public void Update(EatingComponent e)
 {
     e.go.transform.position = e.GetCurPosition();
     if (Time.time >= e.endTime)
     {
         world.eatings.DelayRemove(e);
         world.gameObjectSystem.Remove(e.go);
     }
 }
    public void CreateFrom(GameObjectComponent gameObject, PositionComponent source, PositionComponent target)
    {
        gameObject.entity.gameObject = null;//解除和原entity的关系

        EatingComponent comp = new EatingComponent();

        comp.go          = gameObject;
        comp.target      = target;
        comp.startOffest = source.value - target.value;
        comp.endOffest   = Vector2.Lerp(source.value, target.value, 0.5f) - target.value;
        comp.Start();
        world.eatings.DelayAdd(comp);
    }