Евгений

socket.on('trade_created', function(data){
    var trade = JSON.parse(data);
    var tradenumber = trade.tradeid;

    if (tradenumber) {
        $('#timevalue').addClass('invisible');
        $(".tradeOfferResponse").show().find('a').prop("href", "https://steamcommunity.com/tradeoffer/"+ tradenumber +"/");
    }
});

$(document).on('click', '.second_class', function () {
    //...
});

var triggers = document.querySelectorAll('.trigger');
var items = document.querySelectorAll('.list_inner');

[].forEach.call(triggers, function (trigger, index) {
    trigger.addEventListener('click', function () {
        items[index].classList.toggle('visible');
    });
});

function replaceReverse(string, reg, rep) {
    string = string.split('').reverse().join('');
    return string.replace(reg, rep);
}

function isEven(n) {
    if (n % 2 == 0)
        return true;

    return false;
}

function isAjax() {
    return isset($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest';
}

window.navigator.platform // => ОС
window.navigator.appVersion // => Браузер + версия
window.navigator.geolocation // => Геолокация
window.navigator.language // => Язык
window.screen.availWidth // => Ширина
window.screen.availHeight // => Высота

var cookieCounter = Cookies.get('disable_banner');

if (cookieCounter && cookieCounter < 3) {
    /* Показываем блок */
    cookieCounter++;
    Cookies.set('disable_banner', cookieCounter, { expires: 365 });
} else {
    Cookies.set('disable_banner', 0, { expires: 365 });
}