参见英文答案 > How to share service between two modules – @NgModule in angular not between to components?5个
> Angular – shared service between components doesn’t work2个
我想使用subject将数据发送到另一个组件(用于赚钱目的).我无法取回数据.这是我的代码：

app.component.ts

@H_404_5@import { Component } from '@angular/core'; import { shareService } from './share.service'; @Component({ selector: 'my-app',template: ` <hello></hello> <button (click)="passData()"> Start </button> `,styleUrls: [ './app.component.css' ],providers:[shareService] }) export class AppComponent { constructor(private service : shareService){} passData(){ this.service.send("hello"); } }

hello.component.ts

@H_404_5@import { Component,Input } from '@angular/core'; import { shareService } from './share.service'; import { Subscription } from 'rxjs/Subscription'; @Component({ selector: 'hello',template: `<h1>Hello!</h1>`,styles: [`h1 { font-family: Lato; }`],providers:[shareService] }) export class HelloComponent { subscription: Subscription; constructor(private share : shareService){ this.subscription = share.subj$.subscribe(val=>{ console.log(val); }) } }

share.service.ts

@H_404_5@import { Injectable } from '@angular/core'; import { Subject } from 'rxjs/Subject'; @Injectable() export class shareService{ private sub = new Subject(); subj$= this.sub.asObservable(); send(value: string) { this.sub.next(value); } }

我没有在控制台中获得价值.

这是工作演示：DEMO