7 发送http请求

angular 中自带的有http请求
//app.module.ts中去注册
import {HttpClientModule} from '@angular/common/http'
@NgModule({
  ...
  imports: [
    BrowserModule,
    HttpClientModule
  ]
  ...
})
//app.component.ts配置
import {HttpClient} from '@angular/common/http'
export class AppComponent {
  constructor(public http:HttpClient){}
  ngOnInit(){
     var url:string = "http://localhost:8000/top250";
     this.http.get(url).subscribe((res:any)=>{
       console.log(res)
     })
  }
}
api:http://a.itying.com/api/productlist