第一种
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>如何利用边框绘制三角形</title>
<style type="text/css">
.box {
width: 0px;
height: 0px;
border-top: 50px solid transparent;
border-bottom: 50px solid blue;
border-left: 50px solid transparent;
border-right: 50px solid transparent;
}
</style>
</head>
<body>
<div class="box"></div>
</body>
</html>
第二种
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>如何利用边框绘制三角形</title>
<style type="text/css">
.box {
width: 0;
height: 0;
border: 50px solid transparent;
border-bottom: 50px solid blue;
}
</style>
</head>
<body>
<div class="box"></div>
</body>
</html>
练习项目 -- 原视频 https://www.bilibili.com/video/BV17x4y137g7?p=1&vd_source=55321cad1757f1bb77533a9972c8cd31
