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。
Peter-Zhu
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