如何在angular中执行订阅后的内容

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

@Component({
  selector: 'app-example',
  template: `
    <button (click)="startSubscription()">开始订阅</button>
  `,
})
export class ExampleComponent implements OnInit {
  ngOnInit() {
    // 创建一个Observable对象
    const observable = new Observable((observer) => {
      // 模拟异步操作
      setTimeout(() => {
        observer.next('订阅后的内容');
        observer.complete();
      }, 2000);
    });

    // 订阅Observable
    observable.subscribe((data) => {
      // 处理订阅后的内容
      console.log(data);
    });
  }

  startSubscription() {
    // 手动触发订阅
    this.ngOnInit();
  }
}