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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery .hasClass conditional</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    .card {
      padding: 16px;
      border: 1px solid #ccc;
      border-radius: 6px;
      max-width: 280px;
      cursor: pointer;
      margin-bottom: 8px;
    }
    .highlight { background: #fef08a; border-color: #ca8a04; }
    .hint { color: #64748b; font-size: 14px; }
  </style>
</head>
<body>
  <p class="hint">Click a card to toggle highlight.</p>
  <div class="card">Card A</div>
  <div class="card">Card B</div>
  <div class="card">Card C</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $(".card").on("click", function() {
      var $el = $(this);
      if ($el.hasClass("highlight")) {
        $el.removeClass("highlight");
      } else {
        $el.addClass("highlight");
      }
    });
  </script>
</body>
</html>

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jQuery .hasClass() — conditional toggle (Try It)