jquery实现图片滚动效果的简单实例

   <div class="aa">
       <ul>
           <li>
               <a href="#"><img alt="" src=" images/1.jpg"/>
               </a>
           </li>
           <li >
               <a href="#"><img alt="" src="images/2.png">
               </a>
           </li>
           <li>
               <a href="#"><img alt=""  src="images/3.jpg">
               </a>
           </li>
           <li>
               <a href=""><img alt="" src="images/4.jpg">
               </a>
           </li>
           <li>
               <a href="#"><img alt="" src="images/5.jpg">
               </a>
           </li>
       </ul>
   </div>
   <script type="text/javascript">
       jQuery.fn.extend({
           pic_scroll:function (){
               $(this).each(function(){
                   var _this=$(this);//存储对象
                   var ul=_this.find("ul");//获取ul对象
                   var li=ul.find("li");//获取所有图片所有的li
                   var w=li.size()*li.width();//统计图片的长度
                   li.clone().prependTo(ul);//克隆图片一份放入ul里
                   ul.width(2*w);//设置ul的长度，使所有图片排成一排
                   var i=1,l;
                   _this.hover(function(){i=0},function(){i=1});//鼠标经过时设置i=0达到鼠标经过停止效果
                   setInterval(function(){
                       //定时滚动函数
                       l = _this.scrollLeft();
                       if (l < w) {
                           _this.scrollLeft(l+i);
                       } else {
                           _this.scrollLeft(0);
                       }
                   },20);
               })
           }
       });
       $(document).ready(function(){
           $(".a,.aa").pic_scroll();//多个地方使用
       })
   </script>
   </body>
   </html>