Resource.UnloadAsset卸载资源的小知识

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先上代码：

Object o;

GameObject go;

void Start()

{

    o = Resource.Load("pic");

    go = (GameObject)Instantiate(o);

    StartCoroutine(WaitAndPrint(2.0F));

}

IEnumerator WaitAndPrint(float time)

{

    yield return new WaitForSeconds(time);

    Resource.UnloadAsset(o);

}

今天在测试资源卸载的时候,报了一个错：

UnloadAsset may only be used on individual assets and can not be used on  </