代码来源于网络。页面虽简陋，但测试还是没有问题的。
更改23行的地址就行了。打开或刷新就会建立连接。
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>socket</title>
</head>
<body>
<div id="cc" style="width:500px;">
<div id="content" style=" height:400px; overflow:auto; width:100%; border:1px solid #ccc;"></div>
<form id="form">
<textarea id="text" style="width:100%; height:200px;"></textarea>
<input type="button" onclick="ab();" value="发送">
</form>
</div>
<p id="a"></p>
<script src="https://code.jquery.com/jquery-2.1.3.min.js" type="text/javascript"></script>
</body>
</html>
<script>
var wsServer = 'ws://127.0.0.1:9501';
var websocket = new WebSocket(wsServer);
websocket.onopen = function (evt) {
console.log("Connected to WebSocket server.");
};
websocket.onclose = function (evt) {
console.log("Disconnected");
};
websocket.onmessage = function (evt) {
$('#content').append(evt.data+"<br>");
// document.getElementById('div').style.background = evt.data;
console.log('Retrieved data from server: ' + evt.data);
};
websocket.onerror = function (evt, e) {
console.log('Error occured: ' + evt.data);
};
function ab(){
var zhi = $('#text').val();
websocket.send(zhi);
$('#text').val('');
}
</script>