为 CSS 三角形添加边框
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/29001636/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
提示：将鼠标放在中文语句上可以显示对应的英文。显示中英文
时间：2020-08-30 03:03:46 来源:igfitidea点击:
Adding border to CSS triangle
提问by propster
I have a triangle
我有一个三角形
<div class="triangle-left"></div>
.triangle-left {
width: 0;
height: 0;
border-top: 22px solid transparent;
border-bottom: 22px solid transparent;
border-right: 22px solid white;
}
How do I draw the outline of a CSS triangle, considering borderitself is used to make the triangle? External divs?
考虑到border自己是用来制作三角形的，我该如何绘制 CSS 三角形的轮廓？外部div？
回答by RSquared
One way to do it is the create an inner triangle which is smaller.
一种方法是创建一个较小的内部三角形。
.triangle-left {
width: 0;
height: 0;
border-top: 23px solid transparent;
border-bottom: 23px solid transparent;
border-right: 23px solid red;
}
.inner-triangle {
position: relative;
top: -20px;
left: 2px;
width: 0;
height: 0;
border-top: 20px solid transparent;
border-bottom: 20px solid transparent;
border-right: 20px solid blue;
}<div class="triangle-left">
<div class="inner-triangle"></div>
</div>回答by joncampbell
This is how I would do it.
这就是我要做的。
.triangle-left {
width: 0;
height: 0;
border-top: 22px solid transparent;
border-bottom: 22px solid transparent;
border-right: 22px solid black;
position: relative;
}
.triangle-left:after {
content: '';
width: 0;
height: 0;
border-top: 21px solid transparent;
border-bottom: 21px solid transparent;
border-right: 21px solid #dddddd;
position: absolute;
top: -21px;
left: 1px;
}<div class="triangle-left"></div>Here it is on JSFiddle.
这是在JSFiddle 上。
