如何实现wss域名

const fs = require('fs');
const https = require('https');
const WebSocket = require('ws');

const server = https.createServer({
  cert: fs.readFileSync('/path/to/cert.pem'),
  key: fs.readFileSync('/path/to/key.pem')
});

const wss = new WebSocket.Server({ server });

wss.on('connection', function connection(ws) {
  ws.on('message', function incoming(message) {
    console.log('received: %s', message);
  });

  ws.send('Hello! Message From Server!!');
});

server.listen(8443, function listening() {
  console.log('Listening on %d', server.address().port);
});

const socket = new WebSocket('wss://yourdomain.com:8443');

socket.onopen = function() {
  console.log('Connected');
  socket.send('Hello Server!');
};

socket.onmessage = function(event) {
  console.log('Message from server ', event.data);
};

socket.onerror = function(error) {
  console.log('WebSocket Error: ' + error);
};