set-get-cookie.js

function setCookie(cname, cvalue, exdays) {
    if (!navigator.cookieEnabled) return;
    var d = new Date();
    d.setTime(d.getTime() + (exdays*24*60*60*1000));
    var expires = "expires=" + d.toUTCString();
    document.cookie = cname + "=" + encodeURIComponent(cvalue) + ";" + expires + ";path=/";
}

function getCookie(cname) {
    if (!navigator.cookieEnabled || !document.cookie) return null;
    var re = new RegExp(cname + "=([^; ]*)(; |$)");
    var found = document.cookie.match(re);
    if (!found) return null;
    var cvalue = decodeURIComponent(found[1]);
    return cvalue;
}

function cookieEnabled() {
    if (navigator.cookieEnabled) return true;
    // in case of an old browser
    try {
        document.cookie = "cookietest=1";
        var cookiesEnabled = document.cookie.indexOf('cookietest=') !== -1;
        // delete cookie
        document.cookie = "cookietest=1; expires=Thu, 01-Jan-1970 00:00:01 GMT";
        console.log("cookiesEnabled", cookiesEnabled);
        return cookiesEnabled;
    } catch (e) {
        return false;
    }
}