CSS+Js遮罩效果的TAB及焦点图片切换(推荐)

更新时间：2009年11月08日 22:11:10 作者：

CSS+Js图片切换技术，类似的已有不少了，这一个使用了遮罩过渡的效果，同样应用到了TAB选项卡上，本页面仅是为了演示，大家用时候把它拆分开来，这个效果也对学习图片效果制作很有帮助。

<!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=gb2312" /> <title>Js遮罩效果的TAB及图片切换</title> <style> div, ul, ol, li, dl, dt, dd { margin:0; padding:0; } .imgFlash,.tab{margin:auto} /*------焦点图片的css-------*/ .imgFlash { height:230px;width:270px; position:relative; } .imgFlash dl {     height:100%;     overflow:hidden;     position:absolute;     width:100%; } .imgFlash img {     height:100%;     position:absolute;     width:100%;     background-color: #FFFFFF;     background-repeat: no-repeat;     background-position: center center; } .imgFlash dt { bottom:0; font-size:12px; height:24px;line-height:24px; left:0; position:absolute; width:100%; z-index:1; } .imgFlash dt span {     background-color:#000000;     height:100%;     opacity:0.4;filter:Alpha(Opacity=40);     position:absolute;     width:100%; } .imgFlash dt a { color:#FFFFFF; position:absolute; text-decoration:none; text-indent:5px; z-index:1; } .imgFlash dt a:hover { text-decoration:underline; } .imgFlash div { bottom:8px; cursor:pointer; display:block; position:absolute; right:8px; z-index:99999; } .imgFlash div em { background-color:#000000; border:1px solid #FFFFFF; display:block; float:right; height:4px; margin-right:3px; filter:Alpha(Opacity=50);opacity:0.5; overflow:hidden; width:4px; } .imgFlash div em.d {/*激活的小方块的样式*/ background-color:#CC0000; filter:Alpha(Opacity=80); opacity:0.8; } /*-------------------------Tab的css----------------------------*/ .tab,.tab ul{list-style-type: none;} .tab{     width:270px;     background-color:#FFFFFF;     height: 160px;     font-size: 12px;     position: relative;     border-top-width: 30px;     border-right-width: 1px;     border-bottom-width: 1px;     border-left-width: 1px;     border-top-style: solid;     border-right-style: solid;     border-bottom-style: solid;     border-left-style: solid;     border-top-color: #0066FF;     border-right-color: #0066FF;     border-bottom-color: #0066FF;     border-left-color: #0066FF; } .tab ul {     position: absolute;     top: -30px; } .tab li{     float:left;     background-color:#A9CEEB;     background-repeat:no-repeat;     background-position:left top;     margin-top:5px;     margin-left: 5px; } .tab li.d {     background-color: #FFFFFF; } .tab li a{text-decoration:none;display:block;padding-right:8px;padding-left:8px;line-height:25px;color:#2B6FA2;} .tab li.d a{color:#0C3E74;} .tab li ul{     border-bottom-style:none;     position:absolute;     left:0px;     top:30px;     background-color: #FFFFFF;     padding-top: 10px;     width: 270px; } .tab li li{     float:none;     background-image:none;     margin:0px;     background-color: #FFFFFF; } .tab li li a{     background-image:none;     line-height:22px;     color: #000000;     float: none;     height: 22px; } .tab li ul li a:hover{text-decoration:underline;} .tab li.d li a{color:#000000;} </style> <script language="javascript"> var $ = function (d){return document.getElementById( d );}; var isIE = (document.all) ? true : false; var Bind = function (obj,fun,arr){return function() {arr || (arr = arguments);return fun.apply(obj,arr);}};//绑定 var Tween = function(t,b,c,d){return c*t/d + b;};//缓冲函数 function addEventHandler(oTarget, sEventType, fnHandler) {if (oTarget.addEventListener) {oTarget.addEventListener(sEventType, fnHandler, false);} else if (oTarget.attachEvent) {oTarget.attachEvent("on" + sEventType, fnHandler);} else {oTarget["on" + sEventType] = fnHandler;     } };//事件监听 function removeEventHandler(oTarget, sEventType, fnHandler) { if (oTarget.removeEventListener) { oTarget.removeEventListener(sEventType, fnHandler, false); } else if (oTarget.detachEvent) { oTarget.detachEvent("on" + sEventType, fnHandler); } else { oTarget["on" + sEventType] = null; } };//移除监听 var Timer = {};//Timer Timer.add = function (fn){return new this.fn(fn)}; Timer.fn = function (fn){ var timer; this.play = function (speed,only){ speed || ( speed = 10 );     if(only)timer = window.setTimeout(fn,speed); else timer = window.setInterval(fn,speed); }; this.stop = function (){clearTimeout(timer);clearInterval(timer)}; }; //Mask 遮罩动画 var Mask = function (){      this.fl = Timer.add(Bind(this,this.fn));      this.from_num = 0;      this.speed = 50;//动画速度，越大越慢 }; Mask.prototype.ready = function (ele,pos){ if(this.ele)this.set(this.maxWidth,this.maxHeight); this.ele = ele; this.maxWidth = this.ele.offsetWidth;      this.maxHeight = this.ele.offsetHeight;      this.ele.style.position = "absolute";      this.from_num = 0;      if(!pos){          var x = ["left","center","right",""][parseInt(4*Math.random())], y = ["top","center","bottom",""][parseInt(4*Math.random())];         if(x == "" && y == "")x = "left";//避免同时为""          this.position = [x,y];              }else{      this.position = pos;      }      this.set(0,0);      this.fl.stop(); }; Mask.prototype.start = function (){this.fl.play();}; Mask.prototype.stop = function (){this.fl.stop();}; Mask.prototype.set = function (width,height){//设置遮罩的矩形，用于定位遮罩的变换方向 var t,r,b,l;     switch(this.position[0]){      case "left" :      l = 0;          r = width;          break;      case "center" :      l = (this.maxWidth - width)/2;          r = (this.maxWidth + width)/2;          break;      case "right" :      l = this.maxWidth - width;          r = this.maxWidth;          break;      default:      l = 0;          r = this.maxWidth;          } switch(this.position[1]){      case "top" :      t = 0;          b = height;          break;      case "center" :      t = (this.maxHeight - height)/2;          b = (this.maxHeight + height)/2;          break;      case "bottom" :      t = this.maxHeight - height;          b = this.maxHeight;          break;      default :      t = 0;          b = this.maxHeight;          break;         }     this.ele.style.clip = "rect("     + t + "px,"     + r + "px,"     + b + "px,"     + l + "px)" ; }; Mask.prototype.fn = function (){ var w,h; this.from_num ++ ;      if(this.from_num<=this.speed){      w = Tween(this.from_num,0,this.maxWidth,this.speed);         h = Tween(this.from_num,0,this.maxHeight,this.speed);         this.set(w,h);      }else{      this.fl.stop();         //this.start();//若不需要重复动画，把这句注释，上句不注释      }      }; function ImgFlash(box){ this.box = box.getElementsByTagName("dl");         this.ge = 4;//切换间隔秒数         this.menu = [];         this.mask = new Mask();//加载遮罩动画，不设置参数 即 随机效果         this.zIndex = this.box.length;         var _div = document.createElement('div');         this.dang = 0;         for(i=0;i<this.zIndex;i++){             this.box[i].style.zIndex = this.zIndex-i;             var _em = document.createElement('em'),_span = document.createElement('span');             var _dt = this.box[i].getElementsByTagName("dt")[0];             _dt.appendChild(_span);             addEventHandler(_em,'mouseover',Bind(this,this.emEvent,[this.zIndex-i-1,true]));             _div.appendChild(_em);             this.menu.push(_em);             if(this.zIndex-i==1){             _em.className = 'd';             }         }         box.appendChild(_div);         addEventHandler(box,'mouseover',Bind(this,function(){this.fl.stop()}));         addEventHandler(box,'mouseout',Bind(this,function(){this.fl.play(this.ge*1000)}));         this.fl = Timer.add(Bind(this,this.enterFrame))         this.fl.play(this.ge*1000); } ImgFlash.prototype.enterFrame = function(){ var ddd = this.dang==2?0:this.dang+1;         this.emEvent(ddd);     }; ImgFlash.prototype.emEvent = function (index,b){         