JSFiddle - React, Tailwind, and code Playground

HTML

<div class="Downloadscontainer">
    <ul>
        <li>level 1</li>
        <li><a href="#">some page</a>
            <ul>
                <li>level 2</li>
                 <li>level 2</li>
                 <li><a href="#">some page</a>
                <ul>
                    <li>level 2</li>
                    <li>level 2</li>
                     </ul>
                </li>
            </ul>
        </li>
    </ul>
</div>

JavaScript

$(".Downloadscontainer ul li ul").css("display", "none");
        $(".Downloadscontainer li").each(function () {
            $(this).click(function () {
                if ($(this).children('ul').length > 0) {
                    $(this).children('ul').toggle();
                }
            });
        });