js----------js的cookie的删除，存储，获取

            function SetCookie(name,value)//两个参数，一个是cookie的名子，一个是值
            {
                var Days = 30; //此 cookie 将被保存 30 天
                var exp  = new Date();    //new Date("December 31, 9998");
                exp.setTime(exp.getTime() + Days*24*60*60*1000);
                document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();
            }


            function delCookie(name)//删除cookie
            {
                var exp = new Date();
                exp.setTime(exp.getTime() - 1);
                var cval=getCookie(name);
                if(cval!=null) document.cookie= name + "="+cval+";expires="+exp.toGMTString();
            }


            function getCookie(name)//读取cookies函数        
            {
                var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));
                if(arr != null) return unescape(arr[2]); return null;
            }