Bootstrap源码分析系列之核心CSS

妖狐艹你老母 2022-05-11 10:52 250阅读 0赞

本节主要介绍核心CSS，从整体架构中的7个Less文件对应的源码分别进行分析

### scaffolding.less ###

这个文件编译后的css文件(886~989行)其作用就像定义全局样式。

//调整css盒模型为border-box,这样修改使得添加padding不至于元素宽度超出边界 
    * { -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; }
    //由此可知IE8+都支持box-sizing: border-box;
    //对body input a 等一些元素进行初始化，还包括对图片，缩略图的处理
    html { font-size: 10px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); }
    //个人觉得这里的font-size: 10px;根本没起作用，会被body中定义的字体大小覆盖
    //-webkit-tap-highlight-color: rgba(0, 0, 0, 0);适用于webkit内核浏览器中取消可点击元素的半透明灰色背景
    body { font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; font-size: 14px; line-height: 1.42857143; color: #333; background-color: #fff; }
    input,
    button,
    select,
    textarea { font-family: inherit; font-size: inherit; line-height: inherit; }
    a { color: #428bca; text-decoration: none; }
    a:hover,
    a:focus { color: #2a6496; text-decoration: underline; }
    a:focus { outline: thin dotted; outline: 5px auto -webkit-focus-ring-color; outline-offset: -2px; }
    //这里定义a连接获得焦点的状态，除了outline: thin dotted;后面几个浏览器不全支持
    figure { margin: 0; }
    img { vertical-align: middle; }
    .img-responsive,
    .thumbnail > img,
    .thumbnail a > img,
    .carousel-inner > .item > img,
    .carousel-inner > .item > a > img { display: block; max-width: 100%; height: auto; }
    .img-rounded { border-radius: 6px; }
    .img-thumbnail { display: inline-block; max-width: 100%; height: auto; padding: 4px; line-height: 1.42857143; background-color: #fff; border: 1px solid #ddd; border-radius: 4px; -webkit-transition: all .2s ease-in-out; -o-transition: all .2s ease-in-out; transition: all .2s ease-in-out; }
    .img-circle { border-radius: 50%; }
    hr { margin-top: 20px; margin-bottom: 20px; border: 0; border-top: 1px solid #eee; }
    //定义在阅读屏幕中的样式
    .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); border: 0; }
    .sr-only-focusable:active,
    .sr-only-focusable:focus { position: static; width: auto; height: auto; margin: 0; overflow: visible; clip: auto; }

