'''
bootstrap-css全局样式

布局容器
    container
    container-fluid

栅格系统
    row
        col-xs/sm/md/lg-n
        col-xs/sm/md/lg-offset-n
        col-xs/sm/md/lg-push-n
        col-xs/sm/md/lg-pull-n

排版
    标题
        .h1~h6 <h1~h6>
        .small <small>
    页面主体
        body
        p
            .lead
    字体
        mark .mark
        strong
        em/var/cite
        ins
        del
        small .small
    文本对齐
        text-left/justify/nowrap/right/center
    文本大小写
        text-lowercase/uppercase/capitalize
    情景文本颜色
        text-muted/success/info/primary/warning/danger
    文本隐藏
        text-hide
    缩略语
        abbr title class="initialism"
    地址
        address
    引用
        blockquote  class="blockquote-reverse"
        footer
代码
    code
    kbd
    pre class="pre-scrollable"
    samp

表格
    基本样式
        .table
        .table-striped
        .table-bordered
        .table-hover
        .table-condensed
    状态样式
        .active
        .success
        .info
        .warning
        .danger
    响应式表格
        .table-responsive
表单
    基本样式
        .form-inline
        .form-horizontal
        .form-group
            .form-group-lg/md/sm/xs
        .sr-only
            .sr-only-focusable
        .control-label
    文本域
        rows=""
    单选、多选
        .disabled
         disabled
        .radio
        .checkbox
        .radio-inline
        .checkbox-inline
    下拉菜单
        select
        multiple
    静态控件
        form-control-static
    input
        disabled
        readonly
            input-lg/sm
                col-xx-n
    help-text
        help-block
    校验状态
        has-success
        has-warning
        has-error
    反馈图标
        has-feedback
        <class="glyphicon glyphicon-ok/warning-sign/remove form-control-feedback">
按钮
    a = role="button"
    btn
        close
        btn-default/success/info/primary/warning/danger/link
        btn-lg/sm/xs
        btn-block
        disabled
图片设置
    img-responsive
        center-block
    img-rounded
    img-circle
    img-thumbnail

辅助类
    背景色
        bg-success/info/primary/warning/danger
    &times;
    倒三角
        .caret
    浮动
        pull-left
        pull-right
    清除浮动
        clearfix
    图片-内容居中
        center-block
    显示、隐藏内容
        show
        hidden
响应式工具
    visible-xs/sm/md/lg-*
        *: block/inline/inline-block
    hidden-xs/sm/md/lg
    打印类
        visible-print-*
            *: block/inline/inline-block
        hidden-print



'''