解决DontDestroyOnload在场景调整中的问题

private static  DontDestroy  _instance;

public static DontDestroy   Instance{

       get

       {

                 return _instance??new GameObject("DontDestroyObj").AddComponent<DontDestroy>();

       }

}

void Awake(){

           if(_instance!=null){

                 Destroy(gameobject);

                 return;

            }

           _instance=this;

          DontDestroyOnLoad(gameobject);

}