JS 仿淘宝幻灯片非完整版小案例

仿淘宝幻灯片,基础版,后期效果是要做到每次点击小圆点,切换都无缝
  1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
  2 "http://www.w3.org/TR/html4/strict.dtd">
  3 
  4 <html xmlns="http://www.w3.org/1999/xhtml" lang="en">
  5     <head>
  6         <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  7         <title>4.淘宝幻灯片</title>
  8         <meta name="author" content="Administrator" />
  9         <!-- Date: 2014-12-11 -->
 10         <style>
 11             *{margin:0;padding:0}
 12             #div1{width:400px;height:215px;  border:1px solid red;margin:40px auto; overflow:hidden;position:relative }
 13             ul{position:absolute;left:0;top:0}
 14             li{list-style:none;float:left; position: relative}
 15             li.active{background:red}
 16             li.active2{border:1px solid red}
 17             li img{width:400px;}
 18             ol{position:absolute}
 19             ol li{width:15px;height:15px;border-radius:10px;background:#808080;margin:0 3px}
 20             .t{position:absolute;font-size:80px;z-index:2;left:200px;top:100px;color:red;width:100px;height:100px;background:#fff;text-align:center; border:1px solid black}
 21         </style>
 22         <script>
 23             window.onload=function(){
 24                  var oDiv1=document.getElementById('div1');
 25                  var oUl=oDiv1.getElementsByTagName('ul')[0];
 26                  var aLi=oUl.getElementsByTagName('li');
 27                  var arr=['3-images/1.jpg','3-images/2.jpg','3-images/3.jpg','3-images/4.jpg','3-images/5.jpg'];
 28                  var arr1=['1','2','3','4','5'];
 29                  oUl.style.width = aLi.length * aLi[0].offsetWidth +'px';
 30                  
 31                  var oL=document.createElement('ol');
 32                  var str='';
 33                  for( var i=0;i<aLi.length;i++ ){
 34                      
 35                      str += '<li></li>' 
 36                  }
 37                  oL.innerHTML=str;
 38                  oDiv1.appendChild( oL );
 39                  document.title = oDiv1.offsetWidth +'-'+oL.offsetWidth;
 40                  oL.style.left = (oDiv1.offsetWidth - oL.offsetWidth)/2 +'px';
 41                  oL.style.bottom='0px';
 42                  var aLi1=oL.getElementsByTagName('li');
 43                  
 44                  var timer=null;
 45                  var num=0;
 46                  
 47                  function init(){
 48                      for(var i=0;i<aLi1.length;i++){
 49                          aLi1[i].className=''
 50                      }
 51                      aLi1[num].className='active'
 52                  }
 53                  init();
 54                  function slide(){
 55                      num++;
 56                      if(num>=aLi.length) {
 57                            num=0;
 58                            oUl.style.left = 0;
 59                      }
 60                      init();
 61                      hcMove(oUl,{
 62                          'left':-400*num
 63                      })
 64                  }
 65                  timer=setInterval(function(){
 66                      slide()
 67                  },1000)
 68                  
 69                   oDiv1.onmouseover=function(){
 70                          clearInterval(timer)
 71                      }
 72                  oDiv1.onmouseout=function(){
 73                      timer=setInterval(function(){
 74                          slide()
 75                      },1000)
 76                  }
 77                 for(var i=0;i<aLi.length;i++){
 78                     aLi1[i].index=i;
 79                     aLi1[i].onclick=function(){
 80                          num = this.index;
 81                          init();
 82                          hcMove(oUl,{'left':-400*num})
 83                     }
 84                 }
 85                  
 86                  
 87                  
 88             }
 89             function css(obj,attr) {
 90                 return obj.currentStyle ? obj.currentStyle[attr] : getComputedStyle(obj)[attr]
 91             }
 92             /**完美 缓冲运动 带opacity**/
 93 function hcMove(obj,json,fn){
 94                 clearInterval( obj.timer );
 95                  
 96                 obj.timer=setInterval(function(){
 97                     var iBtn=true;  
 98                     
 99                     for(var attr in json){
100                         var target=json[attr];
101                         
102                         if( attr == 'opacity' ){
103                             var iSpeed = (target-Math.round(css(obj,attr))*100)/6;
104                         }else{
105                             var iSpeed = (target-parseInt(css(obj,attr)))/6;
106                         }
107                         
108                          
109                          iSpeed = iSpeed > 0 ? Math.ceil(iSpeed)  : Math.floor(iSpeed);//速度取整,因为js中的小数是经过计算的,默认四舍五入,但是不够0.5的就不会动了
110                          
111                          if( parseInt(css(obj,attr)) != target ){
112                               iBtn=false;//如果有运动没到达目标点,iBtn为false
113                               
114                               if( attr == 'opacity' ){
115                                   var sNow=Math.round(css(obj,attr)*100) + iSpeed;
116                                   
117                                   //先做处理 再赋值
118                                   if( sNow > target && iSpeed >0 || sNow < target && iSpeed <0 ){
119                                       sNow = target
120                                   }
121                                   
122                                   obj.style[attr] = sNow/100;
123                                   obj.style.filter = 'alpha(opacity='+sNow+')';
124                               }else{
125                                   
126                                   var sNow = parseInt(css(obj,attr)) + iSpeed;
127                                   
128                                   //先做处理 再赋值
129                                   if( sNow > target && iSpeed >0 || sNow < target && iSpeed <0 ){
130                                       sNow = target
131                                   }
132                                   obj.style[attr] = sNow +'px';
133                               }
134  
135                          }
136 
137                         }
138                         
139                         if(iBtn){ //如果运动全部完成,iBtn为true
140                             clearInterval(obj.timer);
141                             fn && fn()
142                         }
143  
144                 },30)
145             }
146 
147         </script>
148     </head>
149     <body>
150          <div id="div1">
151              <ul>
152                 <li mars='1'><img src="3-images/1.jpg"><span    class="t">1</span></li>
153                 <li mars='2'><img src="3-images/2.jpg"><span    class="t">2</span></li>
154                 <li mars='3'><img src="3-images/3.jpg"><span    class="t">3</span></li>
155                 <li mars='4'><img src="3-images/4.jpg"><span    class="t">4</span></li>
156                 <li mars='5'><img src="3-images/5.jpg"><span    class="t">5</span></li>
157             </ul>
158          </div>     
159     </body>
160 </html>
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JS 仿淘宝幻灯片 非完整版 小案例

JS 仿淘宝幻灯片非完整版小案例
