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你知道的伪类有哪些？说明它们的用法 #20

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ray-sh opened this issue Nov 3, 2019 · 0 comments
Open

你知道的伪类有哪些？说明它们的用法 #20

ray-sh opened this issue Nov 3, 2019 · 0 comments

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@ray-sh
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ray-sh commented Nov 3, 2019 •
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:first-child的作用是匹配某父元素的第一个子元素
:last-child的作用是匹配某父元素的最后一个子元素
:first-of-type的作用是匹配父元素下使用同种标签的第一个子元素
:last-of-type的作用是匹配父元素下使用同一种标签的最后一个子元素
:link的作用是选中未访问的链接
:hover的作用是选中鼠标放置上的链接
:active的作用是选中鼠标按下未松开时的链接
:visited的作用是选中访问过的链接
:checked选中被勾选的表单元素
:disabled选中被禁用的表单元素
:focus选中被激活的表单元素
:root选中根节点
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