Observables

An exciting new feature used with Angular is the Observable. This isn't anAngular specific feature, but rather a proposed standard for managingasync data that will be included in the release of ES7. Observables open up acontinuous channel of communication in which multiple values of data can beemitted over time. From this we get a pattern of dealing with data by usingarray-like operations to parse, modify and maintain data. Angular usesobservables extensively - you'll see them in the HTTP service and the eventsystem.

原文: https://angular-2-training-book.rangle.io/handout/observables/