### type.less ###

排版样式，编译后对应源码为990~1335行

h1,
    h2,
    h3,
    h4,
    h5,
    h6,
    .h1,
    .h2,
    .h3,
    .h4,
    .h5,
    .h6 { font-family: inherit; font-weight: 500; line-height: 1.1; color: inherit; }
    h1 small,
    h2 small,
    h3 small,
    h4 small,
    h5 small,
    h6 small,
    .h1 small,
    .h2 small,
    .h3 small,
    .h4 small,
    .h5 small,
    .h6 small,
    h1 .small,
    h2 .small,
    h3 .small,
    h4 .small,
    h5 .small,
    h6 .small,
    .h1 .small,
    .h2 .small,
    .h3 .small,
    .h4 .small,
    .h5 .small,
    .h6 .small { font-weight: normal; line-height: 1; color: #777; }
    h1,
    .h1,
    h2,
    .h2,
    h3,
    .h3 { margin-top: 20px; margin-bottom: 10px; }
    h1 small,
    .h1 small,
    h2 small,
    .h2 small,
    h3 small,
    .h3 small,
    h1 .small,
    .h1 .small,
    h2 .small,
    .h2 .small,
    h3 .small,
    .h3 .small { font-size: 65%; }
    h4,
    .h4,
    h5,
    .h5,
    h6,
    .h6 { margin-top: 10px; margin-bottom: 10px; }
    h4 small,
    .h4 small,
    h5 small,
    .h5 small,
    h6 small,
    .h6 small,
    h4 .small,
    .h4 .small,
    h5 .small,
    .h5 .small,
    h6 .small,
    .h6 .small { font-size: 75%; }
    h1,
    .h1 { font-size: 36px; }
    h2,
    .h2 { font-size: 30px; }
    h3,
    .h3 { font-size: 24px; }
    h4,
    .h4 { font-size: 18px; }
    h5,
    .h5 { font-size: 14px; }
    h6,
    .h6 { font-size: 12px; }
    //对标题h1~h6样式定义，并定义了副标题small
    p { margin: 0 0 10px; }
    .lead { margin-bottom: 20px; font-size: 16px; font-weight: 300; line-height: 1.4; }
    @media (min-width: 768px) {.lead {font-size: 21px;}}
    //添加 .lead 类可以让段落突出显示
    small,
    .small { font-size: 85%; }
    mark,
    .mark { padding: .2em; background-color: #fcf8e3; }
    .text-left { text-align: left; }
    .text-right { text-align: right; }
    .text-center { text-align: center; }
    .text-justify { text-align: justify; }
    //文字对其样式
    .text-nowrap { white-space: nowrap; }
    .text-lowercase { text-transform: lowercase; }
    .text-uppercase { text-transform: uppercase; }
    .text-capitalize { text-transform: capitalize; }
    .text-muted { color: #777; }
    .text-primary { color: #428bca; }
    a.text-primary:hover { color: #3071a9; }
    .text-success { color: #3c763d; }
    a.text-success:hover { color: #2b542c; }
    .text-info { color: #31708f; }
    a.text-info:hover { color: #245269; }
    .text-warning { color: #8a6d3b; }
    a.text-warning:hover { color: #66512c; }
    .text-danger { color: #a94442; }
    a.text-danger:hover { color: #843534; }
    .bg-primary { color: #fff; background-color: #428bca; }
    a.bg-primary:hover { background-color: #3071a9; }
    .bg-success { background-color: #dff0d8; }
    a.bg-success:hover { background-color: #c1e2b3; }
    .bg-info { background-color: #d9edf7; }
    a.bg-info:hover { background-color: #afd9ee; }
    .bg-warning { background-color: #fcf8e3; }
    a.bg-warning:hover { background-color: #f7ecb5; }
    .bg-danger { background-color: #f2dede; }
    a.bg-danger:hover { background-color: #e4b9b9; }
    .page-header { padding-bottom: 9px; margin: 40px 0 20px; border-bottom: 1px solid #eee; }
    ul,
    ol { margin-top: 0; margin-bottom: 10px; }
    ul ul,
    ol ul,
    ul ol,
    ol ol { margin-bottom: 0; }
    .list-unstyled { padding-left: 0; list-style: none; }
    .list-inline { padding-left: 0; margin-left: -5px; list-style: none; }
    .list-inline > li { display: inline-block; padding-right: 5px; padding-left: 5px; }
    dl { margin-top: 0; margin-bottom: 20px; }
    dt,
    dd { line-height: 1.42857143; }
    dt { font-weight: bold; }
    dd { margin-left: 0; }
    @media (min-width: 768px) { .dl-horizontal dt { float: left; width: 160px; overflow: hidden; clear: left; text-align: right; text-overflow: ellipsis; white-space: nowrap; }le] { cursor: help; border-bottom: 1px dotted #777; }
    //列表样式
    .initialism { font-size: 90%; text-transform: uppercase; }
    blockquote { padding: 10px 20px; margin: 0 0 20px; font-size: 17.5px; border-left: 5px solid #eee; }
    blockquote p:last-child,
    blockquote ul:last-child,
    blockquote ol:last-child { margin-bottom: 0; }
    blockquote footer,
    blockquote small,
    blockquote .small { display: block; font-size: 80%; line-height: 1.42857143; color: #777; }
    blockquote footer:before,
    blockquote small:before,
    blockquote .small:before { content: '\2014 \00A0'; }
    .blockquote-reverse,
    blockquote.pull-right { padding-right: 15px; padding-left: 0; text-align: right; border-right: 5px solid #eee; border-left: 0; }
    .blockquote-reverse footer:before,
    blockquote.pull-right footer:before,
    .blockquote-reverse small:before,
    blockquote.pull-right small:before,
    .blockquote-reverse .small:before,
    blockquote.pull-right .small:before { content: ''; }
    .blockquote-reverse footer:after,
    blockquote.pull-right footer:after,
    .blockquote-reverse small:after,
    blockquote.pull-right small:after,
    .blockquote-reverse .small:after,
    blockquote.pull-right .small:after { content: '\00A0 \2014'; }
    //引用样式
    address { margin-bottom: 20px; font-style: normal; line-height: 1.42857143; }
    //地址或联系方式样式

