Jquery实现无缝向上循环滚动列表的特效

 <div class="slide-title">
 <span>title1</span>
 <span>title2</span>
 <span>title3</span>
 </div>
 <div class="slide-container"><!--css设置时，注意高度是显示多少个item,如：item的高度是30px，显示3个，高度则是 3*30 = 90px -->
 <ul class="slide-list js-slide-list">
 <li class="odd"><span>item1</span><span>item1</span><span>item1</span></li>
 <li class="even"><span>item2</span><span>item2</span><span>item2</span></li>
 <li class="even"><span>item2</span><span>item2</span><span>item2</span></li>
 </ul>
 </div>

var doscroll = function(){
 var $parent = $('.js-slide-list');
 var $first = $parent.find('li:first');
 var height = $first.height();
 $first.animate({
 height: 0 //或者改成： marginTop: -height + 'px'
 }, 500, function() {// 动画结束后，把它插到最后，形成无缝
 $first.css('height', height).appendTo($parent);
 // $first.css('marginTop', 0).appendTo($parent);
 });
};
setInterval(function(){doscroll()}, 2000);