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<title>bootstrap基础学习【菜单、按钮、导航】（四）</title>
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<h3><strong>1.下拉菜单（基本用法）</strong></h3>
1、使用一个名为“dropdown”的容器包裹了整个下拉菜单元素，示例中为:
div class="dropdown" /div<br>
2、使用了一个 button 按钮做为父菜单，并且定义类名“dropdown-toggle”和自定义“data-toggle”属性，且值必须和最外容器类名一致，此示例为:
data-toggle="dropdown"<br>
3、下拉菜单项使用一个ul列表，并且定义一个类名为“dropdown-menu”，此示例为:ul class="dropdown-menu"
<div class="dropdown">
<button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown">
下拉菜单
<span class="caret"></span>
</button>
<ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1">
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
</ul>
</div>
<h3><strong>2.下拉菜单（下拉分割线）</strong></h3>
下拉分隔线，假设下拉菜单有两个组，那么组与组之间可以通过添加一个空的 li ，
并且给这个 li 添加类名“divider”来实现添加下拉分隔线的功能
<div class="dropdown">
<button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown">
下拉菜单
<span class="caret"></span>
</button>
<ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1">
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation" class="divider"></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
</ul>
</div>
<h3><strong>3.下拉菜单（菜单标题）</strong></h3>
<div class="dropdown">
<button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown">
下拉菜单
<span class="caret"></span>
</button>
<ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1">
<li role="presentation" class="dropdown-header">第一部分菜单头部</li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation" class="divider"></li>
<li role="presentation" class="dropdown-header">第二部分菜单头部</li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
</ul>
</div>
<div class="clearfix"></div>
<h3><strong>4.下拉菜单（对齐方式）</strong></h3>
<style>
.dropdown{
float: left;
}
</style>
<h4>使用pull-right类使下拉菜单与父容器右边对齐</h4><br>
Bootstrap框架中下拉菜单默认是左对齐，如果你想让下拉菜单相对于父容器右对齐时，<br />
可以在“dropdown-menu”上添加一个“pull-right”或者“dropdown-menu-right”类名，<br />
“pull-right”类可以用“dropdown-menu-right”代替，两个类的作用是一样的<br/>
同时一定要为.dropdown添加float:left css样式。
<div class="dropdown">
<button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown">
下拉菜单
<span class="caret"></span>
</button>
<ul class="dropdown-menu pull-right" role="menu" aria-labelledby="dropdownMenu1">
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation" class="divider"></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
</ul>
</div>
<br />
<br />
<h4>使用dropdown-menu-right类使下拉菜单与父容器右边对齐</h4>
<div class="dropdown">
<button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown">
下拉菜单
<span class="caret"></span>
</button>
<ul class="dropdown-menu dropdown-menu-right" role="menu" aria-labelledby="dropdownMenu1">
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation" class="divider"></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
</ul>
</div>
<br />
<br />
<h4>下拉菜单与父容器左边对齐</h4>
<div class="dropdown">
<button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown">
下拉菜单
<span class="caret"></span>
</button>
<ul class="dropdown-menu dropdown-menu-left" role="menu" aria-labelledby="dropdownMenu1">
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation" class="divider"></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
</ul>
</div>
<div class="clearfix"></div>
<h3><strong>5.下拉菜单（菜单项状态）</strong></h3>
当前状态（.active）和禁用状态（.disabled）。这两种状态使用方法只需要在对应的菜单项上添加对应的类名
<div class="dropdown">
<button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown">
下拉菜单
<span class="caret"></span>
