如何在间隔后更新数值的angular2中使其可观察？

import { Component, OnInit } from '@angular/core';
import { Observable, interval } from 'rxjs';

@Component({
  selector: 'app-your-component',
  templateUrl: './your-component.component.html',
  styleUrls: ['./your-component.component.css']
})
export class YourComponent implements OnInit {
  value: number;

  ngOnInit() {
    // 使用interval创建一个Observable，每隔1秒发出一个递增的数值
    const observable = interval(1000);

    // 订阅Observable，获取更新的数值
    observable.subscribe((num: number) => {
      this.value = num;
    });
  }
}

<p>当前数值：{{ value }}</p>