Node.js socket.io前端后端通讯简单例子

来源：互联网发布：python get threshold 编辑：程序博客网时间：2024/06/05 11:40

前端代码：

<!doctype html><html><head>    <style>        * {            margin: 0;            padding: 0;        }        html,        body {            width: 100%;            height: 100%;        }        #box {            position: absolute;            bottom: 0;        }    </style></head><body>    <ul id="message-box"></ul>    <div id="box">        <input id="edit-box" autocomplete="off" /><button id="btn">Send</button>    </div>    <script src="socket.io.js"></script>    <script>        var socket = io();        document.getElementById('btn').onclick = function () {            socket.emit('message', document.getElementById('edit-box').value);            document.getElementById('edit-box').value = '';        };        socket.on('message', function (message) {            var li = document.createElement('li');            li.innerHTML = message;            document.getElementById('message-box').appendChild(li);        });    </script></body></html>

后端代码：

var express = require('express');var app = express();var http = require('http').Server(app);var io = require('socket.io')(http);var path = require('path');app.use(express.static(__dirname));app.get('/', function (request, response) {    response.sendFile(path.join(__dirname, 'index.html'));});io.on('connection', function (socket) {    console.log('a user connected');    socket.on('disconnect', function () {        console.log('user disconnected');    });    socket.on('message', function (message) {        console.log('message: ' + message);        io.emit('message', message);    });});var server = http.listen(4000, function () {    console.log('Sever is running');});

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