这一段有什么问题？怎么改

Question

 <script type="text/javascript">
        var timer
        $(document).ready(function () {
            timer = setInterval(AutoScroll, 500);

            $(".e_list_news").mouseover(
                function () {
                    clearInterval(timer);
                })
            .mouseout(function () {
                timer = setInterval(AutoScroll, 500);
            });

            function AutoScroll() {
                $("#dem").find("ul:first").animate({
                    marginTop: "0px"
                }, 500, function () {
                    $(this).css({ marginTop: "0px" }).find("li:first").appendTo(this);
                });
            }
        });
    </script>

Answer 1

var timer;