JQuery无缝滚动

$(function(){   $("ul li:lt(5)").clone().appendTo("ul");   var $width = $("ul li:lt(5)").width() * 4;   var currIndex = 0;   $("#next").click(function(){      if(currIndex == 2){         currIndex = 0;         $("ul").css("left",0);      }      currIndex++;      $("ul").stop().animate({left:$width * currIndex * -1},500);   });   $("#prev").click(function(){      if(currIndex == 0){         currIndex = 2;         $("ul").css("left",2 * $width * -1);      }      currIndex--;      $("ul").stop().animate({left:$width * currIndex * -1},500);   });   $("ul>li").hover(function(){      $(this).children().eq(1).stop().animate({top:0},400);   },function(){      $(this).children().eq(1).stop().animate({top:240},400);   });});