Angular 6:如何将用户名和密码传递给API？

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

constructor(private http: HttpClient) { }

sendCredentials(username: string, password: string) {
  // 创建HTTP请求的头部
  const headers = new HttpHeaders({
    'Content-Type': 'application/json'
  });

  // 创建要发送的数据对象
  const data = {
    username: username,
    password: password
  };

  // 发送POST请求
  this.http.post('API的URL', data, { headers: headers }).subscribe(response => {
    // 处理响应
    console.log(response);
  }, error => {
    // 处理错误
    console.error(error);
  });
}