js页面数据实时刷新数据库

// 使用 WebSocket 示例
const socket = new WebSocket('ws://example.com/socket');

socket.onmessage = function(event) {
    const data = JSON.parse(event.data);
    // 更新页面内容
    document.getElementById('data').innerText = data.content;
};

socket.onerror = function(error) {
    console.error('WebSocket Error:', error);
};

const express = require('express');
const http = require('http');
const WebSocket = require('ws');

const app = express();
const server = http.createServer(app);
const wss = new WebSocket.Server({ server });

wss.on('connection', function connection(ws) {
    ws.on('message', function incoming(message) {
        console.log('received: %s', message);
    });

    // 模拟数据更新
    setInterval(() => {
        ws.send(JSON.stringify({ content: 'New Data' }));
    }, 5000);
});

server.listen(3000, function() {
    console.log('Server is listening on port 3000');
});