HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>.ajaxSuccess() off handler</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 520px; }
    button { margin-right: 8px; padding: 8px 12px; cursor: pointer; border-radius: 6px; border: none; }
    #fetch { background: #2563eb; color: #fff; }
    #remove { background: #64748b; color: #fff; }
    .log { margin-top: 14px; padding: 12px; background: #eff6ff; border-radius: 6px; font-size: 14px; }
  </style>
</head>
<body>
  <button type="button" id="fetch">Trigger $.get()</button>
  <button type="button" id="remove">Remove handler</button>
  <div class="log">Handler active — ajaxSuccess count: 0</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var count = 0;

    function onSuccess() {
      count++;
      $(".log").text("Handler active — ajaxSuccess count: " + count);
    }

    $(document).ajaxSuccess(onSuccess);

    $("#fetch").on("click", function() {
      $.get("https://jsonplaceholder.typicode.com/posts/1");
    });

    $("#remove").on("click", function() {
      $(document).off("ajaxSuccess", onSuccess);
      $(".log").text("Handler removed — count stays " + count + ".");
    });
  </script>
</body>
</html>

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jQuery .ajaxSuccess() — remove handler with .off() (Try It)