当鼠标移出灰色区域时候,菜单项怎么隐藏起来

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>无标题文档</title> <script language="javascript"> var $=function(id){     return document.getElementById(id); } function hover(){     if($('hover').style.display == 'none'){         $('hover').style.display = '';         }else{     $('hover').style.display = 'none';     } } </script> <style> *{margin:10px; padding:0} #nav{border:#ccc 1px solid; height:25px; width:198px; text-align:center; line-height:25px; margin-bottom:0} #hover{ position:absolute; height:100px; width:200px; margin-top:-2px; text-align:center; background-color:#ccc; } </style> </head> <body> <div id="nav" onmouseover="return hover();"  onmouseout="return hover();"><a href="##" >鼠标移上来</a></div> <div id="hover" style="display:none;"  onmouseover="return hover();"  onmouseout="return hover();">   <ul>     <li><a href="javascript:void(null)">菜单一</a></li>     <li> <a href="javascript:void(null)">菜单二</a></li>   </ul> </div> </body> </html>

[Ctrl+A 全选注:引入外部Js需再刷新一下页面才能执行]

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当鼠标移出灰色区域时候,菜单项怎么隐藏起来

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