css3 代边框的小三角怎么做
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你好，我这里用CSS实现了三种带边框三角，效果分别如图：
实例代码如下，根据你个人的情况调整代码吧：
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Arrow</title>
</head>
<body>
<style>
/* scale */
.arrow,
.arrow:after
position: relative;
display: inline-block;
width: 0;
height: 0;
border-top: 0;
border-left: 30px dotted transparent;
border-right: 30px dotted transparent;
border-bottom: 30px dashed #000;
.arrow:after
position: absolute;
top: 0;
content: '';
transform: translateX(-50%) scale(.8);
border-bottom: 30px dashed #fff;
/* width & height */
.arrow1,
.arrow1:after
position: relative;
display: inline-block;
width: 0;
height: 0;
border-top: 0;
border-left: 30px dotted transparent;
border-right: 30px dotted transparent;
border-bottom: 30px dashed #000;
.arrow1:after
position: absolute;
left: -26px;
top: 2px;
content: '';
width: 0;
height: 0;
border-top: 0;
border-left: 26px dotted transparent;
border-right: 26px dotted transparent;
border-bottom: 26px dashed #fff;
/* border & after */
.arrow2
position: relative;
display: inline-block;
width: 28px;
height: 28px;
border: 0;
border-top: 2px solid #000;
border-right: 2px solid #000;
-webkit-transform: translate(7px, 14px) rotate(-45deg);
-ms-transform: translate(7px, 14px) rotate(-45deg);
-o-transform: translate(7px, 14px) rotate(-45deg);
transform: translate(7px, 14px) rotate(-45deg);
.arrow2:after
position: absolute;
left: 0;
top: -2px;
width: 42px;
height: 2px;
content: '';
border-radius: 2px;
background-color: #000;
-webkit-transform-origin: left top;
-moz-transform-origin: left top;
-ms-transform-origin: left top;
-o-transform-origin: left top;
transform-origin: left top;
-webkit-transform: rotate(45deg);
-ms-transform: rotate(45deg);
-o-transform: rotate(45deg);
transform: rotate(45deg);
</style>
<span class="arrow"></span>
<span class="arrow1"></span>
<span class="arrow2"></span>
</body>
</html>
希望能帮到你，如有疑问请追问，望采纳~
参考技术A <!DOCTYPE html><html>
<head>
<style type='text/css'>
/* 上三角 */
.arrow-up
width: 0;
height: 0;
border-left: 20px solid transparent;
border-right: 20px solid transparent;
border-bottom: 20px solid green;
/* 下三角 */
.arrow-down
width: 0;
height: 0;
border-left: 20px solid transparent;
border-right: 20px solid transparent;
border-top: 20px solid orange;
/* 右三角 */
.arrow-right
width: 0;
height: 0;
border-top: 60px solid transparent;
border-bottom: 60px solid transparent;
border-left: 60px solid blue;
/* 左三角 */
.arrow-left
width: 0;
height: 0;
border-top: 10px solid transparent;
border-bottom: 10px solid transparent;
border-right: 10px solid silver;
</style>
</head>
<body>
<div class="arrow-up"></div>
<div class="arrow-down"></div>
<div class="arrow-left"></div>
<div class="arrow-right"></div>
</body>
</html> 参考技术B 其实用bootstrap插件很好做，它自己里面就有这些功能
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