css 圆角切换（CSS实现反方向圆角的示例代码）

<li class="wrapper-dashed">
    <li class="dashed"></li>
</li>

.wrapper-dashed{
    position: relative;
    height: 1px;
    width: 100%;
}
/*虚线实现*/
.dashed {
    border-top: 1px dashed #cccccc;
    height: 1px;
    overflow: hidden;
}
.dashed:before, .dashed:after{
    display: block;
    position: absolute;
    content: "";
    width:10px;
    height:10px;
    background-color:#f3f5f9;
    border-radius:50%;
    top: -5px;
}
.dashed:before{
    left: -5px;
}
.dashed:after{
    right: -5px;
}