//操作Cookie的方法

//获得cookie值
function getCookieValue(cookieName){
    var cookieString = new String(document.cookie)
    var cookieHeader = cookieName + "="
    var beginPosition = cookieString.indexOf(cookieHeader)
    if (beginPosition != -1) {
        cookieString = cookieString.substring(beginPosition + cookieHeader.length);
        if (cookieString.indexOf(";") > -1) {
            cookieString = cookieString.substring(0, cookieString.indexOf(";"));
        }
        return decodeURIComponent(cookieString);
    }
    return "";
}

//保存cookie
function setCookie(cookieName, cookieValue, hour) {
    var today = new Date();
    var expire = new Date();
    if (hour==null || hour==0)
        hour=1;
    expire.setTime(today.getTime() + 3600000 * hour);
    document.cookie = cookieName+"=" + escape(cookieValue) + ";path=/;domain=.ifeng.com;expires=" + expire.toGMTString();
}

//删除cookie
function delCookie(cookieName) {
    if (getCookieValue(cookieName) != "")
        document.cookie = cookieName+"=;domain=.ifeng.com;expires=0";
}