HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>wrapInner callback demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 520px; }
    .section { border: 1px solid #cbd5e1; margin: 8px 0; padding: 8px; border-radius: 8px; }
    .inner-0 { background: #dbeafe; padding: 6px; border-radius: 4px; }
    .inner-1 { background: #dcfce7; padding: 6px; border-radius: 4px; }
    .inner-2 { background: #fef08a; padding: 6px; border-radius: 4px; }
    button { margin-top: 12px; padding: 10px 16px; background: #6366f1; color: #fff; border: none; border-radius: 6px; cursor: pointer; }
    #hint { color: #64748b; font-size: 14px; margin-top: 10px; }
  </style>
</head>
<body>
  <div class="section">Section Alpha</div>
  <div class="section">Section Beta</div>
  <div class="section">Section Gamma</div>
  <button type="button">wrapInner with callback</button>
  <p id="hint">Callback runs once per .section — unique inner class</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("button").on("click", function() {
      $(".section").wrapInner(function(index) {
        return "<div class='inner-" + index + "'></div>";
      });
      $("#hint").text("Each section's contents wrapped in inner-0, inner-1, inner-2.");
    });
  </script>
</body>
</html>

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jQuery .wrapInner(callback) — index class (Try It)