在网页制作中我们常常需要折叠式的菜单，在折叠菜单中，手风琴特效的菜单是非常受欢迎，下面就讲解使用jQuery+HTML+CSS3实现垂直手风琴折叠菜单的方法。
jQuery实现垂直手风琴折叠菜单示例代码
首先给出手风琴折叠菜单的HTML代码，如下所示：
<!DOCTYPE html>
<html> <head> <meta charset="UTF-8"> <title>CSS3垂直手风琴折叠菜单DEMO演示</title> <meta name="viewport" content="width=device-width, initial-scale=1">
<!-- Iconos -->
<link href="css/font-awesome.min.css" rel="stylesheet"> <link rel="stylesheet" href="css/style.css" media="screen" type="text/css" /> </head> <body> <!-- Contenedor -->
<ul id="accordion" class="accordion">
<li>
<div class="link"><i class="fa fa-paint-brush"></i>Diseño web<i class="fa fa-chevron-down"></i></div>
<ul class="submenu">
<li><a href="#">Photoshop</a></li>
<li><a href="#">HTML</a></li>
<li><a href="#">CSS</a></li>
<li><a href="#">Maquetacion web</a></li>
</ul>
</li>
<li>
<div class="link"><i class="fa fa-code"></i>Desarrollo front-end<i class="fa fa-chevron-down"></i></div>
<ul class="submenu">
<li><a href="#">Javascript</a></li>
<li><a href="#">jQuery</a></li>
<li><a href="#">Frameworks javascript</a></li>
</ul>
</li>
<li>
<div class="link"><i class="fa fa-mobile"></i>Diseño responsive<i class="fa fa-chevron-down"></i></div>
<ul class="submenu">
<li><a href="#">Tablets</a></li>
<li><a href="#">Dispositivos mobiles</a></li>
<li><a href="#">Medios de escritorio</a></li>
<li><a href="#">Otros dispositivos</a></li>
</ul>
</li>
<li><div class="link"><i class="fa fa-globe"></i>Posicionamiento web<i class="fa fa-chevron-down"></i></div>
<ul class="submenu">
<li><a href="#">Google</a></li>
<li><a href="#">Bing</a></li>
<li><a href="#">Yahoo</a></li>
<li><a href="#">Otros buscadores</a></li>
</ul>
</li>
</ul> <script src='js/jquery.js'></script> <script src="js/index.js"></script>
</body> </html>
如上面的代码，首先需要引入font-awesome.min.css，这是awesome的字体库。然后需要引入自定义的css，style.css代码如下面所示：
* {
margin: ;
padding: ;
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
}
body {
background: #2d2c41;
font-family: 'Open Sans', Arial, Helvetica, Sans-serif, Verdana, Tahoma;
}
ul {
list-style-type: none;
}
a {
color: #b63b4d;
text-decoration: none;
}
/** =======================
* Contenedor Principal
===========================*/
h1 {
color: #FFF;
font-size: 24px;
font-weight: ;
text-align: center;
margin-top: 80px;
}
h1 a {
color: #c12c42;
font-size: 16px;
}
.accordion {
width: %;
max-width: 360px;
margin: 30px auto 20px;
background: #FFF;
-webkit-border-radius: 4px;
-moz-border-radius: 4px;
border-radius: 4px;
}
.accordion .link {
cursor: pointer;
display: block;
padding: 15px 15px 15px 42px;
color: #4D4D4D;
font-size: 14px;
font-weight: ;
border-bottom: 1px solid #CCC;
position: relative;
-webkit-transition: all .4s ease;
-o-transition: all .4s ease;
transition: all .4s ease;
}
.accordion li:last-child .link {
border-bottom: ;
}
.accordion li i {
position: absolute;
top: 16px;
left: 12px;
font-size: 18px;
color: #;
-webkit-transition: all .4s ease;
-o-transition: all .4s ease;
transition: all .4s ease;
}
.accordion li i.fa-chevron-down {
right: 12px;
left: auto;
font-size: 16px;
}
.accordion li.open .link {
color: #b63b4d;
}
.accordion li.open i {
color: #b63b4d;
}
.accordion li.open i.fa-chevron-down {
-webkit-transform: rotate(180deg);
-ms-transform: rotate(180deg);
-o-transform: rotate(180deg);
transform: rotate(180deg);
}
/**
* Submenu
-----------------------------*/
.submenu {
display: none;
background: #;
font-size: 14px;
}
.submenu li {
border-bottom: 1px solid #4b4a5e;
}
.submenu a {
display: block;
text-decoration: none;
color: #d9d9d9;
padding: 12px;
padding-left: 42px;
-webkit-transition: all .25s ease;
-o-transition: all .25s ease;
transition: all .25s ease;
}
.submenu a:hover {
background: #b63b4d;
color: #FFF;
}
使用jQuery&HTML&CSS3实现垂直手风琴折叠菜单就必须使用jQuery，所以一定要引入jQuery库。然后配合自定义的js，index.js代码如下所示：
$(function() {
var Accordion = function(el, multiple) {
this.el = el || {};
this.multiple = multiple || false;
// Variables privadas
var links = this.el.find('.link');
// Evento
links.on('click', {el: this.el, multiple: this.multiple}, this.dropdown)
}
Accordion.prototype.dropdown = function(e) {
var $el = e.data.el;
$this = $(this),
$next = $this.next();
$next.slideToggle();
$this.parent().toggleClass('open');
if (!e.data.multiple) {
$el.find('.submenu').not($next).slideUp().parent().removeClass('open');
};
}
var accordion = new Accordion($('#accordion'), false);
});
这样我们可以看到下面的图片效果：
