你好,我得到这样的错误是什么原因?
StaticInjectorError [Http]:StaticInjectorError [Http]:NullInjectorError:没有Http的提供者!在tryResolveToken(core.js:1153)的resolveToken(core.js:1211)的NullInjector.get(core.js:923)中,在resolveToken(core.js)的StaticInjector.get(core.js:1024)处输入代码。 1211)在tryResolveToken(core.js:1153),在resolveNgModule.ep(core.js:1024)的resolveNgModuleDep(core.js:10585),在NgModuleRef.get(core.js:11806),在resolveDep(core.js:12302) )
import { Injectable } from '@angular/core' import {Todo} from './Todo'
import {Http, Response,Headers,RequestOptions} from '@angular/Http' import {Observable} from 'rxjs/Observable' import 'rxjs/add/operator/do' import 'rxjs/add/operator/catch' import 'rxjs/add/operator/map'
@Injectable() export class TodoService{
constructor(private http: Http){}
todoUrl = "https://jsonplaceholder.typicode.com/todos";
getTodos():Observable{ return this.http.get("https://jsonplaceholder.typicode.com/todos") .map((res:Response)=>res.json()) .do(data=>console.log("TODOS LIST")) } }
尝试在app.module.ts中导入HttpClientModule
import { HttpClientModule } from '@angular/common/http';
你没有在HttpModule
中导入NgModule
(也许你是app.module.ts)> imports