javascript angular4-MOSH-火力-10 11-angular6-angularfire2v5

Posted 2021-05-03

//app.component.html
<ul>
  <li *ngFor="let course of (courses$ | async)">
    {{course}}
  </li>
</ul>
<p>
  {{ (course$ | async | json) }}
</p>

// app.component.ts
import { Component, OnDestroy } from '@angular/core';
import {AngularFireDatabase} from 'angularfire2/database'
import { Observable } from 'rxjs';
export class AppComponent {
  courses$;
  course$;
  
  constructor(db: AngularFireDatabase) {
    this.courses$ = db.list(`/courses`).valueChanges()
   
    this.course$ = db.object(`/courses/1`).valueChanges()
  }
}
// Things fixed for more details: https://stackoverflow.com/a/50884243/4356464