简单焦点轮播(一)

最简单轮播形式，1）js中通过pic的display属性控制变换2）也可通过调整Pic的margin-Left

效果如图：

  1 <!DOCTYPE html>
  2 <html>
  3 <head lang="en">
  4     <meta charset="UTF-8">
  5     <title></title>
  6     <style type="text/css">
  7 *{
  8     margin: 0;
  9     padding: 0;
 10     list-style: none;
 11     text-decoration: none;
 12 }
 13         .wrap{
 14              490px;
 15             height: 170px;
 16             margin: 100px auto;
 17             border: 1px solid #000000;
 18             position: relative;
 19             overflow: hidden;
 20         }
 21         #pic{
 22              2450px;
 23             height: 170px;
 24         }
 25         #pic li{
 26             float: left;
 27         }
 28         #list{
 29             position: absolute;
 30             bottom: 10px;
 31             left:150px ;
 32         }
 33         #list li{
 34             float: left;
 35              15px;
 36             height: 15px;
 37             background: #fff;
 38             margin: 0 10px;
 39             border-radius: 50%;
 40             cursor: pointer;
 41         }
 42         #list .on{
 43             background: #e27a00;
 44         }
 45         .Prev{
 46             top: 30px;
 47             left: 0;
 48         }
 49         .Next{
 50             top: 30px;
 51             right: 0;
 52         }
 53         .Prev,.Next{
 54             position: absolute;
 55             font-size: 80px;
 56             font-weight: bold;
 57             color:#fff ;
 58             -webkit-transition: all 0.35s ease-in-out
 59         }
 60         .Next:hover,
 61         .Prev:hover{
 62             background: #ccc;
 63             background: rgba(204, 204, 204, 0.4);
 64         }
 65         .show{
 66             display: block;
 67         }
 68         .hidden{
 69             display: none;
 70         }
 71     </style>
 72     <script type="text/javascript">
 73         window.onload=function(){
 74             var pic=document.getElementById('pic').getElementsByTagName('li');
 75             var list=document.getElementById('list').getElementsByTagName('li');
 76             var prev=document.getElementById('Prev');
 77             var next=document.getElementById('Next');
 78             var index=0;
 79             var timer=null;
 80 
 81             auto();
 82             for(var i=0;i<list.length;i++){
 83                 list[i].index=i;
 84                 list[i].onmouseover=function(){
 85                     clearInterval(timer);
 86                     Change(this.index);
 87                 }
 88                 list[i].onmouseout=function(){
 89                     auto();
 90                 }
 91                 pic[i].onmouseover=function(){
 92                     clearInterval(timer);
 93                 }
 94                 pic[i].onmouseout=function(){
 95                     auto();
 96                 }
 97             }
 98             prev.onclick=function(){
 99                 clearInterval(timer);
100                 index--;
101                 if(index<=0){
102                     index=list.length-1;
103                 }
104                 Change(index);
105             }
106             next.onclick=function(){
107                 clearInterval(timer);
108                 index++;
109                 if(index>=list.length){
110                     index=0;
111                 }
112                 Change(index);
113             }
114             prev.onmousemove=function(){
115                 clearInterval(timer);
116             }
117             prev.onmouseout=function(){
118                 auto();
119             }
120             next.onmouseover=function(){
121                 clearInterval(timer);
122             }
123             next.onmouseout=function(){
124                 auto();
125             }
126 
127             function Change(curIndex){
128                         for(var i=0;i<list.length;i++){
129                             list[i].className="";
130                            pic[i].className="hidden";
131                         }
132                         list[curIndex].className="on";
133                         pic[curIndex].className="show";
134                 index=curIndex;
135             }
136             function auto(){
137                 timer=setInterval(function(){
138                     index++;
139                     if(index>=list.length){
140                         index=0
141                     }
142                     Change(index);
143                 },2000);
144             }
145         }
146     </script>
147 </head>
148 <body>
149 <div class="wrap" id="wrap">
150     <ul id="pic">
151         <li class="show"><a href="#"><img src="http://img.mukewang.com/54111cd9000174cd04900170.jpg" alt=""/></a></li>
152         <li><a href="#"><img src="http://img.mukewang.com/54111dac000118af04900170.jpg" alt=""/></a></li>
153         <li><a href="#"><img src="http://img.mukewang.com/54111d9c0001998204900170.jpg" alt=""/></a></li>
154         <li><a href="#"><img src="http://img.mukewang.com/54111d8a0001f41704900170.jpg" alt=""/></a></li>
155         <li><a href="#"><img src="http://img.mukewang.com/54111d7d00018ba604900170.jpg" alt=""/></a></li>
156     </ul>
157     <ul id="list">
158         <li class="on"></li>
159         <li></li>
160         <li></li>
161         <li></li>
162         <li></li>
163     </ul>
164     <a href="javascript:;" class="Prev" id="Prev">&lt;</a>
165     <a href="javascript:;" class="Next" id="Next">&gt;</a>
166 </div>
167 </body>
168 </html>

2）也可以通过控制Pic的margin-Left

1  function Change(curIndex){
2                 for(var i=0;i<list.length;i++){
3                     list[i].className="";
4                 }
5                 list[curIndex].className="on";
6                 Pic.style.marginLeft=-490*curIndex+'px';
7                 index=curIndex;
8             }