<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<button onclick="send()">send</button>
<script>
const ws = new WebSocket('ws://localhost:9900/ws')
ws.onmessage = function (e) {
console.log(e.data)
}
function send() {
console.log('click')
ws.send('send click')
}
</script>
</body>
</html>