cookie set favorite item by id

cookie-set-favorite-id.js

$(function() {
    $('.fav-item').on('click',function(){
         if (!$(this).hasClass('fav-item-over')) {
             write_fav($(this).attr('data-id'));
        }else{
            erase_fav($(this).attr('data-id'));
        }
    });
    load_fav();
});
function favThumb(e) {
    status = $(this).parent().children('.fav-item').attr('class');
    var $el = $(this).parent().children('.fav-item');
    if (status == 'fav-item') {
         write_fav($el.attr('data-id'));
        $(this).parent().children('.fav-item').addClass('fav-item-over');
    } else if (status == 'fav-item fav-item-over') {
        erase_fav($el.attr('data-id'));
        $(this).parent().children('.fav-item').removeClass('fav-item-over');
    }
}
function createCookie(name, value, days) {
    if (days) {
        var date = new Date();
        date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
        var expires = "; expires=" + date.toGMTString();
    }
    document.cookie = name + "=" + value + expires + "; path=/";
}
function readCookie(name) {
    var nameEQ = name + "=";
    var ca = document.cookie.split(';');
    for (var i = 0; i < ca.length; i++) {
        var c = ca[i];
        while (c.charAt(0) == ' ') c = c.substring(1, c.length);
        if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length, c.length);
    }
    return null;
}
function eraseCookie(name) {
    createCookie(name, "", -1);
}
function write_fav(id){
    var cookie;
    if(id){
        cookie = readCookie('fav-item');
        if(cookie){
            cookie = cookie.split(',');
            if(cookie.indexOf(id) < 0 ){
                cookie.push(id);
                createCookie('fav-item',cookie.join(),14);
            }else{
                //cookie.push(id);
                createCookie('fav-item',cookie.join(),14);
            }
        }else{
            var cookie = [];
            cookie.push(id);
            createCookie('fav-item',cookie.join(),14);
        }
    }
    $('.fav-itens').find('span').text(cookie.length);
}
function erase_fav(id){
    if(id){
        var cookie;
        cookie = readCookie('fav-item');
        cookie = cookie.split(',');
        while(cookie.indexOf(id) >=0 ){
            var index = cookie.indexOf(id);
            if(index >= 0){
                cookie.splice(index, 1);
            }
        }
        createCookie('fav-item',cookie.join(),14);
    }
    $('.fav-itens').find('span').text(cookie.length);
}
function load_fav(){
    var cookie = readCookie('fav-item');
    if(cookie){
        cookie = cookie.split(',');
        $('.fav-itens').find('span').text(cookie.length);
        $.each($(".fav-item"), function(index, val) {
             if(cookie.indexOf($(this).attr('data-id')) >= 0){
                $(this).addClass('fav-item-over')
             }
        });
    }
}