</button>
<ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1">
<li role="presentation" class="active"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation" class="divider"></li>
<li role="presentation" class="disabled"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
</ul>
</div>
<div class="clearfix"></div>
<h3><strong>6.按钮（按钮组）</strong></h3>
“.btn-group”容器里的标签元素需要带有类名“.btn”
<div class="btn-group">
<button type="button" class="btn btn-default"><span class="glyphicon glyphicon-step-backward"></span></button>
<button type="button" class="btn btn-default"><span class="glyphicon glyphicon-fast-backward"></span></button>
<button type="button" class="btn btn-default"><span class="glyphicon glyphicon-backward"></span></button>
<button type="button" class="btn btn-default"><span class="glyphicon glyphicon-play"></span></button>
<button type="button" class="btn btn-default"><span class="glyphicon glyphicon-pause"></span></button>
<button type="button" class="btn btn-default"><span class="glyphicon glyphicon-stop"></span></button>
<button type="button" class="btn btn-default"><span class="glyphicon glyphicon-forward "></span></button>
<button type="button" class="btn btn-default"><span class="glyphicon glyphicon-fast-forward"></span></button>
<button type="button" class="btn btn-default"><span class="glyphicon glyphicon-step-forward"></span></button>
</div>
<h3><strong>7.按钮（按钮工具栏）</strong></h3>
将按钮组“btn-group”按组放在一个大的容器“btn-toolbar”中<br>
☑ .btn-group-lg:大按钮组<br>
☑ .btn-group-sm:小按钮组<br>
☑ .btn-group-xs:超小按钮组<br>
只需要在“.btn-group”类名上追加对应的类名，就可以得到不同大小的按钮组
<div class="btn-toolbar">
<div class="btn-group">
<button type="button" class="btn btn-default"><span class="glyphicon glyphicon-align-left"></span></button>
<button type="button" class="btn btn-default"><span class="glyphicon glyphicon-align-center"></span></button>
<button type="button" class="btn btn-default"><span class="glyphicon glyphicon-align-right"></span></button>
<button type="button" class="btn btn-default"><span class="glyphicon glyphicon-align-justify"></span></button>
</div>
<div class="btn-group">
<button type="button" class="btn btn-default"><span class="glyphicon glyphicon-indent-left"></span></button>
<button type="button" class="btn btn-default"><span class="glyphicon glyphicon-indent-right"></span></button>
</div>
<div class="btn-group">
<button type="button" class="btn btn-default"><span class="glyphicon glyphicon-font"></span></button>
<button type="button" class="btn btn-default"><span class="glyphicon glyphicon-bold"></span></button>
<button type="button" class="btn btn-default"><span class="glyphicon glyphicon-italic"></span></button>
</div>
<div class="btn-group">
<button type="button" class="btn btn-default"><span class="glyphicon glyphicon-text-height"></span></button>
<button type="button" class="btn btn-default"><span class="glyphicon glyphicon-text-width"></span></button>
</div>
</div>
<br />
<br />
<div class="btn-toolbar">
<div class="btn-group btn-group-lg">
<button type="button" class="btn btn-default"><span class="glyphicon glyphicon-align-left"></span></button>
<button type="button" class="btn btn-default"><span class="glyphicon glyphicon-align-center"></span></button>
<button type="button" class="btn btn-default"><span class="glyphicon glyphicon-align-right"></span></button>
<button type="button" class="btn btn-default"><span class="glyphicon glyphicon-align-justify"></span></button>
