Angular5到Angular6：Property 'map' does not exist on type 'ObservableResponse'.

错误原因：angular6不再支持原来的Http，用HttpClient代替了原来的Http

解决方案：

1. import

import {Http, Headers, Response} from '@angular/http';

改为=>

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

2.constructor

constructor(private httpService: Http) {}

改为=>

constructor(private httpClient: HttpClient) {}

3.具体用法

const headers = new Headers({'Content-Type': 'application/json','x-access-token': localStorage.getItem('token') ? localStorage.getItem('token') : ''});return this.httpService.get(environment.baseUrl + 'users/myheadshot',{headers: headers}).map((response: Response) => {return response.json();});

改为=>

const headers = new HttpHeaders({'Content-Type': 'application/json','x-access-token': localStorage.getItem('token') ? localStorage.getItem('token') : ''});return this.httpClient.get<any>(environment.baseUrl + 'users/myheadshot', {headers: headers});

注意：在换成httpClient后，必须指定返回类型，不然会报错，返回类型紧接get/post...之后，用尖括号括起来，比如httpClient.get<any>，当不知道返回类型是什么时，用any。