cookie 用户第一次访问时执行

<script type="text/javascript" src="/js/jquery.Cookies.js"></script>

<div id="zhezhaoyd"></div>
    <div class="clearfix"></div>
    <div class="yaoqing-yindao">
        <div class="w1002 pr">
            <div class="yaoqing-yindaobj"><a href="/user/InvitationCode"></a></div>
           <div class="w"></div>
            <div class="closeyaoqbtn"></div>
        </div>
    </div>
    <script>
        $(function () {

            //申请

            $("#zhezhaoyd").height($(window).height()).width($(window).width());
            $("#zhezhaoyd").css("background","url(/images/zhezhoabj_03.png) repeat left top")
            function yingdao(){
                $("#zhezhaoyd").fadeIn(100);
                $(".yaoqing-yindao").fadeIn(100);
            }

            $("#zhezhaoyd,.closeyaoqbtn").click(function() {

                $("#zhezhaoyd").fadeOut(100);
                $(".yaoqing-yindao").fadeOut(200);

            });
            if ($.cookie("yingdao") == null) {
                yingdao();
                $.cookie("yingdao", '', 'true', { expires: 3650 });
            }

        })

</script>