Angular 5 StaticInjectorError：[Http]

Question

你好，我得到这样的错误是什么原因？

StaticInjectorError [Http]：StaticInjectorError [Http]：NullInjectorError：没有Http提供程序！在tryResolveToken（core.js：1153）的resolveToken（core.js：1211）的NullInjector.get（core.js：923）处在resolveToken（core.js :)的StaticInjector.get（core.js：1024）输入代码1211）在tryResolveToken（core.js：1153）在StaticInjector.get（core.js：1024）在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")) } }

Answer 1

试图导入HttpClientModule在app.module.ts

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