websocket
/
welcome.html

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>after-sales api</title>
</head>
<body>
   Welcome<br/><input id="text" type="text"/>
   <button onclick="send()">发送消息</button>
    <hr/>
    <button onclick="closeWebSocket()">关闭WebSocket连接</button>
    <hr/>
    <div id="message"></div>
</body>
<script type="text/javascript">
     var websocket = null;
     //判断当前浏览器是否支持WebSocket
     if ('WebSocket' in window) {
             websocket = new WebSocket("ws://localhost:8080/websocket");
         }
     else {
             alert('当前浏览器 Not support websocket')
         }

     //连接发生错误的回调方法
     websocket.onerror = function () {
             setMessageInnerHTML("WebSocket连接发生错误");
         };

     //连接成功建立的回调方法
     websocket.onopen = function () {
             setMessageInnerHTML("WebSocket连接成功");
         }

     //接收到消息的回调方法
     websocket.onmessage = function (event) {
             setMessageInnerHTML(event.data);
         }

     //连接关闭的回调方法
     websocket.onclose = function () {
             setMessageInnerHTML("WebSocket连接关闭");
         }

     //监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
     window.onbeforeunload = function () {
             closeWebSocket();
         }

     //将消息显示在网页上
     function setMessageInnerHTML(innerHTML) {
             document.getElementById('message').innerHTML += innerHTML + '<br/>';
         }

     //关闭WebSocket连接
     function closeWebSocket() {
             websocket.close();
         }

     //发送消息
     function send() {
             var message = document.getElementById('text').value;
             websocket.send(message);
         }
    </script>
</html>