JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
       
        <li>3
            <ul>
                <li>aaa</li>
                <li>aaa</li>
                <li>aaa</li>
            </ul>
        </li>
         <li>2</li>
    </ul>

JavaScript

$(document).ready(function() {
    $("ul li:not(:has(li.current))").find("ul").hide().end()     .click(function() {
        if (event.target==this) {
        $(this).children('ul').slideToggle();
            return false;
        }
    });
});