js写入和读取Cookie

//写入Cookiedocument.cookie = "cookieName=" + escape("要写入的内容");//cookieName为要写入的Cookie的名称//读Cookie，返回值为相应Cookie的内容function getCookie(cookieName){    var cookieContent = '';    var cookieAry = document.cookie.split("; ");//得到Cookie数组    for(var i=0;i<cookieAry.length;i++){        var temp = cookieAry[i].split("=");        if(temp[0] == cookieName){             cookieContent = unescape(temp[1]);        }    }    return cookieContent;}