</div>
<div class="btn-group">
<button type="button" class="btn btn-default"><span class="glyphicon glyphicon-indent-left"></span></button>
<button type="button" class="btn btn-default"><span class="glyphicon glyphicon-indent-right"></span></button>
</div>
<div class="btn-group btn-group-sm">
<button type="button" class="btn btn-default"><span class="glyphicon glyphicon-font"></span></button>
<button type="button" class="btn btn-default"><span class="glyphicon glyphicon-bold"></span></button>
<button type="button" class="btn btn-default"><span class="glyphicon glyphicon-italic"></span></button>
</div>
<div class="btn-group btn-group-xs">
<button type="button" class="btn btn-default"><span class="glyphicon glyphicon-text-height"></span></button>
<button type="button" class="btn btn-default"><span class="glyphicon glyphicon-text-width"></span></button>
</div>
</div>
<h3><strong>8.按钮（嵌套分组）</strong></h3>
<div class="btn-group">
<button class="btn btn-default" type="button">首页</button>
<button class="btn btn-default" type="button">产品展示</button>
<button class="btn btn-default" type="button">案例分析</button>
<button class="btn btn-default" type="button">联系我们</button>
<div class="btn-group">
<button class="btn btn-default dropdown-toggle" data-toggle="dropdown" type="button">关于我们<span class="caret"></span></button>
<ul class="dropdown-menu">
<li><a href="##">公司简介</a></li>
<li><a href="##">企业文化</a></li>
<li><a href="##">组织结构</a></li>
<li><a href="##">客服服务</a></li>
</ul>
</div>
</div>
<h3><strong>9.按钮（垂直分组）</strong></h3>
只需要把水平分组的“btn-group”类名换成“btn-group-vertical”即可<br>
<div class="btn-group-vertical">
<button class="btn btn-default" type="button">首页</button>
<button class="btn btn-default" type="button">产品展示</button>
<button class="btn btn-default" type="button">案例分析</button>
<button class="btn btn-default" type="button">联系我们</button>
<div class="btn-group">
<button class="btn btn-default dropdown-toggle" data-toggle="dropdown" type="button">关于我们<span class="caret"></span></button>
<ul class="dropdown-menu">
<li><a href="##">公司简介</a></li>
<li><a href="##">企业文化</a></li>
<li><a href="##">组织结构</a></li>
<li><a href="##">客服服务</a></li>
</ul>
</div>
</div>
<h3><strong>10.按钮（等分按钮）</strong></h3>
移动端上特别的实用，只需要在按钮组“btn-group”上追加一个“btn-group-justified”类名，
在制作等分按钮组时，请尽量使用a标签元素来制作按钮，因为使用button标签元素时，使用display:table在部分浏览器下支持并不友好
<div class="btn-wrap">
<div class="btn-group btn-group-justified">
<a class="btn btn-default" href="#">首页</a>
<a class="btn btn-default" href="#">产品展示</a>
<a class="btn btn-default" href="#">案例分析</a>
<a class="btn btn-default" href="#">联系我们</a>
</div>
</div>
<h3><strong>11.按钮下拉菜单</strong></h3>
<div class="btn-group">
<button class="btn btn-default dropdown-toggle" data-toggle="dropdown" type="button">按钮下拉菜单<span class="caret"></span></button>
<ul class="dropdown-menu">
<li><a href="##">按钮下拉菜单项</a></li>
<li><a href="##">按钮下拉菜单项</a></li>
<li><a href="##">按钮下拉菜单项</a></li>
<li><a href="##">按钮下拉菜单项</a></li>
</ul>
</div>
<h3><strong>12.按钮的向下向上三角形、向上弹起的下拉菜单</strong></h3>
实现方法：需要在“.btn-group”类上追加“dropup”类名（这也是做向上弹起下拉菜单要用的类名）。
<div class="btn-group dropup">
<button class="btn btn-default dropdown-toggle" data-toggle="dropdown" type="button">按钮下拉菜单<span class="caret"></span></button>
<ul class="dropdown-menu">
<li><a href="##">按钮下拉菜单项</a></li>
<li><a href="##">按钮下拉菜单项</a></li>
<li><a href="##">按钮下拉菜单项</a></li>
<li><a href="##">按钮下拉菜单项</a></li>
</ul>
</div>
<h3><strong>13.导航(基础样式)</strong></h3>
