A reference to another filter inside a reference. Users should generally not be aware that they are using this class, but it is used heavily by "filterSet"
另一个过滤器内部参考的参考。用户一般应该不会意识到他们正在使用这个类,但它是大量使用"filterSet"
类的对象----------Objects from the Class----------
Objects are generally not created by users so there is no constructor function.
对象一般不会由用户创建的,所以不存在构造函数。
插槽----------Slots----------
name: The R name of the referenced filter
name:ŕ引用的过滤器名称
env: The environment where the filter must live
env:过滤器必须生活环境
filterId: The filterId, not really used since you always resolve
filterId:filterId,没有真正使用,因为你总是解决