HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>button — switch</title>
</head>
<body>
  <button id="button" type="button">Click here with your mouse…</button>
  <p id="log"></p>
  <script>
    var button = document.querySelector("#button");
    var log = document.querySelector("#log");
    button.addEventListener("mouseup", function (e) {
      switch (e.button) {
        case 0:
          log.textContent = "Left button clicked.";
          break;
        case 1:
          log.textContent = "Middle button clicked.";
          break;
        case 2:
          log.textContent = "Right button clicked.";
          break;
        default:
          log.textContent = "Unknown button code: " + e.button;
      }
    });
    button.addEventListener("contextmenu", function (e) {
      e.preventDefault();
    });
  </script>
</body>
</html>

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MouseEvent.button — mouseup switch (Try It)