private void Start()
{
//Originator originator = new Originator();
//originator.SetState("State1");
//originator.ShowState();
//Memento memento = originator.CreatMemento();//创建快照
//originator.SetState("State2");
//originator.ShowState();
//originator.SetMemento(memento);
//originator.ShowState();
CareTaker careTaker = new CareTaker(); //多备忘录保存管理器
Originator originator = new Originator(); //发起者（内部有需要保存的类成员）
originator.SetState("State1"); //状态1
originator.ShowState();
careTaker.AddMemento("v1.0", originator.CreatMemento());
originator.SetState("State2");//状态2
originator.ShowState();
careTaker.AddMemento("v2.0", originator.CreatMemento());
originator.SetState("State3");//状态3
originator.ShowState();
careTaker.AddMemento("v3.0", originator.CreatMemento());
originator.SetMemento(careTaker.GetMemento("v2.0"));//回到版本2
originator.ShowState();
originator.SetMemento(careTaker.GetMemento("v1.0"));//回到版本1
originator.ShowState();
}