if(b)this.fl.stop();         if(index == this.dang)return;         this.menu[this.menu.length-1-this.dang].className="";         var odl = this.box[this.dang];         this.zIndex++;         this.dang = index;         this.menu[this.menu.length-1-this.dang].className="d";         var ndl = this.box[this.dang];         var img = ndl.getElementsByTagName("img")[0];         this.mask.ready(img);         this.mask.start();         ndl.style.zIndex = this.zIndex; } function Tab(id,type){ var nav = id.getElementsByTagName("ul")[0].childNodes; var _nav,i=0; this.mask = new Mask();//初始化遮罩动画 this.z = 1000; while(_nav = nav[i++]){ if(_nav.className=="d")this.focusEle = _nav; if(_nav.childNodes.length>1){ var A = _nav.getElementsByTagName("A")[0]; addEventHandler(A,type,Bind(this,fun,[A])); } if(_nav.nodeType == 1)_nav.getElementsByTagName("UL")[0].style.zIndex = nav.length-i; } function fun(ele){ var li = ele.parentNode; var ul = li.getElementsByTagName("UL")[0]; this.z += 1 ul.style.zIndex = this.z; if(li.className=="d")return; li.className+=(li.className.length>0? " ": "") + "d"; this.focusEle.className=this.focusEle.className.replace(/( ?|^)d\b/g, ""); this.focusEle = li; this.mask.ready(ul); this.mask.start(); }; } </script> </head> <body> <div class="imgFlash" id="box">      <dl>      <dt><a href="#">神秘花园</a></dt>     <dd><a href="#"><img src="//img.jbzj.com/demoimg/200911/wall_s1.jpg" border="0" /></a></dd>      </dl>      <dl>      <dt><a href="#">脚本之家演示</a></dt>     <dd><a href="#"><img src="//img.jbzj.com/demoimg/200911/wall_s2.jpg" border="0" /></a></dd>      </dl>      <dl>      <dt><a href="#">人间仙境</a></dt>     <dd><a href="#"><img src="//img.jbzj.com/demoimg/200911/wall_s3.jpg" border="0" /></a></dd>      </dl> </div>     <div class="tab" id="tab1"> <ul> <li class="d"><a href="javascript:;">WEB前端</a> <ul> <li><a href="/soft/6675.shtml" target="_blank">VB封装一个文本文件读写类含示例</a></li><li><a href="/soft/6680.shtml" target="_blank">Csdn网站右下角的滑出弹出提示（带关闭功能）</a></li><li><a href="/soft/6668.shtml" target="_blank">VC++做的精美仿XP开始菜单</a></li><li><a href="/soft/6660.shtml" target="_blank">VB+Access学生综合档案管理系统</a></li><li><a href="/soft/6669.shtml" target="_blank">Delphi随机抽取幸运观众Access数据库版</a></li><li><a href="/soft/6665.shtml" target="_blank">多线程的VC++高速文件搜索代码</a></li> </ul> </li> <li><a href="javascript:;">源码下载</a>     <ul>      <li><a href="/soft/6638.shtml" target="_blank">15个jQuery学习实例（菜单、滚动、层隐藏等）</a></li><li><a href="/soft/6647.shtml" target="_blank">VB取汉字拼音首码（第一个字母）源码</a></li><li><a href="/soft/6646.shtml" target="_blank">VB 多进制转换源程序</a></li><li><a href="/soft/6657.shtml" target="_blank">杰奇网站管理系统 JIEQI CMS v1.7</a></li> </ul> </li> <li><a href="javascript:;">短标题</a>     <ul>     <li><a href="/soft/2182.shtml" target="_blank">Delphi版视频监控系统</a></li><li><a href="/soft/1852.shtml" target="_blank">《Java2核心技术卷2:高级特性》第7版中文高清 PDF</a></li><li><a href="/soft/2674.shtml" target="_blank">基于Delphi的HIS自动更新程序 v2.0</a></li><li><a href="/soft/2972.shtml" target="_blank">C#早期开发的摄像头监控系统源码</a></li><li><a href="/soft/3715.shtml" target="_blank">随机密码生成器VC++源程序</a></li> </ul> </li> <li><a href="javascript:;">更短</a> <ul> <li><a href="/soft/4561.shtml" target="_blank">C# 酒店管理（SQL2005）</a></li><li><a href="/soft/3041.shtml" target="_blank">云台C#家庭视频监控系统完整版</a></li><li><a href="/soft/3228.shtml" target="_blank">VS2008开发的C#高校宿舍管理系统</a></li><li><a href="/soft/3330.shtml" target="_blank">C#落雪无痕IP端口扫描器VS2005</a></li><li><a href="/soft/4339.shtml" target="_blank">火狐浏览器 Firefox v3.5</a></li> </ul> </li> </ul> </div> <script> new ImgFlash($("box"));//初始化 new Tab($("tab1"),"mouseover"); </script> </body> </html>

[Ctrl+A 全选注:引入外部Js需再刷新一下页面才能执行]

其实这个不只是效果，代码也是非常值得学习的。大家主要是注意页面最下面的代码
<script>
new ImgFlash($("box"));//初始化
new Tab($("tab1"),"mouseover");
</script>

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