### code.less ###

代码样式，编译后对应源码为1336~1389行

code,kbd,pre,samp { font-family: Menlo, Monaco, Consolas, "Courier New", monospace; }
    code { padding: 2px 4px; font-size: 90%; color: #c7254e; background-color: #f9f2f4; border-radius: 4px; }
    kbd { padding: 2px 4px; font-size: 90%; color: #fff; background-color: #333; border-radius: 3px; -webkit-box-shadow: inset 0 -1px 0 rgba(0, 0, 0, .25); box-shadow: inset 0 -1px 0 rgba(0, 0, 0, .25); }
    kbd kbd { padding: 0; font-size: 100%; font-weight: bold; -webkit-box-shadow: none; box-shadow: none; }
    pre { display: block; padding: 9.5px; margin: 0 0 10px; font-size: 13px; line-height: 1.42857143; color: #333; word-break: break-all; word-wrap: break-word; background-color: #f5f5f5; border: 1px solid #ccc; border-radius: 4px; }
    pre code { padding: 0; font-size: inherit; color: inherit; white-space: pre-wrap; background-color: transparent; border-radius: 0; }
    .pre-scrollable { max-height: 340px; overflow-y: scroll; }

### grid.less ###

栅格系统，编译后对应源码为1390~2056行  
关于栅格系统，新手会觉得它很难理解。其实你只要记住的总是把一个容器分成12列(colspan)，根据屏幕的大小(通过媒体查询@media)分为超小屏幕xs(x-small),小屏幕sm(small),中等屏幕md(middle)，大屏幕lg(large)  
在响应式布局中可以针对不同的屏幕大小给某一列添加多个类

每一列单元格可以嵌套，就像单元格的拆分一样，但是被嵌套的行（row）所包含的列（column）的个数不能超过12

<div class="row">
      <div class="col-sm-9">
        <div class="row">
          <div class="col-xs-8 col-sm-6">Level 2: .col-xs-8 .col-sm-6</div>
          <div class="col-xs-4 col-sm-6">Level 2: .col-xs-4 .col-sm-6</div>
        </div>
      </div>
    </div>

使用offset可以将列向右侧偏移，向右侧偏移的列数和这行剩下的列数总和为12

<div class="row">
      <div class="col-md-4">.col-md-4</div>
      <div class="col-md-4 col-md-offset-4">.col-md-4 .col-md-offset-4</div>
    </div>

