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原生js获取css伪类元素并设置属性


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改编自

一、伪元素有哪些

首先,我们简单说一下伪元素。有六个伪元素,分别是:after,before,一线,首字母,selection, background。

各大网页中最常用的伪元素是:after和:before。

关于这些伪元素的语义,请参考另一篇文章《CSS伪元素选择器 总结》。

在CSS3中,建议伪元素使用两个冒号(:3360)语法,而不是一个冒号(

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