HTML 显示隐藏
<div id="xuanxiang" class="yincang" onMouseOver="this.className='xianshi'" onMouseOut="this.className='yincang'">
<h1>主页</h1>
<div id="neirong">内容1<br>内容2<br></div>
</div>
<div id="xuanxiang" class="yincang" onMouseOver="this.className='xianshi'" onMouseOut="this.className='yincang'">
<h1>主页</h1>
<div id="neirong">内容1<br>内容2<br></div>
</div>