如何在Angular组件文件中获取订阅对象的索引？

import { Subscription } from 'rxjs';

subscriptions: Subscription[] = [];
currentIndex: number;

this.subscriptions.push(subscription);

this.currentIndex = this.subscriptions.indexOf(subscription);

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

@Component({
  selector: 'app-example',
  templateUrl: './example.component.html',
  styleUrls: ['./example.component.css']
})
export class ExampleComponent implements OnInit, OnDestroy {
  subscriptions: Subscription[] = [];
  currentIndex: number;

  constructor() { }

  ngOnInit() {
    // 示例订阅对象
    const subscription = new Subscription();
    this.subscriptions.push(subscription);

    // 获取订阅对象的索引
    this.currentIndex = this.subscriptions.indexOf(subscription);
  }

  ngOnDestroy() {
    // 在组件销毁时取消订阅
    this.subscriptions.forEach(subscription => subscription.unsubscribe());
  }
}