通过使用push可以实现将列向右移，使用pull可以实现将列向右移

### tables.less ###

表格样式，编译后对应源码为2057~2296行  
table样式非常适合从框架中分离出来单独使用

table { background-color: transparent; }
    caption { padding-top: 8px; padding-bottom: 8px; color: #777; text-align: left; }
    th { text-align: left; }
    .table { width: 100%; max-width: 100%; margin-bottom: 20px; }
    .table > thead > tr > th,
    .table > tbody > tr > th,
    .table > tfoot > tr > th,
    .table > thead > tr > td,
    .table > tbody > tr > td,
    .table > tfoot > tr > td { padding: 8px; line-height: 1.42857143; vertical-align: top; border-top: 1px solid #ddd; }
    .table > thead > tr > th { vertical-align: bottom; border-bottom: 2px solid #ddd; }
    .table > caption + thead > tr:first-child > th,
    .table > colgroup + thead > tr:first-child > th,
    .table > thead:first-child > tr:first-child > th,
    .table > caption + thead > tr:first-child > td,
    .table > colgroup + thead > tr:first-child > td,
    .table > thead:first-child > tr:first-child > td { border-top: 0; }
    .table > tbody + tbody { border-top: 2px solid #ddd; }
    .table .table { background-color: #fff; }
    //table基本样式
    .table-condensed > thead > tr > th,
    .table-condensed > tbody > tr > th,
    .table-condensed > tfoot > tr > th,
    .table-condensed > thead > tr > td,
    .table-condensed > tbody > tr > td,
    .table-condensed > tfoot > tr > td { padding: 5px; }
    //紧缩表格，通过设置单元格padding来实现
    .table-bordered { border: 1px solid #ddd; }
    .table-bordered > thead > tr > th,
    .table-bordered > tbody > tr > th,
    .table-bordered > tfoot > tr > th,
    .table-bordered > thead > tr > td,
    .table-bordered > tbody > tr > td,
    .table-bordered > tfoot > tr > td { border: 1px solid #ddd; }
    .table-bordered > thead > tr > th,
    .table-bordered > thead > tr > td { border-bottom-width: 2px; }
    //带边框的表格，通过设置border来实现边框
    .table-striped > tbody > tr:nth-child(odd) { background-color: #f9f9f9; }
    //条纹状表格，通过更改奇数行的背景颜色来实现
    .table-hover > tbody > tr:hover { background-color: #f5f5f5; }
    table col[class*="col-"] { position: static; display: table-column; float: none; }
    table td[class*="col-"],
    table th[class*="col-"] { position: static; display: table-cell; float: none; }
    .table > thead > tr > td.active,
    .table > tbody > tr > td.active,
    .table > tfoot > tr > td.active,
    .table > thead > tr > th.active,
    .table > tbody > tr > th.active,
    .table > tfoot > tr > th.active,
    .table > thead > tr.active > td,
    .table > tbody > tr.active > td,
    .table > tfoot > tr.active > td,
    .table > thead > tr.active > th,
    .table > tbody > tr.active > th,
    .table > tfoot > tr.active > th { background-color: #f5f5f5; }
    //鼠标悬停在行或单元格上时所设置背景颜色
    .table-hover > tbody > tr > td.active:hover,
    .table-hover > tbody > tr > th.active:hover,
    .table-hover > tbody > tr.active:hover > td,
    .table-hover > tbody > tr:hover > .active,
    .table-hover > tbody > tr.active:hover > th { background-color: #e8e8e8; }
    //鼠标悬停背景颜色变化表格
    .table > thead > tr > td.success,
    .table > tbody > tr > td.success,
    .table > tfoot > tr > td.success,
    .table > thead > tr > th.success,
    .table > tbody > tr > th.success,
    .table > tfoot > tr > th.success,
    .table > thead > tr.success > td,
    .table > tbody > tr.success > td,
    .table > tfoot > tr.success > td,
    .table > thead > tr.success > th,
    .table > tbody > tr.success > th,
    .table > tfoot > tr.success > th { background-color: #dff0d8; }
    .table-hover > tbody > tr > td.success:hover,
    .table-hover > tbody > tr > th.success:hover,
    .table-hover > tbody > tr.success:hover > td,
    .table-hover > tbody > tr:hover > .success,
    .table-hover > tbody > tr.success:hover > th { background-color: #d0e9c6; }
    //标识成功或积极的动作
    .table > thead > tr > td.info,
    .table > tbody > tr > td.info,
    .table > tfoot > tr > td.info,
    .table > thead > tr > th.info,
    .table > tbody > tr > th.info,
    .table > tfoot > tr > th.info,
    .table > thead > tr.info > td,
    .table > tbody > tr.info > td,
