如何在启动Angular应用程序之前获取提供者数据

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs';

@Injectable({
  providedIn: 'root'
})
export class ProviderService {
  constructor(private http: HttpClient) { }

  getProviderData(): Observable<any> {
    return this.http.get<any>('http://example.com/api/provider');
  }
}

import { Component, OnInit } from '@angular/core';
import { ProviderService } from 'path/to/provider.service';

@Component({
  selector: 'app-my-component',
  templateUrl: './my-component.component.html',
  styleUrls: ['./my-component.component.css']
})
export class MyComponent implements OnInit {
  providerData: any;

  constructor(private providerService: ProviderService) { }

  ngOnInit(): void {
    this.providerService.getProviderData().subscribe(data => {
      this.providerData = data;
    });
  }
}

<ul>
  <li *ngFor="let provider of providerData">
    {{ provider.name }} - {{ provider.description }}
  </li>
</ul>