标签：console const question host new closed library div 安装
不错的介绍：https://www.zhihu.com/question/20215561
websocket是一种持久化的协议，实现了浏览器和服务端的全双工通信；
握手阶段与HTTP协议相同，返回状态码101（switching protocols）；
握手阶段完成之后，按照websocket协议进行通信
应用场景：
浏览器与服务端需要实时通信的场景，以前的解决方式：ajax轮询、HTTP长连接、Flash等。
实现：
浏览器端
const ws = new WebSocket(‘ws://localhost:8080‘); ws.onopen = function (evt) { console.log(‘connection open...‘); ws.send(‘hello websocket‘); } ws.onmessage = function (evt) { console.log(‘frontend received: ‘ + evt.data); } ws.onclose = function (evt) { console.log(‘connection closed...‘); }
node端
首先需要安装library：
以ws为例：
const WebSocket = require(‘ws‘); const ws = new WebSocket.Server({port: 8080}); ws.on(‘connection‘, function (ws) { ws.on(‘message‘, function (msg) { console.log(‘backend received: ‘+ msg); }) ws.send(‘something‘); })
标签：console const question host new closed library div 安装
原文地址：http://www.cnblogs.com/zmiaozzz/p/7143602.html
