如何使用Angular检索firebase数据库内容的所有id？

import { Component } from '@angular/core';
import { AngularFireDatabase } from '@angular/fire/database';

@Component({
  selector: 'app-your-component',
  templateUrl: './your-component.component.html',
  styleUrls: ['./your-component.component.css']
})
export class YourComponent {
  constructor(private db: AngularFireDatabase) { }
}

getIds() {
  this.db.list('your-collection').valueChanges().subscribe(data => {
    const ids = data.map(item => item.id);
    console.log(ids);
  });
}