In this lesson we are going to learn how to use AngularFire 2 to query objects, and read them from the Firebase realtime database.
const course$: FirebaseObjectObservable<any> = af.database.object(‘courses/-KT0LsbuhHZGr5F4v7OV‘); course$.subscribe((c)=> { console.log("c", JSON.stringify(c, null, 2)) });
[AngularFire 2] Object Observables - How to Read Objects from a Firebase Database?
原文：http://www.cnblogs.com/Answer1215/p/5929489.html