如何从Ionic 3 PWA调用HTTP请求？

import { HttpClientModule } from '@angular/common/http';

@NgModule({
  imports: [
    HttpClientModule,
    // 其他模块
  ],
  // 其他配置
})
export class AppModule { }

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';

@Injectable({
  providedIn: 'root'
})
export class ApiService {
  private apiUrl = 'https://api.example.com'; // 替换为实际的API地址

  constructor(private http: HttpClient) { }

  public getData() {
    return this.http.get(`${this.apiUrl}/data`);
  }

  public postData(data: any) {
    return this.http.post(`${this.apiUrl}/data`, data);
  }

  // 其他HTTP请求方法（如PUT、DELETE等）
}

import { Component } from '@angular/core';
import { ApiService } from './api.service';

@Component({
  selector: 'app-home',
  template: `
    <button (click)="getData()">获取数据</button>
    <button (click)="postData()">提交数据</button>
  `
})
export class HomeComponent {
  constructor(private apiService: ApiService) { }

  public getData() {
    this.apiService.getData().subscribe((response) => {
      console.log(response);
    });
  }

  public postData() {
    const data = { name: 'John Doe' }; // 替换为实际的数据
    this.apiService.postData(data).subscribe((response) => {
      console.log(response);
    });
  }
}