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还是很谢谢楼上的大哥,我是小菜鸟,太多东西不懂了

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<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>
<style type="text/css">
*{ padding:0; margin:0;}
#one{width:350px; height:20px; background:#eee;}
#two{width:347px; height:312px; display:none; border-left:none; border:#235FA5 solid 3px;}
#one_three{ width:80px; height:20px; margin:auto;}
select,option,#one{cursor:pointer;}
</style>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function(){
$("#one_three").hover(function () {
$("#two").show(function () {
$(this).mouseleave(function (e) {
var o = e.relatedTarget || e.toElement;
if (!o) return; //增加移动到的对象判断,为option时退出
$(this).hide();
});
});
});
});
</script>
</head>
<body>
<div id="big">
<div id="one" >
<div id="one_three">AAAAAAAA</div>
</div>
<div id="two">
<ul>
<li><a href="#">sdfsdfs</a></li>
<li><a href="#">sdfsdfs</a></li>
<li><a href="#">sdfsdfs</a></li>
</ul>
<select id="ccc">
<option><a href="#">WW2WWWW</a></option>
<option><a href="#">WW3WWWW</a></option>
<option><a href="#">WW4WWWW</a></option>
<option><a href="#">WW5WWWW</a></option>
</select>
</div>
</div>
</body>
</html>