js cookie存取

　　　　　　　if(getCookie('guide') == 'true'){
                window.location.href=''
            } else {
                setCookie('guide','true');
            }
            function getCookie(name)
            {
                var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)");
                if(arr=document.cookie.match(reg))
                    return unescape(arr[2]);
                else
                    return null;
            }
            //写cookies
            function setCookie(name,value) {
                var Days = 30;
                var exp = new Date();
                exp.setTime(exp.getTime() + Days*24*60*60*1000);
                document.cookie = name + "="+ escape (value) + "; expires=" + exp.toGMTString() + "; path=/";
            }