CSS3新增伪类 徐同保 2021-06-24 174 阅读1分钟 CSS3新增伪类 举例：\ p:first-of-type\ p:last-of-type \ p:only-of-type \ p:only-child \ p:nth-child(2) :after\ :before :not()\ \ \ \ \ \ \ \ \ \ \
