思路：
当屏幕为移动设备时，隐藏导航栏列表项目，显示菜单按钮。给菜单按钮（电脑时隐藏）加入hover 或者checked选择器实现，当hover或者checked的触发时动态修改导航栏列表项目display等其他样式。这样当鼠标单击菜单按钮时就可以动态修改导航栏列表的样式了。（用checked选择器需要在导航栏加一个 checkbox) 展示：
1.pc界面
（提示，我的博客还用了bootstrap样式，自己写的这个导航栏个别样式会被覆盖，导致有些偏差，又稍作了些修改），展示的代码为未修改，最初些的样式代码。）
2.移动设备界面
4.示例代码：
<html>
<head>
<title></title>
<meta name="viewport" content="width=320,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no" />
<meta content="">
<style>
.navbar{
background-color: #34495E;
height: 50px;
display: block;
}
.navbar .nav-list{
z-index: 0;
display: block;
}
.navbar .nav-list li{
list-style: none;
float: left;
margin-left: 30px;
}
.navbar .nav-list a{
color: white;
line-height: 50px;
text-decoration-line: none;
}
.navbar .nav-list a:hover{
color: #1ABC9C;
}
.navbar input:checked~.nav-list {
position: absolute;
padding-bottom: 5px;
padding-left: 5px;
padding-right: 5px;
display: block;
background-color: #34495E;
z-index: 0;
margin-top: 50px;
}
.navbar input:checked~.nav-list li{
clear: both;
background-color: #34495E;
}
.navbar label{
display: none;
}
.navbar .nav-toggle{
display: none;
}
@media screen and (max-width: 600px) {
.navbar .nav-toggle{
display: none;
}
.navbar label{
display: block;
z-index: 4;
}
.navbar .nav-list{
display: none;
margin-left: 0px;
}
.navbar .nav-list li{
margin-left: 0px;
}
.navbar .menu-icon{
display: block;
float: left;
width: 36px;
height: 26px;
line-height: 0;
padding-top: 10px;
text-align: center;
}
.navbar .menu-icon>svg path{
fill: white;
}
.navbar label[for="nav-toggler"] {
display: block;
float: left;
width: 36px;
height: 36px;
z-index: 2;
cursor: pointer;
}
}
</style>
</head>
<body>
<header>
<nav class="navbar">
<input type="checkbox" id="nav-toggle" class="nav-toggle"/>
<label for="nav-toggle">
<span class="menu-icon">
<svg viewBox="0 0 18 15" width="18px" height="15px">
<path fill="white" d="M18,1.484c0,0.82-0.665,1.484-1.484,1.484H1.484C0.665,2.969,0,2.304,0,1.484l0,0C0,0.665,0.665,0,1.484,0 h15.031C17.335,0,18,0.665,18,1.484L18,1.484z"/>
<path fill="white" d="M18,7.516C18,8.335,17.335,9,16.516,9H1.484C0.665,9,0,8.335,0,7.516l0,0c0-0.82,0.665-1.484,1.484-1.484 h15.031C17.335,6.031,18,6.696,18,7.516L18,7.516z"/>
<path fill="white" d="M18,13.516C18,14.335,17.335,15,16.516,15H1.484C0.665,15,0,14.335,0,13.516l0,0 c0-0.82,0.665-1.484,1.484-1.484h15.031C17.335,12.031,18,12.696,18,13.516L18,13.516z"/>
</svg>
</span>
</label>
<ul class="nav-list">
<li><a href="#">菜单一
</a></li>
<li><a href="#">菜单二
</a></li>
<li><a href="#">菜单三
</a></li>
</div>
</nav>
</header>
</body>
</html>
（导航栏菜单按钮为svg绘图，可以换成图片。本代码参照jekyll minima主题的导航栏实现的。）
