li 요소 active class 추가

1. addClass

$(document).ready(function(){
    $(function(){
        const selector = '.nav li';
        const current = location.pathname;
        $(selector ).each(function(){
            const $this = $(this);
            const className = $this.attr('class'); 
            if ( className === current ) {
                $this.addClass('active');
            }
        })
    });
});