如何在angular 7中从json文件中检索数据

{
  "employees": [
    {
      "id": 1,
      "name": "John Doe",
      "position": "Developer"
    },
    {
      "id": 2,
      "name": "Jane Smith",
      "position": "Designer"
    }
  ]
}

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

@Injectable({
  providedIn: 'root'
})
export class DataService {
  private dataUrl = 'assets/data.json';

  constructor(private http: HttpClient) { }

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

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

@Component({
  selector: 'app-root',
  template: `
    <h1>Employees</h1>
    <ul>
      <li *ngFor="let employee of employees">
        {{ employee.name }} - {{ employee.position }}
      </li>
    </ul>
  `
})
export class AppComponent implements OnInit {
  employees: any[];

  constructor(private dataService: DataService) { }

  ngOnInit() {
    this.dataService.getData().subscribe(data => {
      this.employees = data.employees;
    });
  }
}