如何在Angular中返回JSON响应的单个属性？

// 在 Angular 的服务中

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

@Injectable({
  providedIn: 'root'
})
export class DataService {
  private apiUrl = 'http://example.com/api/data'; // 后端 API 地址

  constructor(private http: HttpClient) { }

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

// 在 Angular 的组件中

import { Component, OnInit } from '@angular/core';
import { DataService } from './data.service';

@Component({
  selector: 'app-example',
  template: `
    <div>{{ singleProperty }}</div>
  `,
  styleUrls: ['./example.component.css']
})
export class ExampleComponent implements OnInit {
  singleProperty: any;

  constructor(private dataService: DataService) { }

  ngOnInit(): void {
    this.dataService.getSingleProperty().subscribe(
      (response: any) => {
        this.singleProperty = response.propertyName; // 使用点操作符获取单个属性值
      },
      (error: any) => {
        console.error(error);
      }
    );
  }
}