css 箭头

来源：互联网发布：其他设备网络控制器编辑：程序博客网时间：2024/05/08 13:41

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script type="text/javascript" src="jquery.js"></script>
<style type="text/css">
body{
background:green;
}
/*导航菜单*/
.block_nav{
   position:relative;
   top:100px;
   width:200px;
   height:100px;
   background:navy;

}

.sl1,.sl2 {
   display: block;
   height: 0px;
   width: 0px;
   position: absolute;
   font-size: 0;
   line-height:0;
}

.sl1{
   top:60%;
   right: -20px; /* 它来确定尖角的位置 */
   border-right: 10px solid transparent;
   border-left: 10px solid navy; /* 注意颜色的变化 */
   border-top: 10px solid transparent;
   border-bottom: 10px solid transparent;
}

.sl2{
   right:-10px; /* 是自身边框宽度的2倍 */
   top: -5px; /* 是自身边框宽度的-1倍 */
   border-right: 10px solid transparent;
   border-left: 10px solid navy;
   border-top: 5px solid transparent;
   border-bottom: 5px solid transparent;
}
</style>
<script type="text/javascript">

</script>
</head>
<body>

   <div class="block_nav ">
   <span class="sl1"><span class="sl2"></span></span>

   </div>
</body>
</html>