词汇概念

Subject:

  1. A Subject is a special type of Observable that allows values to be multicasted to many Observables.
  2. Subjects are like EventEmitters
  3. Every Subject is an Observable and an Observer
  4. You can subscribe to a Subject and you can call next to feed values as well as error and complete.


Subject extends Observable implements SubscriptionLike

multicast [ˈmʌltikɑːst] : to send data across a computer network to several users at the same time / 多点传送

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