DEP0163:channel.subscribe(onMessage), channel.unsubscribe(onMessage)

类型：撤销弃用

¥Type: Deprecation revoked

这些方法已被弃用，因为如果用户未强引用这些方法，则使用这些方法可能会导致通道对象容易被垃圾回收。弃用已被撤销，因为当通道对象现在具有活跃订阅者时，它们将无法被垃圾回收。

¥These methods were deprecated because their use could leave the channel object vulnerable to being garbage-collected if not strongly referenced by the user. The deprecation was revoked because channel objects are now resistant to garbage collection when the channel has active subscribers.