如何使排序表与来自firebase的Angular 8+数据一起工作？

npm install firebase

import { Injectable } from '@angular/core';
importimport { AngularFireDatabase } from '@angular/fire/database';
import { Observable } from 'rxjs';

@Injectable({
  providedIn: 'root'
})
export class FirebaseService {
  constructor(private db: AngularFireDatabase) {}

  getData(): Observable<any[]> {
    return this.db.list('data').valueChanges();
  }
}

import { Component, OnInit } from '@angular/core';
import { FirebaseService } from './firebase.service';

@Component({
  selector: 'app-my-component',
  template: `
    <table>
      <thead>
        <tr>
          <th>名称</th>
          <th>值</th>
        </tr>
      </thead>
      <tbody>
        <tr *ngFor="let item of sortedData">
          <td>{{ item.name }}</td>
          <td>{{ item.value }}</td>
        </tr>
      </tbody>
    </table>
  `,
})
export class MyComponent implements OnInit {
  sortedData: any[];

  constructor(private firebaseService: FirebaseService) {}

  ngOnInit() {
    this.firebaseService.getData().subscribe(data => {
      // 在这里对数据进行排序
      this.sortedData = data.sort((a, b) => a.value - b.value);
    });
  }
}