消息推送系统

const express = require('express');

const fs = require('fs');

const path = require('path');

const app = express();

app.get('/download/:filename', (req, res) => {

const filePath = path.join(__dirname, 'files', req.params.filename);

res.download(filePath);

});

app.listen(3000, () => {

console.log('Server is running on port 3000');

});

]]>

function downloadFile(filename) {

fetch(`http://localhost:3000/download/${filename}`)

.then(response => {

if (!response.ok) throw new Error('Network response was not ok');

return response.blob();

})

.then(blob => {

const url = window.URL.createObjectURL(blob);

const a = document.createElement('a');

a.href = url;

a.download = filename;

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a.click();

})

.catch(error => console.error('There has been a problem with your fetch operation:', error));

}

]]>