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<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>jQuery even selector demo</title>

  <style>

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

    table { background: #eee; border-collapse: collapse; width: 100%; }

    td { padding: 8px 12px; border: 1px solid #ccc; }

  </style>

</head>

<body>

  <table>

    <tr><td>Row with Index #0</td></tr>

    <tr><td>Row with Index #1</td></tr>

    <tr><td>Row with Index #2</td></tr>

    <tr><td>Row with Index #3</td></tr>

  </table>

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

  <script>

    $("tr:even").css("background-color", "#bbf");

  </script>

</body>

</html>

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jQuery tr:even — official demo (Try It)