Angular订阅/取消订阅最佳实践(Angular subscribe / unsubscribe best practices)

 我目前想知道角度订阅和取消订阅。 关于这个问题有很多东西，所以我在所有这些方面都有点迷失。 
 
 我什么时候应该取消订阅？ 如果我没有退订他们，会怎么样？ 我从来没有遇到过reliquat订阅的任何错误。 
 
 有没有办法自动取消订阅组件/应用程序中的所有内容，这样我就不必通过订阅来声明1个属性了？ 这可能非常烦人： 
 
@Component({
  selector: 'subscriptionTest',
  template: `...`,
})
export class SubTestComponent {
  first;
  second;
  third;

  constructor(private remote: RemoteService){}

  ngOnInit() {
    this.first = remote.getSomeData().subscribe(data => // do something);
    this.second = Observable.interval(500).subscribe(event => // do something);
    this.third = remote.getSomeOtherData().subscribe(data => // do something);

  }

  ngOnDestroy() {
    this.first.unsubscribe();
    this.second.unsubscribe();
    this.third.unsubscribe();
  }

}

I'm currently wondering about angular subscription and unsubscription. There is a lot of stuff on the subject, so I'm a bit lost in all of this.
 
When should I unsubscribe from subscription ? What happens if I don't, ever, unsubscribe from them ? I never encounter any errors from reliquat subscription.
 
Is there a way to auto unsubscribe from everything in a component/app, so that I don't have to declare 1 property by subscription ? This can be very annoying : 
 
@Component({
  selector: 'subscriptionTest',
  template: `...`,
})
export class SubTestComponent {
  first;
  second;
  third;

  constructor(private remote: RemoteService){}

  ngOnInit() {
    this.first = remote.getSomeData().subscribe(data => // do something);
    this.second = Observable.interval(500).subscribe(event => // do something);
    this.third = remote.getSomeOtherData().subscribe(data => // do something);

  }

  ngOnDestroy() {
    this.first.unsubscribe();
    this.second.unsubscribe();
    this.third.unsubscribe();
  }

}

原文：https://stackoverflow.com/questions/47152752