CSS 変換 3D スライド効果

[javascript]
$(function(){ 
    var length = $(".container a").length; 
    var $items = $(".container a"); 
 
    $items.on("transitionend", function(event){ 
        $items.removeClass("trans"); 
    }); 
 
    $(".container a").each(function(index, value){ 
        var $child = $(this); 
        if (index === 0) { 
            $child.addClass("current showing"); 
        } else if (index === 1) { 
            $child.addClass("left showing"); 
        } else if (index == 2) { 
            $child.addClass("out-left"); 
        } else if (index == (length - 2)) { 
            $child.addClass("out-right"); 
        } else if (index === (length - 1)) { 
            $child.addClass("right showing"); 
        } else { 
            $child.addClass("hiding"); 
        };

        $child.click(function(){ 
            var $item = $(this); 
            //next item   
            var $nextItem = (index === (length - 1)) ?  $items.eq(0) : $items.eq(index + 1); 
            //previous item  
            var $preItem = (index === 0) ? $items.eq(length - 1) : $items.eq(index - 1); 
            var $rightItem; 
            if(index == 0){ 
                $rightItem = $items.eq(length - 2); 
            } else if (index == 1) { 
                $rightItem = $items.eq(length - 1); 
            } else { 
                $rightItem = $items.eq(index - 2); 
            } 
            var $leftItem; 
            if(index == length - 2){ 
                $leftItem = $items.eq(0); 
            } else if (index == length - 1) { 
                $leftItem = $items.eq(1); 
            } else { 
                $leftItem = $items.eq(index + 2); 
            }

            //current item click,return  
            if ($item.hasClass("current")) { 
                return false; 
            } else if ($item.hasClass("left")) { 
                //center move right  
                $preItem.attr("class","trans right showing"); 
                //left move center  
                $item.attr("class","trans current showing"); 
                //right item move out  
                $rightItem.attr("class","trans out-right"); 
                //next move left  
                $nextItem.attr("class","trans left showing"); 
                //left ready  
                $leftItem.attr("class","out-left"); 
            } else if ($item.hasClass("right")) { 
                //center move left  
                $nextItem.attr("class","trans left showing"); 
                //right move center  
                $item.attr("class","trans current showing"); 
                //left item clear  
                $leftItem.attr("class","trans out-left"); 
                //previous move right  
                $preItem.attr("class","trans right showing"); 
                //right ready  
                $rightItem.attr("class","out-right"); 
            }; 
        }); 
    }); 
});

$(function(){
 var length = $(".container a").length;
 var $items = $(".container a");

 $items.on("transitionend", function(event){
  $items.removeClass("trans");
 });

 $(".container a").each(function(index, value){
  var $child = $(this);
  if (index === 0) {
   $child.addClass("current showing");
  } else if (index === 1) {
   $child.addClass("left showing");
  } else if (index == 2) {
   $child.addClass("out-left");
  } else if (index == (length - 2)) {
   $child.addClass("out-right");
  } else if (index === (length - 1)) {
   $child.addClass("right showing");
  } else {
   $child.addClass("hiding");
  };

  $child.click(function(){
   var $item = $(this);
   //next item
   var $nextItem = (index === (length - 1)) ?  $items.eq(0) : $items.eq(index + 1);
   //previous item
   var $preItem = (index === 0) ? $items.eq(length - 1) : $items.eq(index - 1);
   var $rightItem;
   if(index == 0){
    $rightItem = $items.eq(length - 2);
   } else if (index == 1) {
    $rightItem = $items.eq(length - 1);
   } else {
    $rightItem = $items.eq(index - 2);
   }
   var $leftItem;
   if(index == length - 2){
    $leftItem = $items.eq(0);
   } else if (index == length - 1) {
    $leftItem = $items.eq(1);
   } else {
    $leftItem = $items.eq(index + 2);
   }

   //current item click,return
   if ($item.hasClass("current")) {
    return false;
   } else if ($item.hasClass("left")) {
    //center move right
    $preItem.attr("class","trans right showing");
    //left move center
    $item.attr("class","trans current showing");
    //right item move out
    $rightItem.attr("class","trans out-right");
    //next move left
    $nextItem.attr("class","trans left showing");
    //left ready
    $leftItem.attr("class","out-left");
   } else if ($item.hasClass("right")) {
    //center move left
    $nextItem.attr("class","trans left showing");
    //right move center
    $item.attr("class","trans current showing");
    //left item clear
    $leftItem.attr("class","trans out-left");
    //previous move right
    $preItem.attr("class","trans right showing");
    //right ready
    $rightItem.attr("class","out-right");
   };
  });
 });
});