HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Worker message listener</title>
</head>
<body>
  <pre id="out">Waiting...</pre>
  <script>
    var code = "self.postMessage(\"I'm alive!\");";
    var url = URL.createObjectURL(new Blob([code], { type: "application/javascript" }));
    var worker = new Worker(url);
    worker.addEventListener("message", function (event) {
      document.getElementById("out").textContent =
        "Received message from worker: " + event.data;
      worker.terminate();
      URL.revokeObjectURL(url);
    });
  </script>
</body>
</html>

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Worker message — addEventListener (Try It)