如何使用ajax调用下载excel？

<button id="downloadBtn">下载Excel</button>

<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script>
  $(document).ready(function() {
    $('#downloadBtn').click(function() {
      $.ajax({
        url: '/download-excel', // 后端接口地址
        type: 'GET',
        success: function(response) {
          // 下载文件
          var downloadLink = document.createElement('a');
          downloadLink.href = response.fileUrl;
          downloadLink.download = 'excel.xlsx';
          downloadLink.click();
        },
        error: function(error) {
          console.log(error);
        }
      });
    });
  });
</script>

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

app.get('/download-excel', (req, res) => {
  // 生成Excel文件并保存到服务器临时目录
  const filePath = '/path/to/excel.xlsx';

  // 返回文件路径给前端
  res.json({ fileUrl: filePath });
});

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