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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery nth-child vs eq demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    ul { list-style: none; padding: 0; max-width: 280px; }
    li { padding: 8px; margin: 4px 0; background: #f1f5f9; border-radius: 6px; }
    li.nth { outline: 2px solid #2563eb; }
    li.eq { outline: 2px solid #ea580c; }
    #log { margin-top: 12px; font-family: monospace; white-space: pre-line; }
  </style>
</head>
<body>
  <ul id="list">
    <li>Alpha</li>
    <li>Beta</li>
    <li>Gamma</li>
  </ul>
  <div id="log"></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#list li:nth-child(1)").addClass("nth");
    $("#list li").eq(1).addClass("eq");

    $("#log").text(
      "nth-child(1) → " + $("#list li:nth-child(1)").text() + " (first child, 1-based)\n" +
      ".eq(1) → " + $("#list li").eq(1).text() + " (second in set, 0-based)"
    );
  </script>
</body>
</html>

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jQuery :nth-child() vs .eq() — index difference (Try It)