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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>event.data loop demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 36rem; }
    button { margin: 4px 6px 4px 0; padding: 8px 14px; cursor: pointer; }
    #log { margin-top: 12px; padding: 12px; background: #f8fafc; border: 1px solid #cbd5e1; border-radius: 6px; min-height: 48px; font-size: 13px; line-height: 1.6; }
  </style>
</head>
<body>
  <p>Click each button. Compare <code>event.data.value</code> with bare <code>i</code>.</p>
  <div id="buttons"></div>
  <div id="log"></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var logDiv = $("#log");
    for (var i = 0; i < 5; i++) {
      $("<button type='button'>Button " + i + "</button>").appendTo("#buttons")
        .on("click", { value: i }, function (event) {
          var msgs = [
            "button = " + $(this).index(),
            "event.data.value = " + event.data.value,
            "i = " + i
          ];
          logDiv.append($("<div>").text(msgs.join(", ")));
        });
    }
  </script>
</body>
</html>

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jQuery event.data — official loop demo (Try It)