WebSocket 是一种网络通信协议。RFC6455 定义了它的通信标准。WebSocket 是 HTML5 开始提供的一种在单个 TCP 连接上进行全双工通讯的协议。
创建简易的聊天室
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
引入socket.io.js
<script src="socket.io.js"></script> <style> body { font-size: 14px; } #content{ width:300px; height:200px; border:1px solid red; overflow: auto; } .left{ text-align: left; } .right{ text-align: right; } #content p{ border:1px solid green; border-radius:10%; } </style></head><body> <!-- 用户登录 --> <p> <input type="text" id="userName"> <button id="login">登录</button> </p> <!-- 聊天窗口 --> <div id="content"> </div> <!-- 发送按钮 --> <p> <input type="text" id="ipt"> <button id="send">发送 to who</button> </p> <button id="clos">断开连接</button> <!-- 上线用户列表 --> <ul id="list"></ul></body><script> var socket; var user = ‘‘; var toWho = ‘‘; login.onclick = function () { socket = io(‘http://localhost:3000‘); socket.emit(‘login‘, {userName: userName.value}); user = userName.value; socket.on(‘userList‘, function (data) { console.log(data); var html = ‘‘; for (x in data) { html += ‘<li>‘ + data[x] + ‘</li>‘; } list.innerHTML = html; }); socket.on("send", function (data) { content.innerHTML += "<p class=‘left‘>" + data.from + " : " + data.msg + "</p>" }); } send.onclick = function () { socket.emit(‘send‘, { to: toWho, from: user, msg: ipt.value }); content.innerHTML += "<p class=‘right‘>我:" + ipt.value + "</p>"; } list.onclick = function (e) { if (e.target.nodeName == "LI") { toWho = e.target.innerHTML; } send.innerHTML = "发送 to " + toWho; } </script></html>
var http = require("http");var fs = require("fs");var io = require("socket.io");var app = http.createServer(function (req, res) { if (req.url == ‘/‘) { fs.readFile(‘index.html‘, function (err, data) { res.end(data); }); } else if (req.url == ‘/socket.io.js‘) { fs.readFile("socket.io.js", function (err, data) { res.writeHead(200, { "Content-type": "text/javascript" }) res.end(data); }); } else { res.end(‘‘); }}).listen(3000);console.log(‘server is success‘);var ws = io(app);var userObj = {};ws.on(‘connection‘, function (socket) { socket.on(‘login‘, function (data) { userObj[data.userName] = socket; var arr = []; for (var i in userObj) { arr.push(i); } ws.emit("userList", arr); }); socket.on(‘send‘, function (data) { userObj[data.to].emit(‘send‘, data); });});// 全体广播，发送userList事件// ws.emit("userList",arr)// 全体广播除了自己// socket.broadcast.emit("userList",arr);// 只发给自己// socket.emit("userList",arr)
