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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Worker message data</title>
</head>
<body>
  <pre id="out">Waiting...</pre>
  <script>
    var code = "self.postMessage({ type: 'result', value: 42 });";
    var url = URL.createObjectURL(new Blob([code], { type: "application/javascript" }));
    var worker = new Worker(url);
    worker.onmessage = function (event) {
      var type = event.data.type;
      var value = event.data.value;
      document.getElementById("out").textContent = type + " " + value;
      worker.terminate();
      URL.revokeObjectURL(url);
    };
  </script>
</body>
</html>

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Worker message — event.data object (Try It)