item上下自动循环滚动显示

 //li 上下滚动
 (function($){
     $.fn.extend({
         Scroll:function(opt,callback){
                 //参数初始化
                 if(!opt) var opt={};
                 var _btnUp = $("#"+ opt.up);//Shawphy:向上按钮
                 var _btnDown = $("#"+ opt.down);//Shawphy:向下按钮
                 var timerID;
                 var _this=this.eq(0).find("ul:first");
                 var     lineH=_this.find("li:first").height(), //获取行高
                         line=opt.line?parseInt(opt.line,10):parseInt(this.height()/lineH,10), //每次滚动的行数，默认为一屏，即父容器高度
                         speed=opt.speed?parseInt(opt.speed,10):5000; //卷动速度，数值越大，速度越慢（毫秒）
                         timer=opt.timer //?parseInt(opt.timer,10):3000; //滚动的时间间隔（毫秒）
                 if(line==0) line=1;
                 var upHeight=0-line*lineH;
                 //滚动函数
                 var scrollUp=function(){
                         _btnUp.unbind("click",scrollUp); //Shawphy:取消向上按钮的函数绑定
                         _this.animate({
                                 paddingTop:upHeight
                         },speed,function(){
                                 for(i=1;i<=line;i++){
                                         _this.find("li:first").appendTo(_this);
                                 }
                                 console.info(_this.find("li:first"))
                                 _this.css({marginTop:0});
                                 _btnUp.bind("click",scrollUp); //Shawphy:绑定向上按钮的点击事件
                         });

                 }
                 //Shawphy:向下翻页函数
                 var scrollDown=function(){
                         _btnDown.unbind("click",scrollDown);
                         for(i=1;i<=line;i++){
                                 _this.find("li:last").show().prependTo(_this);
                         }
                         _this.css({marginTop:upHeight});
                         _this.animate({
                                 marginTop:0
                         },speed,function(){
                                 _btnDown.bind("click",scrollDown);
                         });
                 }
                //Shawphy:自动播放
                 var autoPlay = function(){
                         if(timer)timerID = window.setInterval(scrollUp,timer);
                 };
                 var autoStop = function(){
                         if(timer)window.clearInterval(timerID);
                 };
                  //鼠标事件绑定
                 _this.hover(autoStop,autoPlay).mouseout();
                 _btnUp.css("cursor","pointer").click( scrollUp ).hover(autoStop,autoPlay);//Shawphy:向上向下鼠标事件绑定
                 _btnDown.css("cursor","pointer").click( scrollDown ).hover(autoStop,autoPlay);

         }
     })
 })(jQuery);

$("#leaderboardList").Scroll({line:1,speed:3000,timer:3000});

 <div id="leaderboardList">
     <ul id="leaderboardList_item">
         <!-- <li>
             <span class="name">名字名字名字1</span>
             <span class="good_name">产品</span>
         </li> -->
     </ul>
 </div>