<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
#d1{
width:100px;
height:30px;
background:red;
text-align:center;
line-height:30px;
color:#fff;
float:right;
/*相对定位：配合#menu做绝对定位*/
position:relative;
}
#menu{
width:300px;
height:150px;
background:red;
/*绝对定位*/
position:absolute;
right:0px;
top:30px;
display:none;/*隐藏*/
}
#d1:hover #menu{
display:block;/*显示*/
}
</style>
</head>
<body>
<div id="d1">
果园公告
<div id="menu">
果园公告弹出菜单
</div>
</div>
</body>
</html>
