纯css3从左显示下划线动画导航菜单 · 前端学习笔记

``` <!doctype html> <html> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> </head> <body> <ul class="a"> <li class="n1"> <a href="#">Navigator A</a> </li> <li class="n2"> <a href="#">Navigator B</a> </li> <li class="n3 selected"> <a href="#">Navigator C</a> </li> <li class="n4"> <a href="#">Navigator D</a> </li> <li class="quebec"> </li> </ul> <style> ul { position: relative; overflow: hidden; padding-left: 0px; } li { list-style: none outside; position: relative; z-index: 1; float: left; padding: 0 0 0 0; margin-right: 10px; } li a { position: relative; width: 100px; color: #333; display: block; margin: 0 0; border-bottom: 5px solid transparent; padding: 10px 0; text-align: center; text-decoration: none; } .selected a { border-bottom: 5px solid #cfd0d0; color: #511d7f; } .quebec { position: absolute; bottom: 0px; left: -100px; z-index: 3; margin: 0; border: 0; width: 5px; height: 5px; padding: 0; overflow: hidden; background: #511d7f; -webkit-transition-property: left, width; -moz-transition-property: left, width; -ms-transition-property: left, width; -o-transition-property: left, width; transition-property: left, width; -webkit-transition-duration: .5s; -moz-transition-duration: .5s; -ms-transition-duration: .5s; -o-transition-duration: .5s; transition-duration: .5s; } .n1:hover~li.quebec { left: 5px; width: 110px; } .n2:hover~li.quebec { left: 115px; width: 110px; } .n3:hover~li.quebec { left: 225px; width: 110px; } .n4:hover~li.quebec { left: 335px; width: 110px; } </style> </body> </html> ```