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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>$.ajax() global false</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 560px; }
    button { margin-right: 8px; padding: 8px 14px; cursor: pointer; border: none; border-radius: 6px; color: #fff; }
    #global { background: #2563eb; }
    #private { background: #64748b; }
    .log { margin-top: 14px; padding: 12px; background: #f8fafc; border: 1px solid #e2e8f0; border-radius: 6px; font-size: 13px; min-height: 48px; }
  </style>
</head>
<body>
  <button type="button" id="global">Global request</button>
  <button type="button" id="private">global: false</button>
  <div class="log">ajaxStart count: 0</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var count = 0;
    $(document).on("ajaxStart", function() {
      count++;
      $(".log").text("ajaxStart count: " + count);
    });
    $("#global").on("click", function() {
      $.ajax({ url: "https://jsonplaceholder.typicode.com/posts/1" });
    });
    $("#private").on("click", function() {
      $.ajax({ url: "https://jsonplaceholder.typicode.com/posts/2", global: false });
    });
  </script>
</body>
</html>

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jQuery.ajax() — global: false opt-out (Try It)