Angular上的post请求问题

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

@Injectable({
  providedIn: 'root'
})
export class DataService {
  constructor(private http: HttpClient) { }

  postData(url: string, data: any) {
    return this.http.post(url, data);
  }
}

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

@Component({
  selector: 'app-root',
  template: `
    <button (click)="postData()">Send Post Request</button>
  `
})
export class AppComponent {
  constructor(private dataService: DataService) { }

  postData() {
    const url = 'https://example.com/api';
    const data = { name: 'John', age: 30 };

    this.dataService.postData(url, data).subscribe(
      response => {
        console.log('Post request successful', response);
      },
      error => {
        console.error('Post request failed', error);
      }
    );
  }
}