解决1px边框显示模糊的问题
.slidebar folder li{
padding:8px 0 8px 15px;
position:relative;
}
folder li + li:before{
position:absolute;
top:-1px;
left:0;
content:'';
width:100%;
height:1px;
border-top:1px solid #ddd;
-webkit-transform:scaleY(0.5);//缩放0.5
}