEnter : MonoBehaviour, IPointerEnterHandler,IPointerExitHandler
{
    //鼠标进入按钮触发音效和动画
    public void OnPointerEnter(PointerEventData eventData)
    {
      //  AudioManager.audioManager.PlayEnterAudio();//这里可以将播放触发提示音放在这里，没有可以提示音可以将该行注释掉
        if (gameObject.GetComponent<Animation>()!=null) {
            if ( gameObject.GetComponent<Animation>() .isPlaying) {
                return;
            }
            gameObject.GetComponent<Animation>().wrapMode = WrapMode.Loop;
            gameObject.GetComponent<Animation>().Play();
        }
    }
//鼠标离开时关闭动画
    public void OnPointerExit(PointerEventData eventData)
    {
        if ( gameObject.GetComponent<Animation>() != null )
        {
            if ( gameObject.GetComponent<Animation>().isPlaying )
            {
                gameObject.GetComponent<Animation>().wrapMode = WrapMode.Once;
                return;               
            }
            gameObject.GetComponent<Animation>().Stop();
        }
    }
}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;//使用text，image组件
public class eventTriggrtTest : MonoBehaviour { 
    public Image image;
    float ColorAlpha = 0f;//图片透明程度
    public float speed = 0.75f;
 
    bool flag = false;
    private void Start()
    {
        image.GetComponent<Image>().color = new Color(255, 255, 255, ColorAlpha);
    }
    void Update()
    {
    //    Debug.Log("OnMouseEnter");
        if(flag == true)
        {
            if (ColorAlpha <= 0.75)
            {
                ColorAlpha += Time.deltaTime * speed;
                image.GetComponent<Image>().color = new Color(255, 255, 255, ColorAlpha);
            }
 
        }
           Debug.Log(ColorAlpha);
    }
    public void OnMouseEnter()
    {
        flag = true;
    }
    public void OnMouseExit()
    {
        //    Debug.Log("OnMouseExit");
        flag = false;
            ColorAlpha = 0;
            image.GetComponent<Image>().color = new Color(255, 255, 255, ColorAlpha);       
    }    
}