before伪类的超有用应用技巧——水平菜单竖线分隔符-优快云博客

2019独角兽企业重金招聘Python工程师标准>>>

方法一、li前面加before伪类

<!doctype html> <html dir="ltr" lang="zh-CN">  <head>  <meta charset="utf-8"/>  <meta http-equiv="X-UA-Compatible" content="IE=Edge">  <title>菜单</title> style type="text/css" title="default" media="screen">  ul { padding:0; margin:0; font:0.9em Verdana; }  li { display:inline; color:green; }  li~li:before { content:"|"; padding-right:5px; color:red; }  li a{ display:block;text-decoration:none;background:#CC99CC;}  li a{ display:inline;} </style>  </head>  <body>  <ul>      <li>menu1</li>      <li><a href="http://www.cnblogs.com/rubylouvre/">menu2</a></li>      <li>menu3</li>     <li>menu4</li>  </ul> </body>  </html>

二、或利用相邻选择符加after伪类

<!doctype html>  <html dir="ltr" lang="zh-CN">  <head> <meta charset="utf-8"/>  <meta http-equiv="X-UA-Compatible" content="IE=Edge">  <title>菜单</title>  <style type="text/css" title="default" media="screen"> ul { padding:0; margin:0; font:0.9em Verdana; } li { display:inline; color:green; } li+li:before { content:"|"; padding-right:5px; color:red; } li a{ display:block;text-decoration:none;background:#CC99CC;} li a{ display:inline;} </style> </head>  <body>  <ul>      <li>menu1</li>      <li><a href="http://www.cnblogs.com/rubylouvre/">menu2</a></li>     <li>menu3</li>      <li>menu4</li> </ul>  </body> </html>

三、或利用相邻选择符加after伪类。

由于IE6不支持，我们可以利用负margin技术变通一下，但还是要多添加一个类……

<!doctype html>  <html dir="ltr" lang="zh-CN"> <head> <meta charset="utf-8"/> <meta http-equiv="X-UA-Compatible" content="IE=Edge">  <title>菜单</title> <style type="text/css" title="default" media="screen"> ul { padding:0; margin:0; font:0.9em Verdana; } li { display:inline; color:green; padding:0 5px;border-right:1px solid red;margin-left:-1px;} li a{ display:block;text-decoration:none;background:#CC99CC;} li a{ display:inline;} li.last {border-width:0;} </style>  </head>  <body>  <ul>      <li>menu1</li>     <li><a href="http://www.cnblogs.com/rubylouvre/">menu2</a></li>     <li>menu3</li>     <li class="last">menu4</li>  </ul> </body> </html>