我正在尝试通过外部api从json数据中获取键值对，并使用angular和typescript显示它。我如何才能做到这一点？

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

@Injectable({
  providedIn: 'root'
})
export class DataService {
  private apiUrl = 'https://example.com/api/data'; // 替换为实际的外部 API 地址

  constructor(private http: HttpClient) { }

  getData(): Observable<any> {
    return this.http.get<any>(this.apiUrl);
  }
}

import { Component, OnInit } from '@angular/core';
import { DataService } from '路径/data.service'; // 替换为实际的服务文件路径

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

  constructor(private dataService: DataService) { }

  ngOnInit(): void {
    this.getData();
  }

  getData(): void {
    this.dataService.getData().subscribe(data => {
      this.data = data;
    });
  }
}

<div *ngIf="data">
  <ul>
    <li *ngFor="let item of data">{{ item.key }}: {{ item.value }}</li>
  </ul>
</div>