Question

我正尝试第一次从Cloud Firestore接收数据，但是我没有收到任何错误也没有任何输出..请帮助这是输出的屏幕截图，除了屏幕上的一个点外，我什么也没收到。

我没有在这里使用服务，而是在组件本身中调用了

html文件

 <ul>
   <li class="text" *ngFor="let item of items | async">{{item.name}}</li>
 </ul>

.ts文件

import { Component } from '@angular/core';
import { AngularFirestore } from '@angular/fire/firestore';
import { Observable } from 'rxjs';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  items: Observable<any[]>;

  constructor(db: AngularFirestore){
    this.items = db.collection('items').valueChanges();
  }
}

app.module.ts

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';
import { AngularFireModule } from '@angular/fire';
import { AngularFirestoreModule ,FirestoreSettingsToken} from '@angular/fire/firestore';
import { AngularFireStorageModule } from '@angular/fire/storage';
import { AngularFireAuthModule } from '@angular/fire/auth';
import { environment } from '../environments/environment';

@NgModule({
  declarations: [
    AppComponent
    ],
  imports: [
    BrowserModule,
    AngularFireModule.initializeApp(environment.firebase,'asd'),
    AngularFirestoreModule,  // imports firebase/firestore, only needed for database features
    AngularFireAuthModule,   // imports firebase/auth, only needed for auth features,
    AngularFireStorageModule // imports firebase/storage only needed for storage features
  ],
  providers: [
    { provide: FirestoreSettingsToken, useValue: {} }
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }

从Cloud Firestore检索数据

0 个答案: