使用AngularFire2获取对项的引用

import { AngularFireModule } from '@angular/fire';
import { AngularFireDatabaseModule } from '@angular/fire/database';

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',
  appId: 'YOUR_APP_ID'
};

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

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

@Component({
  selector: 'app-root',
  template: `
    <button (click)="getReference()">Get Reference</button>
  `
})
export class AppComponent {
  constructor(private db: AngularFireDatabase) {}

  getReference() {
    const itemRef = this.db.object('path/to/item');
    console.log(itemRef);
  }
}