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一个比较经典的JavaScript图片轮番切换代码，使用相当方便，图片列表完全可以由你从数据库中取出，这使得你有可能将其布置到你的后台管理程序中，比如可以适时从本地上传图片，由前台程序读出数据库路径，而不用更改JS代码，这样会方便很多。
<!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> <title>经典的图片幻灯</title> <style type="text/css"> .d1{width:443px;height:auto;overflow:hidden;border:#666666 2px solid;background-color:#000000;position:relative;} .loading{width:443px;border:#666666 2px solid;background-color:#000000;color:#FFCC00;font-size:12px;height:179px;text-align:center;padding-top:30px;font-family:Verdana, Arial, Helvetica, sans-serif;font-weight:bold;} .d2{width:100%;height:209px;overflow:hidden;} .num_list{position:absolute;width:100%;left:0px;bottom:-1px;background-color:#000000;color:#FFFFFF;font-size:12px;padding:4px 0px;height:20px;overflow:hidden;} .num_list span{display:inline-block;height:16px;padding-left:6px;} img{border:0px;} ul{display:none;} .button{position:absolute; z-index:1000; right:0px; bottom:2px; font-size:13px; font-weight:bold; font-family:Arial, Helvetica, sans-serif;} .b1,.b2{background-color:#666666;display:block;float:left;padding:2px 6px;margin-right:3px;color:#FFFFFF;text-decoration:none;cursor:pointer;} .b2{color:#FFCC33;background-color:#FF6633;} </style> <script language="javascript" type="text/javascript"> var s=function(){ var interv=2000; //切换间隔时间 var interv2=10; //切换速速 var opac1=80; //文字背景的透明度 var source="fade_focus" //图片容器id //获取对象 function getTag(tag,obj){if(obj==null){return document.getElementsByTagName(tag)}else{return obj.getElementsByTagName(tag)}} function getid(id){return document.getElementById(id)}; var opac=0,j=0,t=63,num,scton=0,timer,timer2,timer3;var id=getid(source);id.removeChild(getTag("div",id)[0]);var li=getTag("li",id);var div=document.createElement("div");var title=document.createElement("div");var span=document.createElement("span");var button=document.createElement("div");button.className="button";for(var i=0;i<li.length;i++){var a=document.createElement("a");a.innerHTML=i+1;a.onclick=function(){clearTimeout(timer);clearTimeout(timer2);clearTimeout(timer3);j=parseInt(this.innerHTML)-1;scton=0;t=63;opac=0;fadeon();};a.className="b1";a.onmouseover=function(){this.className="b2"};a.onmouseout=function(){this.className="b1";sc(j)};button.appendChild(a);} //控制透明度 function alpha(obj,n){if(document.all){obj.style.filter="alpha(opacity="+n+")";}else{obj.style.opacity=(n/100);}} //控制焦点按钮 function sc(n){for(var i=0;i<li.length;i++){button.childNodes[i].className="b1"};button.childNodes[n].className="b2";} title.className="num_list";title.appendChild(span);alpha(title,opac1);id.className="d1";div.className="d2";id.appendChild(div);id.appendChild(title);id.appendChild(button); //渐显 var fadeon=function(){opac+=5;div.innerHTML=li[j].innerHTML;span.innerHTML=getTag("img",li[j])[0].alt;alpha(div,opac);if(scton==0){sc(j);num=-2;scrolltxt();scton=1};if(opac<100){timer=setTimeout(fadeon,interv2)}else{timer2=setTimeout(fadeout,interv);};} //渐隐 var fadeout=function(){opac-=5;div.innerHTML=li[j].innerHTML;alpha(div,opac);if(scton==0){num=2;scrolltxt();scton=1};if(opac>0){timer=setTimeout(fadeout,interv2)}else{if(j<li.length-1){j++}else{j=0};fadeon()};} //滚动文字 var scrolltxt=function(){t+=num;span.style.marginTop=t+"px";if(num<0&&t>3){timer3=setTimeout(scrolltxt,interv2)}else if(num>0&&t<62){timer3=setTimeout(scrolltxt,interv2)}else{scton=0}}; fadeon(); } //初始化 window.onload=s; </script> </head> <body> <div id="fade_focus"> <div class="loading">Loading...<br /><img src="http://p1.mb5u.com/texiao/1/20110225160506306.gif"></div> <ul> <li><img src="http://p1.mb5u.com/texiao/20110225160506311.jpg" width="443" height="209" alt="图片焦点切换第一张文字" /></li> <li><img src="http://p1.mb5u.com/texiao/20110225160506312.jpg" width="443" height="209" alt="图片焦点切换第二张文字" /></li> <li><img src="http://p1.mb5u.com/texiao/20110225160506313.jpg" width="443" height="209" alt="图片焦点切换第三张文字" /></li> <li><img src="http://p1.mb5u.com/texiao/20110225160506314.jpg" width="443" height="209" alt="图片焦点切换第四张文字" /></li> </ul> </div> </body> </html>