site.js

// Write your Javascript code.
$(function() {
    $(".navbar-nav a").on("click", function(){
        $(".navbar-nav").find(".active").removeClass("active");
        $(this).parent().addClass("active");

        if (location.pathname.replace(/^\//, '') == this.pathname.replace(/^\//, '') || location.hostname == this.hostname) {

            var target = $(this.hash);
            target = target.length ? target : $('[name=' + this.hash.slice(1) + ']');

            if (target.length) {
                $('html,body').animate({
                    scrollTop: target.offset().top
                }, 900);
                return false;
            }
        }
    });
});