js Cookie操作

//獲取Cookie
function getCookie(c_name) {
    if (document.cookie.length > 0) {
        c_start = document.cookie.indexOf(c_name + "=")
        if (c_start != -1) {
            c_start = c_start + c_name.length + 1
            c_end = document.cookie.indexOf(";", c_start)
            if (c_end == -1) c_end = document.cookie.length
            return unescape(document.cookie.substring(c_start, c_end))
        }
    }
    return ""
}
//設置Cookie
function setCookie(c_name, value, expiredays) {
    var exdate = new Date()
    exdate.setDate(exdate.getDate() + expiredays)
    document.cookie = c_name + "=" + escape(value) +
    ((expiredays == null) ? "" : ";expires=" + exdate.toGMTString())
}
//檢查Cookie
function checkCookie(videoid) {
    var username = getCookie('videoId' + videoid)
    if (username != null && username != "") {
        return true;
    }
    else {
        setCookie('videoId' + videoid, videoid, 365);
        return false;
    }
}