侧边栏在响应式设计中起到很大的作用，当屏幕小到手机的屏幕时，能够自适应屏幕大小的侧边栏固然能够为网站添加色彩，那么在Bootstrap的框架中提供了导航条和下拉菜单的组件，详情请自行到官网Bootstrap的文档查看，这里就不作介绍了。
本文是将其中的导航条和下拉菜单进行结合，然后设计并改进了侧边栏的制作。
html:
<div class="container">
<nav class="navbar navbar-default mynavbar">
<div class="container-fluid">
<!--按钮-->
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed btn-sider" data-toggle="collapse" data-target="#side-menu" aria-expanded="false">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
</div>
<!-- 导航条内容 -->
<div class="collapse navbar-collapse" id="side-menu">
<ul class="nav navbar-nav" id="side-item">
<li><a href="#">后端开发</a></li>
<li><a href="#">数据库</a></li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" id="web-item" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">前端开发 <span class="caret"></span></a>
<!--下拉菜单按钮-->
<ul class="dropdown-menu">
<li><a href="#">HTML/CSS</a></li>
<li><a href="#">JavaScript</a></li>
<li><a href="#">jQuery</a></li>
<li><a href="#">Bootstrap</a></li>
<li><a href="#">node.js</a></li>
</ul>
</li>
<li><a href="#">移动开发</a></li>
<li><a href="#">视觉设计</a></li>
<li><a href="#">云计算</a></li>
</ul>
</div>
</div>
</nav>
</div>
css:
.mynavbar{
background-color: #fff;
border:none;
}
.navbar-header,#side-item{
background-color: #0b3558;
}
#side-menu>ul>li>a{
color:#fff;
font-size: 18px;
font-family: "Microsoft Yahei", Helvetica, sans-serif, Lato;
}
#side-menu>ul{
width: 100%;
}
#side-menu>ul>li{
text-align: center;
width: 16%;
margin-left: 5px;
}
#side-menu .dropdown-menu {
border: none;
-webkit-box-shadow: 0 6px 12px rgba(0,0,0,.175);
box-shadow: 0 6px 12px rgba(0,0,0,.175);
}
#side-item .dropdown-menu>li>a:focus, .dropdown-menu>li>a:hover,#side-item>li>a:focus,#side-item >li>a:hover {
color: #24b0ff;
text-decoration: none;
background-color: transparent;
}
.btn-sider{
float: left;
border:none;
outline: none;
margin-left: 10px;
}
.mynavbar .btn-sider .icon-bar{
background-color:#fff;
width:23px;
height:3px;
}
.mynavbar .btn-sider:focus, .mynavbar .btn-sider:hover {
background-color: transparent;
}
@media (max-width: 768px) {
.container {
padding-left: 0px;
}
#side-menu{
border: none;
}
#side-item{
background: rgba(43, 54, 67, 0.97);
}
#side-menu>ul {
margin-top: 0px;
margin-right: 0px;
margin-left: -15px;
margin-bottom: 0px;
width: 40%;
height: 999px;
}
#side-menu>ul>li {
text-align: left;
width:100%;
margin-left:0px;
}
#side-menu>ul>li a{
font-size:16px;
}
#side-item>li>a:focus,#side-item >li>a:hover,#side-item .dropdown-menu>li>a:focus, .dropdown-menu>li>a:hover{
background-color: #38a99c;
color:#fff;
}
#side-menu .dropdown-menu{
box-shadow:none;
}
#side-menu .dropdown-menu li a{
padding-top:10px;
color:#fff;
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持找一找教程网。
如果大家还想深入学习，可以点击这里进行学习，再为大家附两个精彩的专题：Bootstrap学习教程 Bootstrap实战教程
