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$(document).ready(function(){
$(".hmain").hover(function(){
$(this).children("ul").fadeIn("fast");
$(this).children("ul").fadeTo("slow",0.8);
},function(){
$(this).children("ul").fadeOut("fast");
});
});
<!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>菜单</title>
<script type="text/javascript" src="jquery-1.3.2.js"></script>
<script type="text/javascript" src="select.js"></script>
<style type="text/css">
*{padding:0px;margin:0px;}
ul{list-style:none}
a{text-decoration:none;}
.hmain{color:#FFF; background-image: url(images/title.gif); background-repeat: repeat-x; width:150px;}
.hmain a{color:#FFF;}
.hmain ul li a{color:red}
.hmain ul{display:none;}
.hmain ul{background-color:#000;}
.hmain{float:left}
</style>
</head>
<body>
<ul>
<li class="hmain"><a href="#">主菜单一</a>
<ul>
<li><a href="#">second_menu1</a></li>
<li><a href="#">second_menu2</a></li>
<li><a href="#">second_menu3</a></li>
<li><a href="#">second_menu4</a></li>
</ul>
</li>
<li class="hmain"><a href="#">主菜单二</a>
<ul>
<li><a href="#">second_menu5</a></li>
<li><a href="#">second_menu6</a></li>
<li><a href="#">second_menu7</a></li>
<li><a href="#">second_menu8</a></li>
</ul>
</li>
<li class="hmain"><a href="#">主菜单三</a>
<ul>
<li><a href="#">second_menu9</a></li>
<li><a href="#">second_menu10</a></li>
<li><a href="#">second_menu11</a></li>
<li><a href="#">second_menu12</a></li>
</ul>
</li>
</ul>
</body>
</html>
$(document).ready(function(){
function show(){
alert("弹出框就可以执行");
//$(this).children("ul").fadeIn(10);
//$(this).children("ul").fadeTo("slow",0.8);
});
$(".hmain").hover(function(){
t=setTimeout(show,800);
},function(){
clearTimeout(t)
//$(this).children("ul").fadeOut("slow");
});
});