登录之后只提示一次的提示框

<script>
    $(document).ready(function () {
        //判断cookie中是否展示过的状态  1为展示过          animate为JQ中的动画
        if (!getCookie("noticebombox")) {
            $(".noticebom-box").animate({ height: "200px" }, 2000);
            $(".noticebom-i").click(function () {
                $(".noticebom-box").animate({ height: "0px" }, 1000);
            })
            document.cookie = "noticebombox=1";
        }
    })
　　　//读取cookie，解析得到值
    function getCookie(cname) {
        var name = cname + "=";
        var ca = document.cookie.split(';');
        for (var i = 0; i < ca.length; i++) {
            var c = ca[i].trim();
            if (c.indexOf(name) == 0) return c.substring(name.length, c.length);
        }
        return "";
    }
</script>