client.htm

WebSocket

client.js
var ws = new WebSocket("ws://127.0.0.1:8080/");

ws.onopen = function() {
alert("Opened");
ws.send("I'm client");
};

ws.onmessage = function (evt) {
alert(evt.data);
};

ws.onclose = function() {
alert("Closed");
};

ws.onerror = function(err) {
alert("Error: " + err);
};
服务端可以用各种语言去实现，Java可以用Jetty，C#可以用SuperSocket，这里我举例用Node.js，创建server.js：

var WebSocketServer = require('ws').Server
, wss = new WebSocketServer({port: 8080});
wss.on('connection', function(ws) {
ws.on('message', function(message) {
console.log('received: %s', message);
});
ws.send('something');
});
运行方式：

npm install ws
node server.js