Aug
11
2009

javascript焦点图片幻灯效果

An article by dreamer

IE里有个渐变的滤镜可以做幻灯效果，但由于Firefox下，这些滤镜全部失去了光彩，一点效果也没了。

目前网上的焦点图片主要有两种，一种是flash做的，切换的很好看，但开启新窗口时容易被当作广告拦截；另一种是js做的，但效果不够好，由于FF对滤镜不支持，在FF下切换时没有效果，包括以前的新浪、MSN、腾讯图片新闻(http://news.qq.com/)等的图片基本都是这样，IE下用滤镜，FF下无效果，直接切换。

最近发现用js做的焦点图片有所改进，比如超级玩家DOTA专题站上部的图片(http://dota.sgamer.com/Home)。好了，不多说了，直接上代码：

HTML代码

<!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″ /> <style type=”text/css” media=”all”> .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”> /* power by: http://www.wxwdesign.cn */ //主函数 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” //焦点轮换图片容器的id名称 //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);} //控制图层透明度 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> <title>Javascript图片幻灯效果——wxwdesign.cn</title> </head> <body> <div id=”fade_focus”> <div>Loading…<br /><img src=”http://www.wxwdesign.cn/attachments/month_0809/v2008925193118.gif” width=”100″ height=”100″ /></div> <ul> <li><img src=”http://www.wxwdesign.cn/Down/flash/flash_show/images/1.jpg” width=”443″ height=”209″ alt=”展示图片1″ /></li> <li><img src=”http://www.wxwdesign.cn/Down/flash/flash_show/images/2.jpg” width=”443″ height=”209″ alt=”展示图片2″ /></li> <li><img src=”http://www.wxwdesign.cn/Down/flash/flash_show/images/3.jpg” width=”443″ height=”209″ alt=”展示图片3″ /></li> <li><img src=”http://www.wxwdesign.cn/Down/flash/flash_show/images/4.jpg” width=”443″ height=”209″ alt=”展示图片4″ /></li> </ul> </div> </body> </html>

[Ctrl+A 全部选择提示：你可先修改部分代码，再按运行]

在蓝色论坛里又修改了一下，文字的渐变效果：

HTML代码

<!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″ /> <style type=”text/css” media=”all”> .d1{width:443px;height:auto;overflow:hidden;border:#666666 1px solid;background-color:#000000;position:relative;font-family:Arial, Helvetica, sans-serif,”宋体”;} .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:100px;overflow:hidden;text-align:center;font-weight:bold;font-size:22px;padding-top:22px;} .d2 a:link,.d2 a:visited{color:#FFFFFF;text-decoration:none;} .d2 a:hover{color:#FFFFFF;text-decoration:underline;} .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 a{color:#FFFFFF;text-decoration:none;} .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”> /* power by: http://www.wxwdesign.cn */ //主函数 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” //焦点轮换图片容器的id名称 //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);} //控制图层透明度 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=li[j].innerHTML;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> <title>Javascript图片幻灯效果——wxwdesign.cn</title> </head> <body> <div id=”fade_focus”> <div>Loading…<br /><img src=”http://www.wxwdesign.cn/attachments/month_0809/v2008925193118.gif” width=”100″ height=”100″ /></div> <ul> <li><a href=”http://www.wxwdesign.cn” target=”_blank”>Collaboration Solutions</a></li> <li><a href=”http://www.wxwdesign.cn” target=”_blank”>Systems Management</a></li> <li><a href=”http://www.wxwdesign.cn” target=”_blank”>Virtualization</a></li> <li><a href=”http://www.wxwdesign.cn” target=”_blank”>Linux</a></li> </ul> </div> </body> </html>

[Ctrl+A 全部选择提示：你可先修改部分代码，再按运行]

HTML代码

<!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″ /> <style type=”text/css” media=”all”> .d1{width:443px;height:auto;overflow:hidden;border:#666666 1px solid;background-color:#000000;position:relative;font-family:Arial, Helvetica, sans-serif,”宋体”;} .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:100px;overflow:hidden;text-align:center;font-weight:bold;font-size:22px;padding-top:22px;} .d2 a:link,.d2 a:visited{color:#FFFFFF;text-decoration:none;} .d2 a:hover{color:#FFFFFF;text-decoration:underline;} .num_list{position:absolute;width:100%;left:0px;bottom:-1px;background-color:#FF9900;color:#FFFFFF;font-size:12px;padding:4px 0px;height:20px;overflow:hidden;} img{border:0px;} ul{display:none;} .button{position:absolute; z-index:1000; right:0px; bottom:2px; font-size:12px; font-weight:bold;} .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”> /* power by: http://www.wxwdesign.cn */ //主函数 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” //焦点轮换图片容器的id名称 //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 button=document.createElement(“div”);var left=document.createElement(“a”);var right=document.createElement(“a”);button.className=”button”;var br=function(obj,n,dir){obj.className=”b1″;obj.innerHTML=dir; obj.onclick=function(){clearTimeout(timer);clearTimeout(timer2);clearTimeout(timer3);j+=n;if(j==li.length){j=0}else if(j<0){j=li.length-1};t=63;opac=0;fadeon()}; obj.onmouseover=function(){this.className=”b2″}; obj.onmouseout=function(){this.className=”b1″}}; br(left,-1,”L”);br(right,1,”R”);button.appendChild(left);button.appendChild(right); //控制图层透明度 function alpha(obj,n){if(document.all) {obj.style.filter=”alpha(opacity=”+n+”)”;}else{obj.style.opacity= (n/100);}} id.className=”d1″;div.className=”d2″;id.appendChild(div); id.appendChild(button); //渐显 var fadeon=function(){opac+=5;div.innerHTML=li[j].innerHTML;alpha(div,opac); 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(opac>0) {timer=setTimeout(fadeout,interv2)}else{if(j<li.length-1) {j++}else{j=0};fadeon()};} fadeon(); } //初始化 window.onload=s; </script> <title>Javascript图片幻灯效果——wxwdesign.cn</title> </head> <body> <div id=”fade_focus”> <div>Loading…<br /><img src=”http://www.wxwdesign.cn/attachments/month_0809/v2008925193118.gif” width=”100″ height=”100″ /></div> <ul> <li><a href=”http://www.wxwdesign.cn” target=”_blank”>Collaboration Solutions</a></li> <li><a href=”http://www.wxwdesign.cn” target=”_blank”>Systems Management</a></li> <li><a href=”http://www.wxwdesign.cn” target=”_blank”>Virtualization</a></li> <li><a href=”http://www.wxwdesign.cn” target=”_blank”>Linux</a></li> </ul> </div> </body> </html>

[Ctrl+A 全部选择提示：你可先修改部分代码，再按运行]

[本日志由 admin 于 2009-02-18 01:10 PM 编辑]
文章来自: wxwdesign opacity