js 操作COOKE备忘

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 ""
}

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());
}