07http请求

写好四个“这个”就能获取数据

//app.module.ts中去注册
import {HttpClientModule} from '@angular/common/http'//这个
@NgModule({
  ...
  imports: [
    BrowserModule,
    HttpClientModule//这个
  ]
  ...
})

//app.component.ts配置
import {HttpClient} from '@angular/common/http'//这个
export class AppComponent {
  constructor(public http:HttpClient){}//这个
  ngOnInit(){
     var url:string = "http://localhost:8000/top250";
     this.http.get(url).subscribe(res=>{
       console.log(res)
     })
  }
}