如何从angular上传mp3文件？

<input type="file" (change)="onFileSelected($event)">
<button (click)="uploadFile()">上传</button>

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

@Component({
  selector: 'app-upload',
  templateUrl: './upload.component.html',
  styleUrls: ['./upload.component.css']
})
export class UploadComponent {
  selectedFile: File;

  constructor(private http: HttpClient) { }

  onFileSelected(event: any) {
    this.selectedFile = event.target.files[0];
  }

  uploadFile() {
    const formData = new FormData();
    formData.append('file', this.selectedFile);

    this.http.post('http://your-server-url/upload', formData)
      .subscribe(response => {
        console.log('文件上传成功');
      }, error => {
        console.error('文件上传失败');
      });
  }
}

const express = require('express');
const multer = require('multer');

const app = express();
const upload = multer({ dest: 'uploads/' });

app.post('/upload', upload.single('file'), (req, res) => {
  // 处理上传的文件，例如保存到服务器或存储到数据库
  console.log(req.file);
  res.send('文件上传成功');
});

app.listen(3000, () => {
  console.log('服务器已启动');
});