如何使用headers和body angular 5进行post调用

import { HttpClient, HttpHeaders } from '@angular/common/http';

constructor(private http: HttpClient) { }

postData(url: string, body: any) {
  const headers = new HttpHeaders({
    'Content-Type': 'application/json' // 设置请求头的Content-Type为JSON
  });

  return this.http.post(url, body, { headers: headers });
}

const url = 'https://example.com/api/endpoint';
const data = { name: 'John', age: 25 };

this.postData(url, data).subscribe(response => {
  console.log(response);
}, error => {
  console.error(error);
});