HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>terminate cancel</title>
</head>
<body>
  <button id="start" type="button">Start</button>
  <button id="cancel" type="button">Cancel</button>
  <pre id="out">Waiting...</pre>
  <script>
    var code = [
      "var n = 0;",
      "function tick() {",
      "  n += 1;",
      "  self.postMessage(n);",
      "  setTimeout(tick, 200);",
      "}",
      "self.onmessage = function () { tick(); };"
    ].join("\n");
    var url = URL.createObjectURL(new Blob([code], { type: "application/javascript" }));
    var worker = new Worker(url);
    var out = document.getElementById("out");

    worker.onmessage = function (e) {
      out.textContent = "count = " + e.data;
    };

    document.getElementById("start").addEventListener("click", function () {
      worker.postMessage("go");
    });

    document.getElementById("cancel").addEventListener("click", function () {
      worker.terminate();
      URL.revokeObjectURL(url);
      out.textContent = "Canceled";
    });
  </script>
</body>
</html>

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Worker.terminate() — cancel work (Try It)