如何将数据从angular 6传递到Nodejs？

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

@Component({
  selector: 'app-root',
  template: `
    <input [(ngModel)]="data" placeholder="Enter data">
    <button (click)="sendData()">Send Data</button>
  `,
})
export class AppComponent {
  data: string;

  constructor(private dataService: DataService) {}

  sendData() {
    this.dataService.sendData(this.data).subscribe(
      response => {
        console.log('Data sent successfully');
      },
      error => {
        console.error('Error sending data:', error);
      }
    );
  }
}

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

@Injectable({
  providedIn: 'root'
})
export class DataService {
  private apiUrl = 'http://localhost:3000/data'; // Node.js服务器的URL

  constructor(private http: HttpClient) {}

  sendData(data: string) {
    return this.http.post(this.apiUrl, { data });
  }
}

// 使用Express框架
const express = require('express');
const router = express.Router();

// 处理POST请求
router.post('/data', (req, res) => {
  const data = req.body.data;
  // 在这里执行逻辑操作，如将数据存储到数据库
  res.send('Data received');
});

module.exports = router;

const express = require('express');
const bodyParser = require('body-parser');
const app = express();

// 解析请求体
app.use(bodyParser.json());

// 引入路由处理程序
const dataRouter = require('./routes/data');
app.use(dataRouter);

// 启动服务器
app.listen(3000, () => {
  console.log('Server started on port 3000');
});