setCookie = function (cname, cvalue, exdays) {
    let expires = "";
    if (typeof exdays !== 'undefined' && exdays !== null) {
        let d = new Date();
        d.setTime(d.getTime() + (exdays * 24 * 60 * 60 * 1000));
        expires = "expires=" + d.toUTCString();
    }
        document.cookie = cname + "=" + cvalue + ";secure;" + expires + ";path=/";
    };

getCookie = function (cname) {
    let name = cname + "=";
    let decodedCookie = decodeURIComponent(document.cookie);
    let ca = decodedCookie.split(';');
    for (let i = 0; i < ca.length; i++) {
        let c = ca[i];
        while (c.charAt(0) === ' ') {
            c = c.substring(1);
        }
        if (c.indexOf(name) === 0) {
            return c.substring(name.length, c.length);
        }
    }
    return null;
};

deleteCookie = function (cname) {
    document.cookie = cname + "=; expires=Thu, 01 Jan 1970 00:00:00 UTC; path=/;";
};