上传js接口文件上传

<input type="file" id="fileInput">
<button onclick="uploadFile()">上传文件</button>

<script>
function uploadFile() {
    const fileInput = document.getElementById('fileInput');
    const file = fileInput.files[0];
    const formData = new FormData();
    formData.append('file', file);

    fetch('/upload', {
        method: 'POST',
        body: formData
    }).then(response => response.json())
      .then(data => console.log(data))
      .catch(error => console.error('Error:', error));
}
</script>

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

const app = express();

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

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