'''
下拉菜单
    dropdown/dropup
        dropdown-menu dropdown-menu-right
            divider
            dropdown-header
            disabled
按钮组
    btn-toolbar
        btn-group btn-group-lg/
    btn-group-vertical
        btn-group btn-group-justified

按钮式下拉菜单
    btn-group
    分裂
        button

输入框组
    input-group
        input-group-addon
        input-group-btn

导航
    nav nav-tabs
        nav-pills

        nav-stacked
        nav-justified

        active
        disabled
导航条
    navbar  navbar-default/inverse navbar-fixed-top/bottom navbar-static-top
        navbar-header
            button  data-target="#id"
            span
            a navbar-brand  span

        collapse navbar-collapse    id
            ul navbar-nav
            form navbar-form
            button navbar-button
            p navbar-text

            navbar-left
            navbar-right
路径导航
    ol breadcrumb

分页
    pagination  pagination-lg/sm/xs
        «
        »
    pager
        previous
        next
        ←
        →

标签
    label   label-default/success/

徽章
    badge

巨幕
    jumbotron
        container
            xx

页头
    page-header

缩略图
    栅格系统
        thumbnail
            caption

警告框
    alert   alert-success/
        alert-link

进度条
    progress
        progress-bar progress-bar-success/
        min-width: em; width= %;
        progress-bar-striped active

媒体对象
    media
        media-left
            media-object
        media-body
            media-heading
        media-right
    media-list

列表组
    list-group
        list-group-item active disabled
        list-group-item-success
            list-group-item-heading
            list-group-item-text

面板
    panel panel-success/
        panel-heading
            panel-title
        panel-body
        panel-footer
        table
        list-group

well
well-lg/sm
'''