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<>css伪元素选择器before 和 after 的使用
前言:最近收集了一些关于before 和 after 的使用，汇总了一下，不全面，但是，希望便于以后自己查看。
:before 的作用:在子元素的最前面, 添加一个伪元素, 伪元素内容通过 content
控制,可以在content属性中写入文本内容，但是通常为空字符串。
:after 的作用: 在子元素的最后面, 添加一个伪元素, 伪元素内容通过 content
控制,可以在content属性中写入文本内容，但是通常为空字符串。
before 和 after 使用注意点:
1. 必须设置 content
2. 默认是行内元素
如果要设置大小, 需要转换显示模式
display: block/inline-block;
或者定位position: absolute/fixed;
3. before 和 after 都是伪元素, 不是真实存在的元素, 不能添加 hover,
且 不能通过 js 进行获取
before 和 after 的使用场景:
1. 清除浮动
2. 添加遮罩层 或者 添加小图标
<>1.清除浮动
.clearfix:after { content: ""; display: block; /* 清除浮动元素造成的影响 */ clear: both;
height: 0; line-height: 0; visibility: hidden; }
<>2.添加小图标
css代码
<style> * { padding: 0; margin: 0; box-sizing: border-box; } ul { width:
400px; height: 50px; border: 1px solid #000; margin: 150px auto ; text-align:
center; } ul li { width: 25% ; height: 50px; list-style: none ; border: 1px
solid #000; text-decoration: none ; float: left; line-height: 50px; position:
relative; } .new:before { content: '' ; width: 36px; height: 23px; position:
absolute ; top:0px ; right: 0px; background-image: url('./images/icon.png'); }
</style>
效果
