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<!DOCTYLE html><html><head><meta charset="utf-8"><title>绝对定位...
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<html><head><link rel="stylesheet" href="http://www.php.cn/static/layu...
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<!DOCTYLE html><html><head><meta charset="utf-8"><title>那就做个...
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一、实现功能当鼠标在导航条上移动时，下划线跟着移动，背景色和字体颜色改变，鼠标移出导航条时，下划线回到原位。二、功能代码<!DOCTYPE html> <html ...
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