angular2-http

• 提供HTTP服务
  
  • http是angular的HTTP库所提供的一系列服务之一

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

• 注册http服务：把HttpModule添加到AppModule的imports列表中

import { NgModule }      from '@angular/core';import { BrowserModule } from '@angular/platform-browser';import { HttpModule } from '@angular/http';import { AppComponent }  from './app.component';@NgModule({    imports: [         BrowserModule,         HttpModule    ],    declarations: [         AppComponent    ],    bootstrap: [         AppComponent     ],    exports: []})export class AppModule { }

• 使用http.get()获取数据

getHeroes(): Promise<Hero[]> {    return this.http.get(requestUrl)               .toPromise()               .then(response => response.json().data as Hero[])               .catch(this.handleError);  }

• 处理响应对象

//从返回的response中提取数据，通过then的方式提取.then(response => response.json().data as Hero[])