JQuery add/remove class on click – toggleClass()

				
					<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script type="text/javascript">
    $(document).ready(function () {
        $('#menu li').on('click', function () {
            $(this).toggleClass('open');
    });
});
</script>