/// <summary>
/// 由FSMSystem控制的 update() 检测状态是否需要转变
/// </summary>
public void DoUpdate(GameObject npc, GameObject target)
{
Transition trans = currentState.CheckTranstition();
if (trans != Transition.NullTransition)
{
PerformTransition(trans);
}
currentState.DoUpdate(npc, target);
}
