Ionic和AngularFire2:如何从FireStore文档中检索数据？

npm install firebase @angular/fire --save

export const firebaseConfig = {
  apiKey: "YOUR_API_KEY",
  authDomain: "YOUR_AUTH_DOMAIN",
  databaseURL: "YOUR_DATABASE_URL",
  projectId: "YOUR_PROJECT_ID",
  storageBucket: "YOUR_STORAGE_BUCKET",
  messagingSenderId: "YOUR_MESSAGING_SENDER_ID"
};

import { AngularFireModule } from '@angular/fire';
import { AngularFireDatabaseModule } from '@angular/fire/database';
import { firebaseConfig } from './firebase.config';

@NgModule({
  declarations: [/* ... */],
  imports: [
    /* ... */
    AngularFireModule.initializeApp(firebaseConfig),
    AngularFireDatabaseModule
  ],
  /* ... */
})
export class AppModule { }

import { Component } from '@angular/core';
import { AngularFireDatabase } from '@angular/fire/database';

@Component({
  selector: 'app-home',
  templateUrl: 'home.page.html',
  styleUrls: ['home.page.scss'],
})
export class HomePage {
  constructor(private afDatabase: AngularFireDatabase) {}

  getDataFromFirestore() {
    this.afDatabase.object('collection/document').valueChanges().subscribe(data => {
      console.log(data);
    });
  }
}