本文介绍了node.js 用socket实现聊天的示例代码，分享给大家，也给自己留个笔记，具体如下：
服务器搭建
app.js
const http = require("http");const express = require("./express");//创建一个服务const server = http.createServer(express);//监听服务端口server.listen(8001,()=>{ console.log("服务端已经启动,请访问 http://localhost:8001");}); express.js
const url=require("url");const fs=require("fs");function express(req,res){ var urlObj=url.parse(req.url); //console.log(urlObj); var filePath="./www"+urlObj.pathname; var content="not found"; if(fs.existsSync(filePath)){ content=fs.readFileSync(filePath); } res.end(content.toString());}module.exports=express; index.html
<!DOCTYPE html><html lang="en"> <head> <meta charset="utf-8"/> <title>Socket.IO chat</title> <style> * { margin: 0; padding: 0; box-sizing: border-box; } body { font: 13px Helvetica, Arial; } form { background: #000; padding: 3px; position: fixed; bottom: 0; width: 100%; } form input { border: 0; padding: 10px; width: 90%; margin-right: .5%; } form button { width: 9%; background: rgb(130, 224, 255); border: none; padding: 10px; } #messages { list-style-type: none; margin: 0; padding: 0; } #messages li { padding: 5px 10px; } #messages li:nth-child(odd) { background: #eee; } </style> </head> <body> <ul id="messages"></ul> <form action=""> <input id="m" autocomplete="off" /><button>Send</button> </form> <script src="js/lib/jquery-1.11.1.js"></script> <script src="js/lib/socket.io.js"></script> <script src="js/index.js"></script> </body></html> 客户端服务搭建与服务端通信
我们要建立服务端socket请求连接
io.on('connection', function(socket){ console.log('a user connected'); //断开连接 socket.on('disconnect', function(){ console.log('user disconnected'); });}); index.js
//客户端建立连接 var socket = io(); 客户端向服务端发送请求index.js$('form').submit(function(){ //触发事件 socket.emit('chat message', $('#m').val()); $('#m').val(''); return false; }); app.js
//接收客户端的信息socket.on('chat message', function(msg){ console.log('message: ' + msg);}); 将服务端的数据广播到客户端去
socket.on('chat message', function(msg){ console.log('message: ' + msg); socket.broadcast.emit("clientE",msg); }); 客户端接收服务端广播出来的数据
socket.on('clientE', function(msg){ $('#messages').append($('<li>').text(msg));});
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