    .table > tfoot > tr.info > td,
    .table > thead > tr.info > th,
    .table > tbody > tr.info > th,
    .table > tfoot > tr.info > th { background-color: #d9edf7; }
    .table-hover > tbody > tr > td.info:hover,
    .table-hover > tbody > tr > th.info:hover,
    .table-hover > tbody > tr.info:hover > td,
    .table-hover > tbody > tr:hover > .info,
    .table-hover > tbody > tr.info:hover > th { background-color: #c4e3f3; }
    //标识普通的提示信息或动作
    .table > thead > tr > td.warning,
    .table > tbody > tr > td.warning,
    .table > tfoot > tr > td.warning,
    .table > thead > tr > th.warning,
    .table > tbody > tr > th.warning,
    .table > tfoot > tr > th.warning,
    .table > thead > tr.warning > td,
    .table > tbody > tr.warning > td,
    .table > tfoot > tr.warning > td,
    .table > thead > tr.warning > th,
    .table > tbody > tr.warning > th,
    .table > tfoot > tr.warning > th { background-color: #fcf8e3; }
    .table-hover > tbody > tr > td.warning:hover,
    .table-hover > tbody > tr > th.warning:hover,
    .table-hover > tbody > tr.warning:hover > td,
    .table-hover > tbody > tr:hover > .warning,
    .table-hover > tbody > tr.warning:hover > th { background-color: #faf2cc; }
    //标识警告或需要用户注意
    .table > thead > tr > td.danger,
    .table > tbody > tr > td.danger,
    .table > tfoot > tr > td.danger,
    .table > thead > tr > th.danger,
    .table > tbody > tr > th.danger,
    .table > tfoot > tr > th.danger,
    .table > thead > tr.danger > td,
    .table > tbody > tr.danger > td,
    .table > tfoot > tr.danger > td,
    .table > thead > tr.danger > th,
    .table > tbody > tr.danger > th,
    .table > tfoot > tr.danger > th { background-color: #f2dede; }
    .table-hover > tbody > tr > td.danger:hover,
    .table-hover > tbody > tr > th.danger:hover,
    .table-hover > tbody > tr.danger:hover > td,
    .table-hover > tbody > tr:hover > .danger,
    .table-hover > tbody > tr.danger:hover > th { background-color: #ebcccc; }
    //标识危险或潜在的带来负面影响的动作
    .table-responsive { min-height: .01%; overflow-x: auto; }
    //min-height: .01%;消除IE9的BUG
    @media screen and (max-width: 767px) {
      .table-responsive {
        width: 100%;
        margin-bottom: 15px;
        overflow-y: hidden;
        -ms-overflow-style: -ms-autohiding-scrollbar;
        border: 1px solid #ddd;
      }
      .table-responsive > .table {
        margin-bottom: 0;
      }
      .table-responsive > .table > thead > tr > th,
      .table-responsive > .table > tbody > tr > th,
      .table-responsive > .table > tfoot > tr > th,
      .table-responsive > .table > thead > tr > td,
      .table-responsive > .table > tbody > tr > td,
      .table-responsive > .table > tfoot > tr > td {
        white-space: nowrap;
      }
      .table-responsive > .table-bordered {
        border: 0;
      }
      .table-responsive > .table-bordered > thead > tr > th:first-child,
      .table-responsive > .table-bordered > tbody > tr > th:first-child,
      .table-responsive > .table-bordered > tfoot > tr > th:first-child,
      .table-responsive > .table-bordered > thead > tr > td:first-child,
      .table-responsive > .table-bordered > tbody > tr > td:first-child,
      .table-responsive > .table-bordered > tfoot > tr > td:first-child {
        border-left: 0;
      }
      .table-responsive > .table-bordered > thead > tr > th:last-child,
      .table-responsive > .table-bordered > tbody > tr > th:last-child,
      .table-responsive > .table-bordered > tfoot > tr > th:last-child,
      .table-responsive > .table-bordered > thead > tr > td:last-child,
      .table-responsive > .table-bordered > tbody > tr > td:last-child,
      .table-responsive > .table-bordered > tfoot > tr > td:last-child {
        border-right: 0;
      }
      .table-responsive > .table-bordered > tbody > tr:last-child > th,
      .table-responsive > .table-bordered > tfoot > tr:last-child > th,
      .table-responsive > .table-bordered > tbody > tr:last-child > td,
      .table-responsive > .table-bordered > tfoot > tr:last-child > td {
        border-bottom: 0;
      }
    }
    //响应式中的表格

