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Subscription为订阅者的基类,里面提供了所有可以回调的方法。另外还提供了Subscriber和Action两个子类可供需求的不同进行选择
Subscriptions为Subscription的容器类,当你定义了多个Subscription时,可以通过Subscriptions进行统一的管理,比如统一取消订阅。