用c#写一个进入场景渐现1秒之后等待2秒后再渐隐1秒结束后跳转到“场景五”的代码

以下是使用C#编写的代码，可以实现进入场景渐现、等待、渐隐并跳转到指定场景：

using UnityEngine;
using UnityEngine.SceneManagement;

public class SceneTransition : MonoBehaviour
{
    public string sceneName; // 指定跳转的场景名称
    public float fadeInTime = 1.0f; // 渐现时间
    public float waitTime = 2.0f; // 等待时间
    public float fadeOutTime = 1.0f; // 渐隐时间

    private void Start()
    {
        StartCoroutine(Transition());
    }

    private IEnumerator Transition()
    {
        yield return StartCoroutine(FadeIn(fadeInTime)); // 渐现

        yield return new WaitForSeconds(waitTime); // 等待

        yield return StartCoroutine(FadeOut(fadeOutTime)); // 渐隐

        SceneManager.LoadScene(sceneName); // 跳转到指定场景
    }

    private IEnumerator FadeIn(float time)
    {
        CanvasGroup canvasGroup = GetComponent<CanvasGroup>();
        if (canvasGroup == null)
        {
            canvasGroup = gameObject.AddComponent<CanvasGroup>();
        }
        canvasGroup.alpha = 0;
        while (canvasGroup.alpha < 1)
        {
            canvasGroup.alpha += Time.deltaTime / time;
            yield return null;
        }
        canvasGroup.alpha = 1;
    }

    private IEnumerator FadeOut(float time)
    {
        CanvasGroup canvasGroup = GetComponent<CanvasGroup>();
        if (canvasGroup == null)
        {
            canvasGroup = gameObject.AddComponent<CanvasGroup>();
        }
        while (canvasGroup.alpha > 0)
        {
            canvasGroup.alpha -= Time.deltaTime / time;
            yield return null;
        }
        canvasGroup.alpha = 0;
    }
}

将上述代码添加到一个空物体上，并将物体的`CanvasGroup`组件的`alpha`属性设为0，即可实现进入场景渐现、等待、渐隐并跳转到指定场景的效果。注意修改代码中的`sceneName`变量以指定跳转的场景名称。