cookie操作

JS操作cookie
//设置cookie值
function setCookie()
{
    createCookie("cookieName","cookieValue",365);
}

//写Cookie值
function createCookie(name,value,days)
{
    if (days){
        var date = new Date();
        date.setTime(date.getTime()+(days*24*60*60*1000));
        var expires = "; expires="+date.toGMTString();
    }
    else var expires = "";
    document.cookie = name+"="+value+expires+"; path=/";
}

//读Cookie值
function readCookie(name)
{
    var nameEQ = name + "=";
    var ca = document.cookie.split(';');
    for(var i=0;i < ca.length;i++){
        var c = ca[i];
        while (c.charAt(0)==' ') c = c.substring(1,c.length);
        if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
    }
    return null;
}
//清除Cookie
function eraseCookie(name)
{
    createCookie(name,"",-1);
}