Bootstrap框架中制作导航条主要通过“.nav”样式。默认的“.nav”样式不提供默认的导航样式，必须附加另外一个样式才会有效，比如“nav-tabs”、“nav-pills”之类
<ul class="nav nav-tabs">
<li><a href="##">Home</a></li>
<li><a href="##">CSS3</a></li>
<li><a href="##">Sass</a></li>
<li><a href="##">jQuery</a></li>
<li><a href="##">Responsive</a></li>
</ul>
<h3><strong>14.标签形(tab)导航（选项卡导航）</strong></h3>
<ul class="nav nav-tabs">
<li><a href="##">Home</a></li>
<li><a href="##">CSS3</a></li>
<li><a href="##">Sass</a></li>
<li><a href="##">jQuery</a></li>
<li><a href="##">Responsive</a></li>
</ul>
<br />
<ul class="nav nav-tabs">
<li class="active"><a href="##">Home</a></li>
<li><a href="##">CSS3</a></li>
<li><a href="##">Sass</a></li>
<li><a href="##">jQuery</a></li>
<li><a href="##">Responsive</a></li>
</ul>
<br />
<ul class="nav nav-tabs">
<li class="active"><a href="##">Home</a></li>
<li><a href="##">CSS3</a></li>
<li><a href="##">Sass</a></li>
<li><a href="##">jQuery</a></li>
<li class="disabled"><a href="##">Responsive</a></li>
</ul>
<h3><strong>15.导航（胶囊形(pills)导航）</strong></h3>
只需要把类名“nav-tabs”换成“nav-pills”即可
<ul class="nav nav-pills">
<li class="active"><a href="##">Home</a></li>
<li><a href="##">CSS3</a></li>
<li><a href="##">Sass</a></li>
<li><a href="##">jQuery</a></li>
<li class="disabled"><a href="##">Responsive</a></li>
</ul>
<h3><strong>16.导航（垂直堆叠的导航）</strong></h3>
制作垂直堆叠导航只需要在“nav-pills”的基础上添加一个“nav-stacked”类名即可
<ul class="nav nav-pills nav-stacked">
<li class="active"><a href="##">Home</a></li>
<li><a href="##">CSS3</a></li>
<li><a href="##">Sass</a></li>
<li><a href="##">jQuery</a></li>
<li class="disabled"><a href="##">Responsive</a></li>
</ul>
<br />
分隔线：只需要添加在导航项之间添加“li class=”nav-divider” /li”即可
<ul class="nav nav-pills nav-stacked">
<li class="active"><a href="##">Home</a></li>
<li><a href="##">CSS3</a></li>
<li><a href="##">Sass</a></li>
<li><a href="##">jQuery</a></li>
<li class="nav-divider"></li>
<li class="disabled"><a href="##">Responsive</a></li>
</ul>
<h3><strong>17.自适应导航（使用）</strong></h3>
自适应导航和前面使用“btn-group-justified”制作的自适应按钮组是一样的。
只不过在制作自适应导航时更换了另一个类名“nav-justified”。
当然他需要和“nav-tabs”或者“nav-pills”配合在一起使用<br>
实现原理：列表（ul）上设置宽度为“100%”，然后每个菜单项(li)设置了“display:table-cell”，
让列表项以模拟表格单元格的形式显示<br>
自适应导航仅在浏览器视窗宽度大于768px才能按100%宽度显示。
<ul class="nav nav-tabs nav-justified">
<li class="active"><a href="##">Home</a></li>
<li><a href="##">CSS3</a></li>
<li><a href="##">Sass</a></li>
<li><a href="##">jQuery</a></li>
<li><a href="##">Responsive</a></li>
</ul>
<br />
<ul class="nav nav-pills nav-justified">
<li class="active"><a href="##">Home</a></li>
<li><a href="##">CSS3</a></li>
<li><a href="##">Sass</a></li>
<li><a href="##">jQuery</a></li>
<li><a href="##">Responsive</a></li>
</ul>
<h3><strong>18.导航加下拉菜单（二级导航）</strong></h3>
只需要将li当作父容器，使用类名“dropdown”，同时在li中嵌套另一个列表ul<br>
分割线：只需要添加“li class=”nav-divider” /li”这样的一个空标签就可以了。
<ul class="nav nav-pills">
<li class="active"><a href="##">首页</a></li>
<li class="dropdown">
<a href="##" class="dropdown-toggle" data-toggle="dropdown">教程<span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="##">CSS3</a></li>
<li><a href="##">Sass</a></li>
<li><a href="##">jQuery</a></li>
<li><a href="##">Responsive</a></li>
</ul>
</li>
<li><a href="##">关于我们</a></li>
</ul>
<h3><strong>19.面包屑式导航</strong></h3>
<ol class="breadcrumb">
<li><a href="#">首页</a></li>
<li><a href="#">我的书</a></li>
<li class="active">《图解CSS3》</li>
</ol>
</body>
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