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一个最简单的WebSocket hello world demo

日期：2019-03-09点击：306收藏

服务器端代码不超过42行：

const WSServer = require("./server.js"); var counter = 0; function createWebsocket() { var host = "127.0.0.1"; var port = "9999"; var wsServer = WSServer.startServer(host, port); console.log("WebSocket server listens to: " + host + ":" + port); wsServer.on('open', (data) => { console.log('WS Client has connected: ' + data); setInterval(function(){ counter++; WSServer.broadcast("Jerry: " + counter ); }, 3000); }); wsServer.on('dataWS', (data) => { console.log('Receive Data from WebUI : ' + data); }); wsServer.on('disconnect', (data) => { console.log('WSServer disconnect:' + data.name); }); wsServer.on('close', (data) => { console.log('WSServer close: ' + data.name); }); wsServer.on('end', (data) => { console.log('WSServer Close: '+data.name); }); wsServer.on('error', (data) => { }); } createWebsocket(); </pre>

代码第10行创建一个WebSocket服务器，监听在9999端口上：

第15～18行每隔3秒发送一个字符串到浏览器，用一个计数器标识每次发送的请求。

代码里所需的server.js我已经上传到我的Github上了：

https://github.com/i042416/KnowlegeRepository/blob/master/practice/nodejs/server.js

使用nodejs启动这个服务器：

网页端代码：

<html> <script src="socket.io.dev.js"> </script> <script> console.log("1"); var socket = io('ws://127.0.0.1:9999'); socket.on('connect', function(){ console.log("connected!"); }); socket.on('event', function(data){ console.log("event: " + data); }); socket.on('news', function(data){ console.log("data from server: " + JSON.stringify(data,2,2)); }); socket.on('disconnect', function(){ console.log("disconnect..."); }); </script> </html> </pre>

浏览器端每隔三秒收到服务器推送的消息，打印在console上：