如何在服务器(Express.js)上接收使用FormData发送的文件？

npm install multer

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

// 配置存储引擎和文件存储路径
const storage = multer.diskStorage({
  destination: function (req, file, cb) {
    cb(null, 'uploads/')  // 上传的文件将存储在uploads/目录下
  },
  filename: function (req, file, cb) {
    cb(null, file.fieldname + '-' + Date.now() + path.extname(file.originalname))
  }
});

// 创建Multer对象
const upload = multer({ storage: storage });

// 设置静态文件目录
app.use(express.static('public'));

// 处理上传的文件
app.post('/upload', upload.single('file'), (req, res) => {
  if (req.file) {
    res.json({
      success: true,
      message: '文件上传成功'
    });
  } else {
    res.json({
      success: false,
      message: '文件上传失败'
    });
  }
});

<form action="/upload" method="post" enctype="multipart/form-data">
  <input type="file" name="file">
  <input type="submit" value="上传">
</form>