JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html lang="ja">
  <head>
    <meta charset="UTF-8">
    <title>Sample Code</title>
    <link rel="stylesheet" href="css\styles.css">
  </head>
    <body>
      <ul>
        <li>リストA</li>
        <li>リストB</li>
        <li>リストC</li>
      </ul>
      <p></p>
      <script src="https://code.jquery.com/jquery-3.6.0.js" integrity="sha256-H+K7U5CnXl1h5ywQfKtSj8PCmoN9aaq30gDh27Xc0jk=" crossorigin="anonymous"></script>
      <script src="js\main.js"></script>
    </body>
</html>

JavaScript

$(function() {
  $("li").each(function(index, element) {
    $("p").append(
      index + ":" + $(element).text() + ", "
    );
  });
});