### forms.less ###

表单样式，编译后对应源码为2297~2781行

fieldset { min-width: 0; padding: 0; margin: 0; border: 0; }
    //min-width: 0;是的更像一个块状元素
    legend { display: block; width: 100%; padding: 0; margin-bottom: 20px; font-size: 21px; line-height: inherit; color: #333; border: 0; border-bottom: 1px solid #e5e5e5; }
    label { display: inline-block; max-width: 100%; margin-bottom: 5px; font-weight: bold; }
    input[type="search"] { -webkit-box-sizing: border-box; -moz-box-sizing: border-box; box-sizing: border-box; }
    input[type="radio"],
    input[type="checkbox"] { margin: 4px 0 0; margin-top: 1px \9; line-height: normal; }
    //margin-top: 1px\9;IE hack
    input[type="file"] { display: block; }
    input[type="range"] { display: block; width: 100%; }
    select[multiple],
    select[size] { height: auto; }
    input[type="file"]:focus, 
    input[type="radio"]:focus,
    input[type="checkbox"]:focus { outline: thin dotted; outline: 5px auto -webkit-focus-ring-color; outline-offset: -2px; }
    output { display: block; padding-top: 7px; font-size: 14px; line-height: 1.42857143; color: #555; }
    //output不同类型的输出，比如脚本的输出。IE不支持
    .form-control { display: block; width: 100%; height: 34px; padding: 6px 12px; font-size: 14px; line-height: 1.42857143; color: #555; background-color: #fff; background-image: none; border: 1px solid #ccc; border-radius: 4px; -webkit-box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075); box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075); -webkit-transition: border-color ease-in-out .15s, -webkit-box-shadow ease-in-out .15s; -o-transition: border-color ease-in-out .15s, box-shadow ease-in-out .15s; transition: border-color ease-in-out .15s, box-shadow ease-in-out .15s; }
    .form-control:focus { border-color: #66afe9; outline: 0; -webkit-box-shadow: inset 0 1px 1px rgba(0,0,0,.075), 0 0 8px rgba(102, 175, 233, .6); box-shadow: inset 0 1px 1px rgba(0,0,0,.075), 0 0 8px rgba(102, 175, 233, .6); }
    .form-control::-moz-placeholder { color: #999; opacity: 1; }
    .form-control:-ms-input-placeholder { color: #999; }
    .form-control::-webkit-input-placeholder { color: #999; }
    //表单控件样式
    .form-control[disabled],
    .form-control[readonly],
    fieldset[disabled] .form-control { cursor: not-allowed; background-color: #eee; opacity: 1; }
    textarea.form-control { height: auto; }
    //文本域
    input[type="search"] { -webkit-appearance: none; }
    input[type="date"],
    input[type="time"],
    input[type="datetime-local"],
    input[type="month"] { line-height: 34px; line-height: 1.42857143 \0; }
    input[type="date"].input-sm,
    input[type="time"].input-sm,
    input[type="datetime-local"].input-sm,
    input[type="month"].input-sm { line-height: 30px; line-height: 1.5 \0; }
    input[type="date"].input-lg,
    input[type="time"].input-lg,
    input[type="datetime-local"].input-lg,
    input[type="month"].input-lg { line-height: 46px; line-height: 1.33 \0; }
    _:-ms-fullscreen,
    :root input[type="date"],
    _:-ms-fullscreen,
    :root input[type="time"],
    _:-ms-fullscreen,
    :root input[type="datetime-local"],
    _:-ms-fullscreen,
    :root input[type="month"] { line-height: 1.42857143; }
    _:-ms-fullscreen.input-sm,
    :root input[type="date"].input-sm,
    _:-ms-fullscreen.input-sm,
    :root input[type="time"].input-sm,
    _:-ms-fullscreen.input-sm,
    :root input[type="datetime-local"].input-sm,
    _:-ms-fullscreen.input-sm,
    :root input[type="month"].input-sm { line-height: 1.5; }
    _:-ms-fullscreen.input-lg,
    :root input[type="date"].input-lg,
