JS读取Cookie

//获得Cookie
function getCookie(name)
{
    var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)");
    if(arr=document.cookie.match(reg))
        return unescape(arr[2]);
    else
        return null;
}
//设置Cookie和时间
function setCookie(name,value,day)
{
    var Days = 365;
    if (day!=null)
    {
        Days=day;
    }
    var exp = new Date();
    exp.setTime(exp.getTime() + Days*24*60*60*1000);
    document.cookie = name + "="+ value + ";expires=" + exp.toGMTString();
}