Add class Active in navbar menu

active-menu-bar.js

$(function(){

var url = window.location.pathname, 
    urlRegExp = new RegExp(url.replace(/\/$/,'') + "$"); // create regexp to match current url pathname and remove trailing slash if present as it could collide with the link in navigation in case trailing slash wasn't present there
    // now grab every link from the navigation
    $('#box-menu a').each(function(){
        // and test its normalized href against the url pathname regexp
        if(urlRegExp.test(this.href.replace(/\/$/,''))){
            $(this).addClass('active');
        }
    });

});

//CSS
//.active{
// color:red;
//}