Question

在main.ts

import { HTTP_PROVIDERS } from '@angular/http';
import { AppComponent } from './app.component';

bootstrap(AppComponent,[HTTP_PROVIDERS]);

在employee.service.ts

中

import { Injectable }     from '@angular/core';
import { Http, Response } from '@angular/http';
import {Employee} from '../classes/employee';
import { Observable }     from 'rxjs/Observable';

@Injectable()
export class EmployeeService{
  constructor(private http: Http){
      this.http = http;
  }
}

即使在调用构造函数后，我也将http视为未定义。

请帮助...........

Answer 1

这是工作http://plnkr.co/edit/ymvo2AmnkpyWvcnJLMKC?p=preview

首先，使用@Injectable（）标记您的服务，以便Angular运行时知道它应该由DI进行管理。

@Injectable()
export class EmployeeService{
  constructor(private http: Http){
      this.http = http;
  }
}

其次，请确保您不要忘记将 HTTP_PROVIDERS 引导至您的应用：

import {HTTP_PROVIDERS} from '@angular/http';

...

bootstrap(AppComponent, [HTTP_PROVIDERS, EmployeeService]);

请参阅https://angular.io/docs/ts/latest/guide/dependency-injection.html#!#injectable

无法阅读财产＆＃39; get＆＃39;未定义的角度2

1 个答案: