UGUI 制作角色受伤屏幕变红的动画提示

using UnityEngine;  
using System.Collections;  
using UnityEngine.UI;  
public class PlayerDamageAnim : MonoBehaviour ｛  
    public Image damage_Image;  
    public Color flash_Color;  
    public float flash_Speed = 5;  
    bool damaged = false;  
    // Update is called once per frame  
    void Update () ｛  
        //测试的输入代码段  
        if(Input.GetMouseButtonDown(0))｛  
            TakeDamage();  
        ｝  
        PlayDamagedEffect ();  
    ｝  
    /// <summary>  
    /// 角色受伤后的屏幕效果  
    /// </summary>  
    void PlayDamagedEffect()｛  
        if (damaged) ｛  
            damage_Image.color = flash_Color;  
        ｝ else ｛  
            damage_Image.color = Color.Lerp(damage_Image.color,Color.clear,flash_Speed * Time.deltaTime);  
        ｝  
        damaged = false;  
    ｝  
    /// <summary>  
    /// 角色受伤  
    /// </summary>  
    public void TakeDamage()｛  
        damaged = true;  
    ｝  
｝