Angular 2 组件注入服务：“[ts] 属性在该类型上不存在”

Question

我是菜鸟 Angular 2. 我正在开发一个简单的应用程序。我在 Angular 2 应用程序中使用服务时遇到问题。当我想在组件上使用它时，我不能在 ngOnInit() 组件方法上使用 getFavoritos() 服务方法。

节点控制台显示此消息：

ERROR in src/app/favoritos-list/favoritos-list.component.ts(30,31): error TS2339: Property 'getFavoritos' does not exist on type 'typeof FavoritosService'.

这是我的服务：

favoritos.service.ts

import { Settings } from './../settings/settings';
import { Favorito } from './../models/favorito';
import { Injectable } from '@angular/core';
import { Http, Response, Headers } from '@angular/http';
import 'rxjs/add/operator/map' ;
import {Observable} from 'rxjs/Observable';

@Injectable()
export class FavoritosService {

 public url: string;

 constructor(private _http: Http) {
   this.url = Settings.GET_FAVORITOS;
 }

 getFavoritos() {
   return this._http.get(this.url)
      .map( res => res.json()) ;
 }
}

这是我的组件：

favoritos-list.component.ts

import { Favorito } from './../models/favorito';
import { FavoritosService } from './../service/favoritos.service'; 
import { Component, OnInit} from '@angular/core'; 

@Component({
   providers : [FavoritosService], 
   selector: 'app-favoritos-list',
   templateUrl: './favoritos-list.html',
   styleUrls: ['./favoritos.css']
})

export class FavoritosListComponent implements OnInit {
   public title: string;
   public errorMessage;


   constructor(       
      private _favoritoService = FavoritosService;        
   ) {
      this.title = 'Listado de marcadores:';
   }

   ngOnInit() {
      console.log('Favoritos list cargando...');
      this._favoritoService.getFavoritos().subscribe(
         //Compiler doesn't recognize getFavoritos()            
         result => {
            console.log(result);
         },
         error => {
            this.errorMessage = <any>error;
            if (this.errorMessage != null) {
                console.log(this.errorMessage);
                alert('Error en la petición');
            }
         }
     );
  }
 }

提前致谢

Answer 1

我在这个 link 中找到了解决方案：

https://www.reddit.com/r/Angular2/comments/6ovswj/property_get_does_not_exist_on_type_typeof/

在我放置的组件构造函数上：

private _favoritoService = FavoritosService;

而不是：

private _favoritoService : FavoritosService;

我习惯用 Angular 2 个插件（如 TSLint）编写 Visual Studio 代码。我很惊讶这个IDE在这一行

中没有显示任何错误

Angular 2 组件注入服务：“[ts] 属性在该类型上不存在”

Angular 2 component inject service: "[ts] Property doesn't exist on the type"

angular2-services

angular2-injection

angular2-components

Angular 2 组件注入服务：“[ts] 属性 在该类型上不存在”

Angular 2 component inject service: "[ts] Property doesn't exist on the type"

angular2-services

angular2-injection

angular2-components

Angular 2 组件注入服务：“[ts] 属性在该类型上不存在”