简单的聊天室
基于express+socket.io
express框架直接安裝后得到模板
這是socket官網的例子： https://socket.io/get-started/chat
/*** Module dependencies.*/ var app = require('../app'); var debug = require('debug')('server:server'); var http = require('http'); const { Server } = require("socket.io"); const users = {};/*** Get port from environment and store in Express.*/var port = normalizePort(process.env.PORT || '8888'); app.set('port', port); /*** Create HTTP server.*/var server = http.createServer(app); // 解決跨域問題 const io = new Server(server, {allowEIO3: true,cors: {origin: "*", // from the screenshot you providedmethods: ["GET", "POST"]} });io.on('connection', (socket) => {// 可以發送初始化消息 ---- socket.on('username', (username) => {// 用對應的 socked.id 將用戶姓名存入users[socket.id] = username// 廣播給所有的用戶socket.broadcast.emit('welcome', `歡迎<span>${username}</span>來到聊天室`);// 傳送自己socket.emit('welcome', `歡迎<span>${username}</span>來到聊天室`);})socket.on('chat message', (msg) => {socket.broadcast.emit('message', `${users[socket.id]}:${msg}`);socket.emit('message', `${users[socket.id]}:${msg}`);}); });/*** Listen on provided port, on all network interfaces.*/ server.listen(port); server.on('error', onError); server.on('listening', onListening);/*** Normalize a port into a number, string, or false.*/function normalizePort(val) {var port = parseInt(val, 10);if (isNaN(port)) {// named pipereturn val;}if (port >= 0) {// port numberreturn port;}return false; }/*** Event listener for HTTP server "error" event.*/function onError(error) {if (error.syscall !== 'listen') {throw error;}var bind = typeof port === 'string'? 'Pipe ' + port: 'Port ' + port;// handle specific listen errors with friendly messagesswitch (error.code) {case 'EACCES':console.error(bind + ' requires elevated privileges');process.exit(1);break;case 'EADDRINUSE':console.error(bind + ' is already in use');process.exit(1);break;default:throw error;} }/*** Event listener for HTTP server "listening" event.*/function onListening() {var addr = server.address();var bind = typeof addr === 'string'? 'pipe ' + addr: 'port ' + addr.port;debug('Listening on ' + bind); };module.exports = iohtml 文件
<!DOCTYPE html> <html><head><title>Socket.IO chat</title><style>body {margin: 0;padding-bottom: 3rem;font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;}#form {background: rgba(0, 0, 0, 0.15);padding: 0.25rem;position: fixed;bottom: 0;left: 0;right: 0;display: flex;height: 3rem;box-sizing: border-box;backdrop-filter: blur(10px);}#input {border: none;padding: 0 1rem;flex-grow: 1;border-radius: 2rem;margin: 0.25rem;}#input:focus {outline: none;}#form>button {background: #333;border: none;padding: 0 1rem;margin: 0.25rem;border-radius: 3px;outline: none;color: #fff;}#messages {list-style-type: none;margin: 0;padding: 0;}#messages>li {padding: 0.5rem 1rem;}#messages>li:nth-child(odd) {background: #efefef;}.hint {height: 20px;line-height: 20px;font-size: 16px;color: #333;}.hint span {color: red;}</style> </head><body><ul id="messages"></ul><form id="form"><input id="input" autocomplete="off" /><button>Send</button></form><!-- ./node_modules/socket.io/socket.io.js --><script src="http://localhost:8888/socket.io/socket.io.js"></script><script>var socket = io('http://localhost:8888');// 獲取用戶名稱const username = prompt('請輸入您的名稱')var form = document.getElementById('form');var input = document.getElementById('input');const messages = document.getElementById('messages');class Message {add(msg, cls) {messages.innerHTML += `<li class=${cls}>${msg}</li>`}}const message = new Message()// 向服務器發送用戶名稱socket.emit('username', username);form.addEventListener('submit', function (e) {e.preventDefault();if (input.value) {socket.emit('chat message', input.value);input.value = '';}});socket.on('message', (msg) => {message.add(msg)})socket.on('welcome', (msg) => {console.log('觸發自己')message.add(msg, 'hint')})</script> </body></html>總結
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