本文实例讲述了jQuery实现新闻播报滚动及淡入淡出效果。分享给大家供大家参考，具体如下：
下面是上下滚动源码
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>www.jb51.net 向上滚动代码带上下翻按钮滚动特效</title>
<style type="text/css">
body{ color:#333; font-size:13px;}
h3,ul,li{margin:0;padding:0; list-style:none;}
.scrollbox{ width: 340px; margin: 0 auto; overflow: hidden; border: 1px solid #CFCFCF; padding: 10px; }
#scrollDiv{width:340px;height:359px; overflow:hidden;}/*这里的高度和超出隐藏是必须的*/
#scrollDiv li{max-height:90px; width:300px; padding:0 20px;background:url(ico-4.gif) no-repeat 10px 23px; overflow:hidden; vertical-align:bottom; zoom:1; border-bottom:#B7B7B7 dashed 1px;}
#scrollDiv li h3{ height:24px; padding-top:13px; font-size:14px; color:#353535; line-height:24px; width:300px;}
#scrollDiv li h3 a{color:#353535; text-decoration:none}#scrollDiv li h3 a:hover{ color:#F00}
#scrollDiv li div{ height:36px; width:300px; color:#416A7F; line-height:18px; overflow:hidden}
#scrollDiv li div a{ color:#416A7F; text-decoration:none}
.scroltit{ height:26px; line-height:26px; padding-bottom:4px; margin-bottom:4px;}
.scroltit h3{ width:100px; float:left;}
.scroltit .updown{float:right; width:32px; height:22px; margin-left:4px}
#but_up{ background:url(up.gif) no-repeat 0 0; text-indent:-9999px}
#but_down{ background:url(down.gif) no-repeat 0 0; text-indent:-9999px}
#n{margin:10px auto; width:920px; border:1px solid #CCC;font-size:12px; line-height:30px;}
#n a{ padding:0 4px; color:#333}
.test{
margin-top: 50px;
background: #CCCCCC;
border: .5px solid #ddd;
overflow: hidden;
height: 44px;
width: 100px;
}
.test li{
height: 44px;
width: 100%;
float: left;
line-height: 44px;
font-size: 18px;
border-top: .5px solid #ddd;
}
</style>
<script src="jquery-1.4.4.min.js" type="text/javascript"></script>
<script src="jq_scroll.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function(){
$("#scrollDiv").Scroll({line:1,speed:500,timer:2000,up:"but_up",down:"but_down"});
(function(){
var lineH = $(".test").find("li:first").height();
var appendTo = function(){
$(".test").find("li:first").appendTo($(".test"));
$(".test ul").css("marginTop", 0);
};
var animate = function(){
$(".test ul").eq(0).animate({
marginTop: -lineH
},500,appendTo)
};
var delayer = setInterval(animate, 2000);
})()
});
</script>
</head>
<body>
<p align="center"><strong>特效效果如下：</strong></p>
<p> </p>
<div class="scrollbox">
<div id="scrollDiv">
<ul>
<li><h3><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="linktit">移动娱乐业务突飞</a></h3></li>
<li><h3><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="linktit">不停转动向上滚动可控制向上向下滚动特效</a></h3> <div>DIV CSS JS自动不断向上一个一个滚动可控制向上向下滚动特效... </div></li>
<li><h3><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="linktit">全国涂料总产量呈现直线下滑态势</a></h3> <div>我国涂料工业将面临涂料消费税征收全面铺开，环保压力持续增加，2015年的形势不容乐观... </div></li>
<li><h3><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="linktit">镂空渔网超吸睛</a></h3> <div>镂空罩衫，短短的版型穿起来显高又俏皮，内搭长款连衣裙，非常大方哦... </div></li>
<li><h3><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="linktit">主题创业街亮相</a></h3> <div>目前已有包括咖啡厅、酒吧、餐厅、瑜伽室在内的8家商铺入驻该火车... </div></li>
</ul>
</div>
<div class="scroltit"><div class="updown" id="but_down">向上</div><div class="updown" id="but_up">向下</div></div>
</div>
<div class="test">
<ul>
<li>sections1</li>
<li>sections2</li>
<li>sections3</li>
<li>sections4</li>
</ul>
</div>
