Destroy reall destroy ?!

最近做战斗逻辑的时候发现一个问题

测试脚本mTest：

public class mTest : MonoBehaviour
{
public mTest2 tmp2;

void OnGUI()
{
if (GUI.Button(new Rect(10, 150, 150, 100), "first click"))
{
Destroy(tmp2);
}

if (GUI.Button(new Rect(10, 10, 150, 100), "second click after first click some seconds"))
{
Debug.Log(" tmp2 == null : " + (tmp2 == null)); ///output : true

Debug.Log(tmp2.value);

tmp2.Test();
///output : test ///why !?

Debug.Log(tmp2.name);
///output : MissingReferenceException: The object of type 'mTest2' has been destroyed but you are still trying to access it.
///Your script should either check if it is null or you should not destroy the object.
}
}

}

测试脚本mTest2：

public class mTest2 : MonoBehaviour
{
public string value = "11";
public void Test() { Debug.Log("test"); }
}

奇怪的问题,如下解决：

if (GUI.Button(new Rect(10, 150, 150, 100), "first click"))
{
Destroy(tmp2);
tmp2 = null;
}

完全百思不得其解，已经是Null了，为什么还能调用其方法呢？u3d的bug吧，估计。

所以以后我们要引用一个物体，销毁是我们调用的，那么最好设置一下引用为null。