cookie的函数封装

　　　　// 获取cookie

        function setCookie(name,value,expires,path,domain,secure){

　　　　　　var cookieName=encodeURIComponent(name)+'='+encodeURIComponent(value);

            if(expires){

                cookieName+=';expires='+expires;

            }

            if(path){

                cookieName+=';path='+path;

            }

            if(domain){

                cookieName+=';domain='+domain;

            }

            if(secure){

                cookieName+=';secure='+secure;

            }

            document.cookie=cookieName;

            return document.cookie

        }

        // 获取cookie键值对的value

        function getCookie(name){

            var cookieName=encodeURIComponent(name)+'=';

            var cookieStart=document.cookie.indexOf(name)

            if(cookieStart>-1){

                var cookieEnd=document.cookie.indexOf(';',cookieStart);

                if(cookieEnd==-1){

                    cookieEnd=document.cookie.length;

                }

                var cookieValue=decodeURIComponent(document.cookie.substring(cookieStart+cookieName.length,cookieEnd));

            }

            alert(cookieValue)

            return cookieValue;

        }

        getCookie('email')

      

        // 过期时间

        function setCookieDate(day){

            var date=null;

            if(typeof day=='number' && day>0){

                date=new Date();

                date.setDate(date.getDate()+day);

            }else {

                throw new Error('你输入的天数不合法!必须大于0')

            }

            return date;

        }

　　　　// alert(setCookie('user','linihao',setCookieDate(7)));//给cookie传值

        // alert(setCookie('email','1367899.com',setCookieDate(7)));//给cookie传值