问寻找特定类型的jQuery内容滑块

EN

var $sl = $('#slider');
var slW = $sl.outerWidth(true);
var slN = $sl.children().length;
var c = 0;
var W = slW/slN;
$('#scroller, #nav_btns li').width(W);


function move(){
  c = c==-1 ? slN-1 : c%slN;
  $sl.stop().animate({scrollLeft: slW*c},1000);
  $('#scroller').stop().animate({left: W*c},500);
}

$('#prev, #next').click(function(e){
  var btn = this.id==='next'?c++:c--;
  move();
});

$('#nav_btns li').click(function(){
  c= $(this).index();
  move();
});

$("#scroller").draggable({
    containment:'parent',
    stop: function(){
        var stopPos = $(this).position().left;
        c = (Math.abs(stopPos/W).toFixed(0));
        move();
    }
});