截图：
源码：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>用户界面</title>
<style>
.dropdown{
position: relative;;
display: inline-block;
float:left;
}
.dropdown-content{
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
}
.dropdown-content a{
color: #000000;
padding: 12px 16px;
text-decoration: none;
display: block;
}
.dropdown-content a:hover{background-color: #f1f1f1}
.dropdown:hover .dropdown-content{
display: block;
}
.dropdown:hover .dropbtn{
background-color: #3e8e41;
}
</style>
</head>
<body>
<div class="container">
<!-- 头部 -->
<div class="head">
<div class="dropdown">
<button class="dropbtn"><img src="img/touxiang.jpg" style="height:45px;float:left;"></button>
<div class="dropdown-content">
<a href="blog/index.jsp">我的博客</a>
<a href = "javascript:void(0)" onclick = "document.getElementById('light').style.display='block';document.getElementById('fade').style.display='block'">
添加好友
</a>
<a href="basic/Perfectinformation.jsp">完善个人信息</a>
<a href="">充值会员</a>
<a href="">查看所有用户</a>
<a href="loginOut">注销退出</a>
</div>
</div>
</body>
</html>
