jquery 新闻滚动效果

$(function () {
   var scrollTimer = null;
   var delay = 2000;
   //1.鼠标对新闻触发mouseout事件后每2s调用scrollNews()
   //2.鼠标对新闻触发mouseover事件后停止调用scrollNews()
   //3.初次加载页面触发鼠标对新闻的mouseout事件
   $('div.busMsg').hover(function () {
   clearInterval(scrollTimer);
   }, function () {
   scrollTimer = setInterval(function () {
   scrollNews();
   }, delay);
   }).triggerHandler('mouseout');
   });
   //滚动新闻
   function scrollNews() {
   var $news = $('div.busMsg>ul');
   var $lineHeight = $news.find('li:first').height();
   $news.animate({ 'marginTop': -$lineHeight + 'px' }, 600, function () {
   $news.css({ margin: 0 }).find('li:first').appendTo($news);
   });
   }