.folder {
/* This will enable the 3D effect. Decrease this value

• to make the perspective more pronounced: */

-webkit-perspective: 800px;
-moz-perspective: 800px;
perspective: 800px; /镜头距离800PX/

position: absolute;
top: 50%;
left: 50%;
z-index: 0;

width: 160px;
height: 120px;
margin: -100px 0 0 -60px;
}

.folder div{
width:150px;
height:115px;

background-color:#93bad8;

/ 3D变化保留元素的位置 /
-webkit-transform-style: preserve-3d;
-moz-transform-style: preserve-3d;
transform-style: preserve-3d;

/平滑的动画过渡 /
-webkit-transition:0.5s;
-moz-transition:0.5s;
transition:0.5s;

/禁止用户选中元素/
-webkit-user-select: none;
-moz-user-select: none;
user-select: none;

position:absolute;
top:0;
left:50%;
margin-left:-75px;
}

.folder .front{

/圆角，X轴3D转换30度 /
border-radius:5px 5px 0 0;
-moz-transform:rotateX(-30deg);
-webkit-transform:rotateX(-30deg);
transform:rotateX(-30deg);

/定义在X轴与Y轴的位置 /
-moz-transform-origin:50% 100%;
-webkit-transform-origin:50% 100%;
transform-origin:50% 100%;

/定义渐变效果 /
background-image: -moz-linear-gradient(top,#93bad8 0%,#6c9dc0 85%,#628faf 100%);
background-image: -webkit-linear-gradient(top,#628faf 100%);
background-image: linear-gradient(top,#628faf 100%);

/定义阴影 /
Box-shadow:0 -2px 2px rgba(0,0.1),0 1px rgba(255,255,0.35) inset;

z-index:10;

font: bold 26px sans-serif;
color: #5A88A9;
text-align: center;
text-shadow: 1px 1px 1px rgba(255,0.1);
line-height: 115px;
}

.folder .back{
/定义渐变效果 /
background-image: -webkit-linear-gradient(top,#89afcc 10%,#5985a5 60%);
background-image: -moz-linear-gradient(top,#5985a5 60%);
background-image: linear-gradient(top,#5985a5 60%);

/定义圆角/
border-radius:0 5px 0 0;
/定义阴影 /
Box-shadow:0 -1px 1px rgba(0,0.15);
}

/在.back前加上内容 /
.folder .back:before{
content:'';
width:60px;
height:10px;
border-radius:4px 4px 0 0;
background-color:#93bad8;
position:absolute;
top:-10px;
left:0px;
Box-shadow:0 -1px 1px rgba(0,0.15);
}

/在.back后加上内容 /
.folder .back:after{
content:'';
width:100%;
height:4px;
border-radius:5px;
position:absolute;
bottom:5px;
left:0px;
Box-shadow:0 4px 8px #333;
}

.folder.open .front{
/3D转换50度 /
-moz-transform:rotateX(-50deg);
-webkit-transform:rotateX(-50deg);
transform:rotateX(-50deg);
}

/----------------------------
Draggable Icons
-----------------------------/

main img{

position:absolute;
cursor:move;
}

img.draggable(); //使所有图片可以拖拽

folder.droppable({ //droppable事件,即拖拽到文件夹时触发的事件
drop : function(event,ui) {//释放时触发

  // 移动拖拽的<a href="https://www.jb51.cc/tag/tupian/" target="_blank" class="keywords">图片</a>
  ui.draggable.remove();

  // 给计数器加1
  front.text(++droppedCount);

},activate : function(){ //拖拽时让<a href="https://www.jb51.cc/tag/wenjian/" target="_blank" class="keywords">文件</a>夹打开

  folder.addClass('open');
},deactivate : function(){ //停止拖拽时让<a href="https://www.jb51.cc/tag/wenjian/" target="_blank" class="keywords">文件</a>夹<a href="https://www.jb51.cc/tag/guanbi/" target="_blank" class="keywords">关闭</a>
  folder.removeClass('open');
}

});
});