“void”类型上不存在属性“map”。在角度

Question

我开发了一个 Angular 5 和 Ionic 3 应用程序。我使用以下教程。

https://www.techiediaries.com/ionic-3-http-module-rxjs/

但是，我得到以下错误

错误是：“void”类型上不存在属性“map”。

我的代码（文件：remote-service.ts）

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

import {Http ,Response } from '@angular/http';
import 'rxjs/add/operator/do';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/catch';

/*
  Generated class for the RemoteServiceProvider provider.

  See https://angular.io/guide/dependency-injection for more info on providers
  and Angular DI.
*/
@Injectable()
export class RemoteService {

getApiUrl : string = "https://jsonplaceholder.typicode.com/posts";

  constructor(public http: HttpClient) {
    console.log('Hello RemoteServiceProvider Provider');
  }

  getPosts() {

    return  this.http.get(this.getApiUrl)
            .do((res : Response ) => console.log(res.json())
            .map((res : Response ) => res.json())  // <-- error shows here
            .catch(error => console.log(error)));
}


}

Answer 1

你少了一个）

.do((res : Response ) => console.log(res.json()))

最后，要从 httpClient 读取完整响应，必须明确观察：

https://angular.io/guide/http#reading-the-full-response

Answer 2

再次检查您是否从 Angular 而不是 Selenium 导入了 HttpClient 模块。 这样做。

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