一、引用

//app.module.ts
import {HttpClientModule} from '@angular/common/http'

二、注册

//app.module.ts
imports: [
    BrowserModule,
    AppRoutingModule,
    HttpClientModule
  ],

三、在组件中使用http

1.先引用

例如在content组件中使用

//content.component.ts
import{HttpClient} from '@angular/common/http'

2.注册

constructor(public http:HttpClient) { 
  }

3.使用

ngOnInit() {
    var url:string="https://music.aityp.com/top/playlist?cat=日语"
    this.http.get(url).subscribe(res=>{
      console.log(res)
    })
  }