Angular2 - 如何在组件中链接异步服务调用（http 请求）

# Angular 2中的异步服务调用与组件链接

typescript
// app.module.ts
import { HttpClientModule } from '@angular/common/http';
@NgModule({
  declarations: [
    // 组件声明
  ],
  imports: [
    // 其他模块导入
    HttpClientModule,
  ],
  bootstrap: [AppComponent],
})
export class AppModule {}

typescript
// data.service.ts
import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs';
@Injectable({
  providedIn: 'root',
})
export class DataService {
  private apiUrl = 'https://api.example.com/data';
  constructor(private http: HttpClient) {}
  getData(): Observable {
    return this.http.get(this.apiUrl);
  }
}

typescript
// app.component.ts
import { Component, OnInit } from '@angular/core';
import { DataService } from './data.service';
@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css'],
})
export class AppComponent implements OnInit {
  data: any;
  constructor(private dataService: DataService) {}
  ngOnInit(): void {
    this.loadData();
  }
  loadData(): void {
    this.dataService.getData().subscribe(
      (response) => {
        this.data = response;
      },
      (error) => {
        console.error('Error fetching data:', error);
      }
    );
  }
}