如何从blob/formdata写入节点服务器上的音频文件

// 创建一个FormData实例
const formData = new FormData();
formData.append('audio', blob); // 'audio'是服务器端接收时的字段名，blob是音频文件的Blob对象

// 发送POST请求到服务器
fetch('/upload', {
  method: 'POST',
  body: formData
}).then(response => response.json())
  .then(data => console.log(data))
  .catch(error => console.error('Error:', error));

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

const app = express();
const upload = multer({ dest: 'uploads/' }); // 设置上传文件的存储目录

app.post('/upload', upload.single('audio'), (req, res) => {
  if (!req.file) {
    return res.status(400).send('No file uploaded.');
  }

  // 将上传的临时文件移动到目标目录
  const targetPath = `./uploads/${req.file.originalname}`;
  fs.rename(req.file.path, targetPath, err => {
    if (err) return res.status(500).send(err);
    res.send({ message: 'File uploaded successfully', path: targetPath });
  });
});

app.listen(3000, () => console.log('Server started on port 3000'));