var WebSocketServer = require('ws').Server,wss = new WebSocketServer({ port: 8080 });wss.on('connection', function (ws) {console.log('client connected');ws.on('message', function (message) {  console.log(message);});});

<script>var ws = new WebSocket("ws://localhost:8080");ws.onopen = function (e) {  console.log('Connection to server opened');  sendMessage();}function sendMessage() {  ws.send('hello');}</script>