三角形
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>三角形</title>
<style type="text/css">
body{
background-color: pink;
}
div{
width: 0px;
height: 0px;
border-top: 10px solid blue;
border-right: 10px solid transparent;
border-bottom: 10px solid transparent;
border-left: 10px solid transparent;
/* 唰(忽略不计) */
/* border-width: 10px;
border-style: solid;
border-color: green orange blue pink; */
}
</style>
</head>
<body>
<div>
</div>
</body>
</html>
箭头
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>Document</title>
<style type="text/css">
*{
margin: 0;
padding: 0;
}
#bigBox{
width: 0;
height: 0;
border-top: 200px solid black;
border-right: 200px solid transparent;
border-bottom: 200px solid transparent;
border-left: 200px solid transparent;
}
#smallBox{
width: 0;
height: 0;
border-top: 160px solid white;
border-right: 160px solid transparent;
border-bottom: 160px solid transparent;
border-left: 160px solid transparent;
position: absolute;
left: 40px;
top: 0;
}
</style>
</head>
<body>
<div id="bigBox"></div>
<div id="smallBox"></div>
</body>
</html>
三角形使用案例：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
*{
margin: 0;
padding: 0;
list-style: none;
line-height: 40px;
cursor: pointer;
}
ul{
width: 200px;
margin: 0 auto;
border: 1px solid #000;
}
h3{
text-indent: 1em;
background-color: dodgerblue;
position: relative;
}
h3:before{
content: "";
width: 0;
height: 0;
border-top: 8px solid transparent;
border-right: 8px solid transparent;
border-bottom: 8px solid transparent;
border-left: 8px solid #000;
position: absolute;
left: 5px;
top: 12px;
}
h3.active:before{
border-top: 8px solid #000;
border-left: 8px solid transparent;
left: 0px;
top: 15px;
}
</style>
</head>
<body>
<ul>
<li>
<h3>我的好友</h3>
</li>
<li>
<h3 class="active">企业好友</h3>
</li>
<li>
<h3>黑名单</h3>
</li>
</ul>
</body>
</html>
制作箭头
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>Document</title>
<style type="text/css">
*{
margin: 0;
padding: 0;
}
#bigBox{
width: 0;
height: 0;
border-top: 200px solid black;
border-right: 200px solid transparent;
border-bottom: 200px solid transparent;
border-left: 200px solid transparent;
}
#smallBox{
width: 0;
height: 0;
border-top: 160px solid white;
border-right: 160px solid transparent;
border-bottom: 160px solid transparent;
border-left: 160px solid transparent;
position: absolute;
left: 40px;
top: 0;
}
</style>
</head>
<body>
<div id="bigBox"></div>
<div id="smallBox"></div>
</body>
</html>
实例: 实心箭头上下左右
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>实心箭头上下左右都有哦</title>
</head>
<body>
<style type="text/css">
/* 向上的箭头 */
.arrow-top {
width: 0;
height: 0;
border-left: 10px solid transparent;
border-right: 10px solid transparent;
border-bottom: 10px solid #217AFF;
font-size: 0;
line-height: 0;
}
/* 向右的箭头 */
.arrow-right {
width: 0;
height: 0;
border-left: 10px solid #217AFF;
border-right: 10px solid transparent;
border-bottom: 10px solid transparent;
font-size: 0;
line-height: 0;
}
/* 向下的箭头 */
.arrow-bottom {
width: 0;
height: 0;
border-left: 4px solid transparent;
/* 左边框的宽 */
border-right: 4px solid transparent;
/* 右边框的宽 */
border-top: 7px solid #217AFF;
/* 下边框的长度|高,以及背景色 */
font-size: 0;
line-height: 0;
}
/* 向左的箭头 */
.arrow-left {
width: 0;
height: 0;
border-left: 10px solid transparent;
border-right: 10px solid #217AFF;
border-bottom: 10px solid transparent;
font-size: 0;
line-height: 0;
}
</style>
</head>
<body>
<div class="arrow"> <span class="arrow-top"></span> <span class="arrow-right"></span> <span class="arrow-bottom"></span>
<span class="arrow-left"></span> </div>
</body>
</html>
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