纯css实现菜单激活状态切换_html/css_WEB-ITnose
纯css实现菜单激活状态切换，当鼠标悬停菜单项时，原本激活状态的项变为普通状态，而鼠标悬停的项变为激活状态先看一个[例子](http://runjs.cn/detail/q3qcxwgw)核心代码：```.menu:hover>li.active>a{/*当鼠标悬停到整个菜单时，原本的激活项变为普通项*/ color:#f0f0f0; background-color:transparent;}.menu>li.active>a,/*这个是菜单项原本的激活项*/.menu:hover>li:hover>a{/*当鼠标悬停到菜单项时，变为激活状态*/ color:#232323; background-color:#f0f0f0;}```要点：1. 菜单项的父元素应恰好包含菜单项，不能出现空白。例如上述例子中，ul刚好容纳所有的li，ul的宽正好等于所有li的宽的总和。2. 利用了.menu>li.active>a被.menu:hover>li.active>a覆盖，.menu:hover>li.active>a被.menu:hover>li:hover>a覆盖的原理
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