下面时一个带图标的下拉列表框样例，点击右侧的向下箭头可以打开或者收缩菜单。其中图标使用的是 Font Awesome 字体图标。Font Awesome字体图标的用法可以查看我前面写的文章：CSS3 - 在html页面中使用Font Awesome字体图标
<!doctype html>
<html lang="en">
<head>
<title>hangge.com</title>
<link rel="stylesheet" href="font-awesome/css/font-awesome.min.css">
<style>
* {
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
}
*:before,
*:after {
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
}
body {
font-family: proxima-nova, "Helvetica Neue", Helvetica, Arial, sans-serif;
font-size: 14px;
line-height: 1.42857143;
color: #333333;
background-color: #ffffff;
}
button,
input,
optgroup,
select,
textarea {
color: inherit;
font: inherit;
margin: 0;
}
a {
color: #21b384;
text-decoration: none;
}
a:hover,
a:focus {
color: #198764;
text-decoration: underline;
}
a:focus {
outline: thin dotted;
outline: 5px auto -webkit-focus-ring-color;
outline-offset: -2px;
}
.btn {
display: inline-block;
margin-bottom: 0;
font-weight: normal;
text-align: center;
vertical-align: middle;
touch-action: manipulation;
cursor: pointer;
background-image: none;
border: 1px solid transparent;
white-space: nowrap;
padding: 6px 12px;
font-size: 14px;
line-height: 1.42857143;
border-radius: 4px;
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
}
.btn:focus,
.btn:active:focus,
.btn.active:focus,
.btn.focus,
.btn:active.focus,
.btn.active.focus {
outline: thin dotted;
outline: 5px auto -webkit-focus-ring-color;
outline-offset: -2px;
}
.btn:hover,
.btn:focus,
.btn.focus {
color: #333333;
text-decoration: none;
}
.btn:active,
.btn.active {
outline: 0;
background-image: none;
-webkit-box-shadow: inset 0 3px 5px rgba(0, 0, 0, 0.125);
box-shadow: inset 0 3px 5px rgba(0, 0, 0, 0.125);
}
/***** 4 *****/
.btn-group,
.btn-group-vertical {
position: relative;
display: inline-block;
vertical-align: middle;
}
.btn-group > .btn,
.btn-group-vertical > .btn {
position: relative;
float: left;
}
.btn-group > .btn {
position: relative;
float: left;
}
.btn-group .btn + .btn,
.btn-group .btn + .btn-group,
.btn-group .btn-group + .btn,
.btn-group .btn-group + .btn-group {
margin-left: -1px;
}
.btn-group > .btn:not(:first-child):not(:last-child):not(.dropdown-toggle) {
border-radius: 0;
}
.btn-group > .btn:first-child {
margin-left: 0;
}
.btn-group > .btn:first-child:not(:last-child):not(.dropdown-toggle) {
border-bottom-right-radius: 0;
border-top-right-radius: 0;
}
.btn-group > .btn:last-child:not(:first-child),
.btn-group > .dropdown-toggle:not(:first-child) {
border-bottom-left-radius: 0;
border-top-left-radius: 0;
}
/***** 6 *****/
.btn-group,
.btn-group-vertical {
position: relative;
display: inline-block;
vertical-align: middle;
}
.btn-group > .btn,
.btn-group-vertical > .btn {
position: relative;
float: left;
}
.btn-group > .btn:hover,
.btn-group-vertical > .btn:hover,
.btn-group > .btn:focus,
.btn-group-vertical > .btn:focus,
.btn-group > .btn:active,
.btn-group-vertical > .btn:active,
.btn-group > .btn.active,
.btn-group-vertical > .btn.active {
z-index: 2;
}
.btn-group .btn + .btn,
.btn-group .btn + .btn-group,
.btn-group .btn-group + .btn,
.btn-group .btn-group + .btn-group {
margin-left: -1px;
}
.btn-primary {
color: #ffffff;
background-color: #337ab7;
border-color: #2e6da4;
}
.btn-primary:focus,
.btn-primary.focus {
color: #ffffff;
background-color: #286090;
border-color: #122b40;
}
.btn-primary:hover {
color: #ffffff;
background-color: #286090;
border-color: #204d74;
}
.btn-group > .btn + .dropdown-toggle {
padding-left: 8px;
padding-right: 8px;
}
.dropdown-toggle:focus {
outline: 0;
}
.dropdown-menu {
position: absolute;
top: 100%;
left: 0;
z-index: 1000;
display: none;
float: left;
min-width: 160px;
padding: 5px 0;
margin: 2px 0 0;
list-style: none;
font-size: 14px;
text-align: left;
background-color: #ffffff;
border: 1px solid #cccccc;
border: 1px solid rgba(0, 0, 0, 0.15);
border-radius: 4px;
-webkit-box-shadow: 0 6px 12px rgba(0, 0, 0, 0.175);
box-shadow: 0 6px 12px rgba(0, 0, 0, 0.175);
background-clip: padding-box;
}
.dropdown-menu.pull-right {
right: 0;
left: auto;
}
.dropdown-menu .divider {
height: 1px;
margin: 9px 0;
overflow: hidden;
background-color: #e5e5e5;
}
.dropdown-menu > li > a {
display: block;
padding: 3px 20px;
clear: both;
font-weight: normal;
line-height: 1.42857143;
color: #333333;
white-space: nowrap;
}
.dropdown-menu > li > a:hover,
.dropdown-menu > li > a:focus {
text-decoration: none;
color: #262626;
background-color: #f5f5f5;
}
.dropdown-menu > .active > a,
.dropdown-menu > .active > a:hover,
.dropdown-menu > .active > a:focus {
color: #ffffff;
text-decoration: none;
outline: 0;
background-color: #1d9d74;
}
.dropdown-menu > .disabled > a,
.dropdown-menu > .disabled > a:hover,
.dropdown-menu > .disabled > a:focus {
color: #777777;
}
.dropdown-menu > .disabled > a:hover,
.dropdown-menu > .disabled > a:focus {
text-decoration: none;
background-color: transparent;
background-image: none;
filter: progid:DXImageTransform.Microsoft.gradient(enabled = false);
cursor: not-allowed;
}
.open > .dropdown-menu {
display: block;
}
.open > a {
outline: 0;
}
</style>
<script>
function menuOpenClose() {
var menu = document.getElementById('menu');
var c = menu.className;
//有more属性
if(c != null && c.indexOf('open') > -1){
menu.className = c.replace('open', '');
}else{
menu.className = c + ' open';
}
}
</script>
</head>
<body>
<div id="menu" class="btn-group">
<a class="btn btn-primary" href="#"><i class="fa fa-user fa-fw"></i> User</a>
<a class="btn btn-primary dropdown-toggle" data-toggle="dropdown" href="#"
onclick="menuOpenClose()">
<span class="fa fa-caret-down"></span></a>
<ul class="dropdown-menu">
<li><a href="#"><i class="fa fa-pencil fa-fw"></i> Edit</a></li>
<li><a href="#"><i class="fa fa-trash-o fa-fw"></i> Delete</a></li>
<li><a href="#"><i class="fa fa-ban fa-fw"></i> Ban</a></li>
<li class="divider"></li>
<li><a href="#"><i class="i"></i> Make admin</a></li>
</ul>
</div>
</body>
</html>
原文出自：www.hangge.com