移动端相应式菜单用js和CSS3媒体查询实现

<pre><nav>
<div id="menu_button_wrapper">
<div id="menu_button">
Menu&nbsp;&nbsp;
<div id="hamburger">
<span></span>
<span></span>
<span></span>
</div>
</div>
<div class="clearfix"></div>
</div>

<ul id="menu_list">
<li class="current_page"><a href="#">Home</a></li>
<li><a href="#">Audio</a></li>
<li><a href="#">Video</a></li>
<li><a href="#">About Us</a></li>
<li><a href="#">Contacts</a></li>
</ul>
</nav></pre>

<pre><script src="js/script.js"></script></pre>

<pre>nav {
font-family: Helvetica;
text-align: right;
text-transform: uppercase;
background-color: #222;
}

nav ul {
width: 90%;
max-width: 1024px;
margin: 0 auto;
list-style-type: none;
}

nav ul li { display: inline-block; }

nav ul li a {
color: #9d9d9d;
font-weight: bold;
text-decoration: none;
display: inline-block;
padding: 1em;
box-sizing: border-box;
}

nav ul li a:hover { color: white; }

.current_page { background-color: black; }

.current_page a { color: white; }

#menu_button_wrapper { display: none; }

.hidden { display: none; }</pre>

<pre>@media (max-width: 760px) {

#menu_button_wrapper {
display: block;
padding: 1em;
color: #9d9d9d;
border-bottom: 1px solid #101010;
-webkit-box-shadow: 0 1px 0 rgba(255,255,255,.1);
box-shadow: 0 1px 0 rgba(255,255,255,.1);
margin-bottom: .5em;
}

#menu_button {
box-sizing: border-box;
float: right;
padding: .5em 1em;
border: 1px solid #333;
border-radius: 5px;
color: white;
-webkit-touch-callout: none;
-webkit-user-select: none;
-khtml-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
}

#menu_button:hover {
cursor: pointer;
background-color: #333;
}

#hamburger {
float: right;
padding-top: .15em;
}

#menu_button span {
display: block;
background-color: #fff;
width: 1.2em;
height: .15em;
border-radius: 1px;
margin-bottom: .2em;
}

nav ul {
width: 100%;
margin: 0 auto;
padding: 0;
box-sizing: border-box;
}

nav ul li { display: block; }

nav ul li a { width: 100%; }

}</pre>