https://github.com/sitegui/nodejs-websocket

1.用node搭建本地服务

npm install nodejs-websocket

	var ws = require("nodejs-websocket");
	var server = ws.createServer(function(conn){
	console.log('New Connection!');
	conn.on('text',function(str){
		console.log('receive' + str);
		conn.sendText(str.toUpperCase() + '!!!');
	})
	conn.on('close',function(code,reason){
		console.log('Connection closed');
	})

	//服务出现错误时用来处理错误，如果不加出现错误服务就会挂掉
	// conn.on('error',function(err){
	// 	console.log('handle error');
	// 	console.log(err);
	// })
	}).listen('3000');                                                                                                                                                       
	console.log('node websocket run listening on port 3000')

客户端代码实现

	<!DOCTYPE html>
	<html lang="en">

		<head>
   		 	<meta charset="UTF-8">
    		<title>websocket测试</title>
   		    <style>
   				 input {
       	         outline: none;
                }

    			.content {
        		margin-top: 20px;
        		width: 300px;
      			min-height: 100px;
      		    border: 1px solid blue;
    			}
    	</style>
	</head>

	<body>
    	<h3>websocket演示</h3>
   	    <input type="text" id='txt'>
        <button id='sendTxt'>发送</button>
        <div class='content' id='receiveMsg'></div>
    	<script>
    		var websocket = new WebSocket('ws://localhost:3000/');
   		    websocket.onopen = function() {
            console.log('websocket open');
            document.getElementById('receiveMsg').innerHTML = 'Connected';
            };
            websocket.onclose = function() {
            console.log('websocket close');
            };
            websocket.onmessage = function(e) {
            console.log(e);
            document.getElementById('receiveMsg').innerHTML = e.data;
        
           };
    	   document.getElementById('sendTxt').onclick = function() {
           var txt = document.getElementById('txt').value;
           websocket.send(txt);
         };
    </script>
</body>

</html>

简单的websocket应用，只是将客户端收到的信息发送到服务端，将原字符串转化为大写后加上三个！！！后返回；

改进后的代码如下：

服务端代码：