普通单例类

public class NormalSingleton<T> where T:class,new()
{
    private static T _single;

    public static T Single
    {
        get
        {
            if (_single==null)
            {
                T t = new T();
                if(t is MonoBehaviour)
                {
                    Debug.LogError("Mono类请使用MonoSingleton");
                    return null;
                }
                _single = t;
            }
            return _single;
        }
    }
}