<script type="application/javascript">
        function getCookieByName(cookieName) {
            var cookieObj = {};
            var cookieSplit=[];
                // 以分號（;）分組
            var cookieArr=document.cookie.split(";");

            for(var i=0,len=cookieArr.length;i<len;i++)
                if(cookieArr[i]) {
                    // 以等號（=）分組
                    cookieSplit=cookieArr[i].split("=");
                    // Trim() 是自定義的函式，用來刪除字串兩邊的空格
                    cookieObj[cookieSplit[0].trim()]=cookieSplit[1].trim();
                }
            return cookieObj[cookieName];
        }


        function setCookie(key,value) {
            var date = new Date(),
                t = 5;
            date.setDate( date.getDate() + t );
            document.cookie = key+'='+encodeURIComponent(value)+';expires='+date.toGMTString();
        }

        function getCookieByKey(key) {
            var arr,reg = RegExp('(^| )'+key+'=([^;]+)(;|$)');
            if (arr = document.cookie.match(reg))    //["username=liuwei;", "", "liuwei", ";"]
                return decodeURIComponent(arr[2]);
            else
                return null;
        }

        function delCookie(key) {
            var date = new Date();
            date.setTime(date.getTime() - 1);
            var delValue = getCookie(key);
            if (!!delValue) {
                document.cookie = key+'='+delValue+';expires='+date.toGMTString();
            }
        }

        </script>