在春天从模型和视图下载文件

  const downloadBtn = document.getElementById('download-btn');

  downloadBtn.addEventListener('click', () => {
    fetch('/download-file')
      .then(response => response.blob())
      .then(blob => {
        const url = window.URL.createObjectURL(blob);
        const a = document.createElement('a');
        a.href = url;
        a.download = 'filename.ext';
        a.click();
      });
  });
</script>

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

app.get('/download-file', (req, res) => {
  const filePath = '/path/to/file';
  fs.readFile(filePath, (err, data) => {
    if (err) {
      res.status(500).send('Error reading file');
    } else {
      res.setHeader('Content-disposition', 'attachment; filename=filename.ext');
      res.setHeader('Content-type', 'application/octet-stream');
      res.send(data);
    }
  });
});

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

SELECT * FROM files WHERE id = 1;