HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>even vs odd</title>

  <style>

    body { font-family: sans-serif; padding: 16px; }

    li { margin: 4px 0; padding: 4px 8px; }

    #output { margin-top: 12px; padding: 12px; background: #e0f2fe; border: 1px solid #0284c7; }

  </style>

</head>

<body>

  <ul id="list">

    <li>Item 0</li>

    <li>Item 1</li>

    <li>Item 2</li>

    <li>Item 3</li>

    <li>Item 4</li>

  </ul>

  <div id="output"></div>

  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>

  <script>

    $("#list li:even").css("backgroundColor", "#bbf");

    $("#list li:odd").css("color", "#dc2626");

    $("#output").html(

      ":even → " + $("#list li:even").length + " items (indices 0, 2, 4)<br>" +

      ":odd → " + $("#list li:odd").length + " items (indices 1, 3)"

    );

  </script>

</body>

</html>

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