TA贡献53条经验 获得超69个赞
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TA贡献31条经验 获得超3个赞
伪类,为某个元素前后添加内容
TA贡献119条经验 获得超250个赞
http://www.imooc.com/code/4409《十天精通CSS3》课程里有详细的介绍^_^
TA贡献59条经验 获得超36个赞
伪类,就是before、after。也就是前和后加一个类
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