深入理解border以及应用
深入border属性以及应用👏👏
border这个属性在开发过程中很常用，常常用它来作为边界的。但是大家真的了解border吗？以及它的形状是什么样子的。
我们先来看这样一段代码：👏
<!--* @Author: syk 185901261@qq.com* @Date: 2023-02-28 21:07:48* @LastEditors: syk 185901261@qq.com* @LastEditTime: 2023-02-28 21:08:01* @FilePath: \css面试题\13.drawTriangle\1.html* @Description: * * Copyright (c) 2023 by ${git_name_email}, All Rights Reserved.
-->
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title><style>.box{width: 200px;height: 200px;border: 3px solid red;border-color: red green yellow seashell;}</style>
</head>
<body><div class="box"></div>
</body>
</html>
它的效果图如下：
放大看，可以看到，每个border实际上是由一个高作为width的题型来构成的。整个盒子的宽度就为内部矩形宽度加上边框宽度(两个梯形的高度)。那么，如果==我们将中间矩形的宽度设为0==，又会发生什么呢？👏
效果如图所示:
那么利用这个特点，我们就可以利用border的特性来画出各个图形。👏
画三角形👏
<!--* @Author: syk 185901261@qq.com* @Date: 2023-02-28 21:07:48* @LastEditors: syk 185901261@qq.com* @LastEditTime: 2023-02-28 21:31:54* @FilePath: \css面试题\13.drawTriangle\1.html* @Description: * * Copyright (c) 2023 by ${git_name_email}, All Rights Reserved.
-->
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title><style>*{margin: 0;padding: 0;}.box{width: 0;height: 0;border-top: 200px solid rebeccapurple;border-left: 200px solid royalblue;border-right: 200px solid rosybrown;}.box1{width: 0;height: 0;border-top: 200px solid skyblue;border-right: 200px solid transparent;}</style>
</head>
<body><div class="box"></div><div class="box1"></div>
</body>
</html>
效果图如下：
这里有一点，如果border只有两个边的话—左右哪里有空钻哪里(哪边没有写border钻到哪里)，则会形成对三角形！！！
画扇形👏
先看如下代码：
<!--* @Author: syk 185901261@qq.com* @Date: 2023-02-28 21:41:15* @LastEditors: syk 185901261@qq.com* @LastEditTime: 2023-02-28 21:43:54* @FilePath: \css面试题\14.drawSector\1.html* @Description: * * Copyright (c) 2023 by ${git_name_email}, All Rights Reserved.
-->
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title><style>.box1{width: 100px;height: 100px;border-radius: 10px;background-color: pink;border: 10px solid red;border-color: red seashell aqua palevioletred;}</style>
</head>
<body><div class="box1"></div>
</body>
</html>
border-radius似乎就是把原本梯形的那部分换算成了扇形。依据这个原理，我们就可以做出扇形了。
第一步：从矩形变成圆形
<!--* @Author: syk 185901261@qq.com* @Date: 2023-02-28 21:41:15* @LastEditors: syk 185901261@qq.com* @LastEditTime: 2023-02-28 21:48:12* @FilePath: \css面试题\14.drawSector\1.html* @Description: * * Copyright (c) 2023 by ${git_name_email}, All Rights Reserved.
-->
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title><style>.box1{width: 0;height: 0;border-radius: 10px;background-color: pink;border: 10px solid red;border-color: red seashell aqua palevioletred;}</style>
</head>
<body><div class="box1"></div>
</body>
</html>
第二步：扇形–隐藏边框
<!--* @Author: syk 185901261@qq.com* @Date: 2023-02-28 21:41:15* @LastEditors: syk 185901261@qq.com* @LastEditTime: 2023-02-28 21:51:10* @FilePath: \css面试题\14.drawSector\1.html* @Description: * * Copyright (c) 2023 by ${git_name_email}, All Rights Reserved.
-->
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title><style>.box1{width: 0;height: 0;border-radius: 10px;border: 10px solid red;border-color: red transparent transparent transparent;}</style>
</head>
<body><div class="box1"></div>
</body>
</html>
画半圆👏
<!--* @Author: syk 185901261@qq.com* @Date: 2023-02-28 21:41:15* @LastEditors: syk 185901261@qq.com* @LastEditTime: 2023-02-28 21:51:10* @FilePath: \css面试题\14.drawSector\1.html* @Description: * * Copyright (c) 2023 by ${git_name_email}, All Rights Reserved.
-->
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title><style>.box2{width: 100px;height: 100px;background-color: seagreen;border-radius: 50%;}</style>
</head>
<body><div class="box2"></div>
</body>
</html>
<!--* @Author: syk 185901261@qq.com* @Date: 2023-02-28 21:41:15* @LastEditors: syk 185901261@qq.com* @LastEditTime: 2023-02-28 21:57:29* @FilePath: \css面试题\14.drawSector\1.html* @Description: * * Copyright (c) 2023 by ${git_name_email}, All Rights Reserved.
-->
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title><style>.box3{background-color: red;width: 100px;height: 50px;border-radius: 0px 0px 100px 100px;}</style>
</head>
<body><div class="box3"></div>
</body>
</html>
到次为止，如果都对这些例子搞懂了，相信你对border属性也有一个更深的理解了。👏👏👏👏