JS realizes the switching effect of Chinese and English in navigation bar

Ideas:

The height of ul is half of li, ul{overflow:hidden}

li:hover{margin-top:-40px;}

&lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http:///TR/xhtml1/DTD/"&gt;
&lt;html xmlns="http:///1999/xhtml"&gt;
&lt;head&gt;
&lt;meta http-equiv="Content-Type" content="text/html; charset=utf-8" /&gt;
&lt;title&gt;Chinese-English switching navigation bar&lt;/title&gt;
&lt;style type="text/css"&gt;
*{padding:0; margin:0;}
li{ list-style:none; }
a{ text-decoration:none;}
.nav{ width:100%; height:40px; background:#222; margin-top:100px; overflow:hidden;}
.list{ width:1000px; height:40px; margin:0 auto;}
.list li{ float:left;}
.list li a{ display:block; transition:0.3s;}
.list b,.list i{ display:block; padding:0 30px; color:#aaa; line-height:40px; text-align:center;}
.list b{ font-weight:100}
.list i{ font-style:normal; background:#333; color:#fff;}
.list a:hover{ margin-top:-40px;}
&lt;/style&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;div class="nav"&gt;
 &lt;ul class="list"&gt;
 &lt;li&gt;
  &lt;a href="#"&gt;
  &lt;b&gt;Index&lt;/b&gt;
  &lt;i&gt;front page&lt;/i&gt;
  &lt;/a&gt;
 &lt;/li&gt;
 &lt;li&gt;
  &lt;a href="#"&gt;
  &lt;b&gt;course&lt;/b&gt;
  &lt;i&gt;Vocational courses&lt;/i&gt;
  &lt;/a&gt;
 &lt;/li&gt;
 &lt;li&gt;
  &lt;a href="#"&gt;
  &lt;b&gt;study&lt;/b&gt;
  &lt;i&gt;Employment study&lt;/i&gt;
  &lt;/a&gt;
 &lt;/li&gt;
 &lt;li&gt;
  &lt;a href="#"&gt;
  &lt;b&gt;BBS&lt;/b&gt;
  &lt;i&gt;Community&lt;/i&gt;
  &lt;/a&gt;
 &lt;/li&gt;
 &lt;li&gt;
  &lt;a href="#"&gt;
  &lt;b&gt;JiKe+&lt;/b&gt;
  &lt;i&gt;Discover+&lt;/i&gt;
  &lt;/a&gt;
 &lt;/li&gt;
 &lt;/ul&gt;
&lt;/div&gt;
&lt;/body&gt;
&lt;/html&gt;

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