Untitled

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width" />
    <title>Hello world from a worker</title>
  </head>
  <body>
    <script charset="utf-8">
      var worker = new Worker('worker.js');

      worker.addEventListener('message', function(e) {
        console.log('Worker said:', e.data);
      }, false);

      worker.postMessage('Hello worker');
    </script>
  </body>
</html>