</body>
</html>
下面是jq插件源码
/*
jQ向上滚动带上下翻页按钮
*/
(function($){
$.fn.extend({
Scroll:function(opt,callback){
//参数初始化
if(!opt) var opt={};
var _btnUp = $("#" opt.up);//Shawphy:向上按钮
var _btnDown = $("#" opt.down);//Shawphy:向下按钮
var timerID;
var _this=this.eq(0).find("ul:first");
var lineH=_this.find("li:first").height(), //获取行高,此处行高固定但是当文字伟一行或者两行时，要动态获取吧？？
line=opt.line?parseInt(opt.line,10):parseInt(this.height()/lineH,10), //每次滚动的行数，默认为一屏，即父容器高度
speed=opt.speed?parseInt(opt.speed,10):500; //卷动速度，数值越大，速度越慢（毫秒）
timer=opt.timer //?parseInt(opt.timer,10):3000; //滚动的时间间隔（毫秒）
if(line==0) line=1;
var upHeight=0-line*lineH;
//滚动函数
var scrollUp=function(){
_btnUp.unbind("click",scrollUp); //Shawphy:取消向上按钮的函数绑定
_this.animate({
//当滚动的元素height为max-height时，实时获取元素height
marginTop:-_this.find("li:first").height()
},speed,function(){
// for(i=1;i<=line;i ){
// _this.find("li:first").appendTo(_this);
// }
_this.find("li:first").appendTo(_this);
_this.css({marginTop:0});
_btnUp.bind("click",scrollUp); //Shawphy:绑定向上按钮的点击事件
});
}
//Shawphy:向下翻页函数
var scrollDown=function(){
_btnDown.unbind("click",scrollDown);
for(i=1;i<=line;i ){
_this.find("li:last").show().prependTo(_this);
}
_this.css({marginTop:-_this.find("li:first").height()});
_this.animate({
marginTop:0
},speed,function(){
_btnDown.bind("click",scrollDown);
});
}
//Shawphy:自动播放
var autoPlay = function(){
if(timer)timerID = window.setInterval(scrollUp,timer);
};
var autoStop = function(){
if(timer)window.clearInterval(timerID);
};
//鼠标事件绑定
_this.hover(autoStop,autoPlay).mouseout();
_btnUp.css("cursor","pointer").click( scrollUp ).hover(autoStop,autoPlay);//Shawphy:向上向下鼠标事件绑定
_btnDown.css("cursor","pointer").click( scrollDown ).hover(autoStop,autoPlay);
}
})
})(jQuery);
另外再贴一份，删改之后的脚本
/*
jQ向上滚动带上下翻页按钮
*/
(function($){
$.fn.extend({
txtScroll:function(opt,callback){
//参数初始化
if(!opt) var opt={};
var _btnUp = $("#" opt.up);//Shawphy:向上按钮
var _btnDown = $("#" opt.down);//Shawphy:向下按钮
var timerID;
var _this=this.eq(0).find("ul:first");
speed=opt.speed?parseInt(opt.speed,10):500; //卷动速度，数值越大，速度越慢（毫秒）
timer=opt.timer?parseInt(opt.timer,10):2000; //滚动的时间间隔（毫秒）
//滚动函数
var scrollUp=function(){
_btnUp.unbind("click",scrollUp); //Shawphy:取消向上按钮的函数绑定
_this.animate({
//当滚动的元素height为max-height时，实时获取元素height
marginTop: -_this.find("li:first").height()
},speed,function(){
_this.find("li:first").appendTo(_this);
_this.css({"marginTop":0});
_btnUp.bind("click",scrollUp); //Shawphy:绑定向上按钮的点击事件
});
}
//Shawphy:向下翻页函数
var scrollDown=function(){
_btnDown.unbind("click",scrollDown);
_this.find("li:last").show().prependTo(_this);
_this.css({marginTop:-_this.find("li:first").height()});
_this.animate({
marginTop:0
},speed,function(){
_btnDown.bind("click",scrollDown);
});
}
//Shawphy:自动播放
var autoPlay = function(){
if(timer) setIntervalT = window.setInterval(scrollUp,timer);
};
var autoStop = function(){
if(timer)window.clearInterval(setIntervalT);
};
//鼠标事件绑定
_this.hover(autoStop,autoPlay).mouseout();
_btnUp.css("cursor","pointer").click( scrollUp ).hover(autoStop,autoPlay);//Shawphy:向上向下鼠标事件绑定
_btnDown.css("cursor","pointer").click( scrollDown ).hover(autoStop,autoPlay);
}
})
})(jQuery);
运行效果如下：
更多关于jQuery相关内容感兴趣的读者可查看本站专题：《jQuery常用插件及用法总结》、《jQuery扩展技巧总结》、《jQuery拖拽特效与技巧总结》、《jQuery常见经典特效汇总》、《jQuery动画与特效用法总结》及《jquery选择器用法总结》
希望本文所述对大家jQuery程序设计有所帮助。