Html
Css
Demo
运行代码
<html> <head> <style type="text/css"> a:link, a:visited { border-style: solid; border-width: 5px; border-color: transparent; } a:hover {border-color: gray;} </style> </head> <body> <a href="#">AAA</a> <a href="#">BBB</a> <a href="#">CCC</a> </body> </html>