HTML 代码：
<body>
<h1>WebScoket示例</h1>
<br /><br />
<input type="text" id="message" name="message" value="WebSocket 示例" />
<input type="button" value="发送" onclick="openSession();" />
<input type="button" id="closeSession_button" value="关闭会话" disabled="disabled" onclick="closeSession();" />
<hr />
<div id="message_div"></div>
</body>
JavaScript 代码：
var webSocket = null; // WebSocket 对象
/**
* 创建 WebSocket 对象，并建立与服务器端的连接，即打开 WebSocket 会话
*/
var openSession = function(){
if(null == webSocket) {
webSocket = new WebSocket('ws://localhost/testProject/websocketDemo');
webSocket.onopen = function(event) {
console.log('建立与服务端的连接，即打开会话。');
window.document.getElementById('closeSession_button').disabled = '';
var message = window.document.getElementById('message').value;
webSocket.send(message);
}
/**
* 与服务端的连接出现错误
*/
webSocket.onerror = function(event) {
console.log('连接出错啦！' + event.reason);
}
} else {
var message = window.document.getElementById('message').value;
webSocket.send(message);
}
/**
* 监听消息
*/
webSocket.onmessage = function(event){
console.log('接收服务端推送的消息，消息内容为：' + event.data);
window.document.getElementById('message_div').innerHTML += event.data + '<br />';
}
}
/**
* 断开与服务端的连接，即关闭 WebSocket 会话
*/
var closeSession = function() {
webSocket.close(); // 关闭 webSocket 连接
window.document.getElementById('closeSession_button').disabled = 'disabled';
window.document.getElementById('message_div').innerHTML = '';
webSocket.onclose = function(event) {
console.log('与服务端的连接已断开！' + event.reason);
}
webSocket = null;
}