HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>jQuery .addClass multiple classes</title>

  <style>

    p { margin: 8px; font-size: 16px; }

    .selected { color: red; }

    .highlight { background: yellow; }

  </style>

</head>

<body>

  <p>Hello</p>

  <p>and</p>

  <p>Goodbye</p>

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

  <script>

    $("p").last().addClass("selected highlight");

  </script>

</body>

</html>

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jQuery .addClass('selected highlight') — multiple (Try It)