jQuery实现列表自动滚动循环滚动展示新闻

需要在页面中一个小的区域循环滚动展示新闻（公告、活动、图片等等），并且，鼠标悬停时停止滚动并提示，离开后，继续滚动。

效果图：

上干货

html：

<div id="news">

<ul>

<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" title="aaaaaaaaaaaaaaa">aaaaaaaaaaaaaaa</a></li>

<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" title="bbbbbbbbbbbbbbb">bbbbbbbbbbbbbbb</a></li>

<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" title="ccccccccccccccc">ccccccccccccccc</a></li>

<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" title="ddddddddddddddd">ddddddddddddddd</a></li>

<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" title="eeeeeeeeeeeeeee">eeeeeeeeeeeeeee</a></li>

<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" title="fffffffffffffff">fffffffffffffff</a></li>

<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" title="ggggggggggggggg">ggggggggggggggg</a></li>

</ul>

</div>

css：

ui,li {

list-style: none;

}

#news{

height: 75px;

overflow: hidden;

}

关键是js文件：

$(function() {

var $this = $("#news");

var scrollTimer;

$this.hover(function() {

clearInterval(scrollTimer);

}, function() {

scrollTimer = setInterval(function() {

scrollNews($this);

}, 2000);

}).trigger("mouseleave");

function scrollNews(obj) {

var $self = obj.find("ul");

var lineHeight = $self.find("li:first").height(); 

$self.animate({

"marginTop": -lineHeight + "px"

}, 600, function() {

$self.css({

marginTop: 0

}).find("li:first").appendTo($self);

})

}

})

主要就是对hover、setInterval、clearInterval、animate这些方法以及marginTop属性（marginLeft、top、left等等）的理解和运用，需要注意的是，如果不加.trigger("mouseleave")，在网页初始化的时候列表不会滚动，还有appendTo能直接移动元素，就这些了。