angular2.0封装http请求服务,拿不到返回结果?

Question

app.module.ts

import {HttpModule}from '@angular/http';
import {Demo26Component} from './demo26_http/demo26.component';
import {MyHttpService} from './demo26_http/myhttp.service';
@NgModule({
    imports: [HttpModule,BrowserModule, FormsModule, AppRoutingModule],
     declarations: [Demo26Component],
     bootstrap: [AppComponent],
     providers:[MyHttpService]
})
export class AppModule { }

app.router.ts

import { Demo26Component } from './demo26_http/demo26.component';
const routes: Routes = [
      { path: '', redirectTo: '/demo26', pathMatch: 'full' },
      { path: 'demo26', component: Demo26Component },\
]
@NgModule({    i
    mports: [RouterModule.forRoot(routes)],
    exports: [RouterModule]
})
export class AppRoutingModule { }

demo26.component.ts

import {Component,OnInit} from '@angular/core';
import{MyHttpService} from './myhttp.service';
@Component({
    selector:'demo26',
    template:`
        <h2>demo26,封装http请求的封装<h2>
        <button (click)="handleClick()">加载更多</button>
    `
})
export class Demo26Component implements OnInit{
    //myList:Array<any>=[];
    myList:any[]=[];
    constructor(private myService:MyHttpService){}
    ngOnInit(){}
     handleClick(){
         //向服务器发请求
         console.log(1111);
          this.myService.sendRequest('http://jsonplaceholder.typicode.com/users').subscribe((result:any)=>{
              console.log(result);
          })
     }
}

myhttp.service.ts

import {Injectable}from '@angular/core';
import {Http,Response} from '@angular/http';
import {Observable} from 'rxjs/Observable';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/catch';
@Injectable()
export class MyHttpService{
    constructor(private http:Http){}
    //定义了一个方法是向myUrl对应的服务器端发送请求
    sendRequest(myUrl:string){
        return this.http.get(myUrl)
            .map((response: Response) => {
                response.json();
        })
    }
}

请问下,为何拿不到返回结果, 控制台输出结果是undefined.

Answer 1

试试这样return this.http.get(myUrl).pipe(     map((response: Response) => {         response.json();     }));我不明白为什么你的http get返回的Observable类型还能有map方法