    _:-ms-fullscreen.input-lg,
    :root input[type="time"].input-lg,
    _:-ms-fullscreen.input-lg,
    :root input[type="datetime-local"].input-lg,
    _:-ms-fullscreen.input-lg,
    :root input[type="month"].input-lg { line-height: 1.33; }
    //日期控件
    //_:-ms-fullscreen IE 11黑客逆向iOS破解时间输入。
    //:root根目录，IE8不支持
    .form-group { margin-bottom: 15px; }
    .radio,
    .checkbox { position: relative; display: block; margin-top: 10px; margin-bottom: 10px; }
    .radio label,
    .checkbox label { min-height: 20px; padding-left: 20px; margin-bottom: 0; font-weight: normal; cursor: pointer; }
    .radio input[type="radio"],
    .radio-inline input[type="radio"],
    .checkbox input[type="checkbox"],
    .checkbox-inline input[type="checkbox"] { position: absolute; margin-top: 4px \9; margin-left: -20px; }
    .radio + .radio,
    .checkbox + .checkbox { margin-top: -5px; }
    .radio-inline,
    .checkbox-inline { display: inline-block; padding-left: 20px; margin-bottom: 0; font-weight: normal; vertical-align: middle; cursor: pointer; }
    .radio-inline + .radio-inline,
    .checkbox-inline + .checkbox-inline { margin-top: 0; margin-left: 10px; }
    input[type="radio"][disabled],
    input[type="checkbox"][disabled],
    input[type="radio"].disabled,
    input[type="checkbox"].disabled,
    fieldset[disabled] input[type="radio"],
    fieldset[disabled] input[type="checkbox"] { cursor: not-allowed; }
    .radio-inline.disabled,
    .checkbox-inline.disabled,
    fieldset[disabled] .radio-inline,
    fieldset[disabled] .checkbox-inline { cursor: not-allowed; }
    .radio.disabled label,
    .checkbox.disabled label,
    fieldset[disabled] .radio label,
    fieldset[disabled] .checkbox label { cursor: not-allowed; }
    //单选和多选控件
    .form-control-static { padding-top: 7px; padding-bottom: 7px; margin-bottom: 0; }
    .form-control-static.input-lg,
    .form-control-static.input-sm { padding-right: 0; padding-left: 0; }
    .input-sm,
    .form-group-sm .form-control { height: 30px; padding: 5px 10px; font-size: 12px; line-height: 1.5; border-radius: 3px; }
    select.input-sm,
    select.form-group-sm .form-control { height: 30px; line-height: 30px; }
    textarea.input-sm,
    textarea.form-group-sm .form-control,
    select[multiple].input-sm,
    select[multiple].form-group-sm .form-control { height: auto; }
    .input-lg,
    .form-group-lg .form-control { height: 46px; padding: 10px 16px; font-size: 18px; line-height: 1.33; border-radius: 6px; }
    select.input-lg,
    select.form-group-lg .form-control { height: 46px; line-height: 46px; }
    textarea.input-lg,
    textarea.form-group-lg .form-control,
    select[multiple].input-lg,
    select[multiple].form-group-lg .form-control { height: auto; }
    //下拉列表
    .has-feedback { position: relative; }
    .has-feedback .form-control { padding-right: 42.5px; }
    .form-control-feedback { position: absolute; top: 0; right: 0; z-index: 2; display: block; width: 34px; height: 34px; line-height: 34px; text-align: center; pointer-events: none; }
    .input-lg + .form-control-feedback { width: 46px; height: 46px; line-height: 46px; }
    .input-sm + .form-control-feedback { width: 30px; height: 30px; line-height: 30px; }
    .has-success .help-block,
    .has-success .control-label,
    .has-success .radio,
    .has-success .checkbox,
    .has-success .radio-inline,
    .has-success .checkbox-inline,
    .has-success.radio label,
    .has-success.checkbox label,
    .has-success.radio-inline label,
    .has-success.checkbox-inline label { color: #3c763d; }
    .has-success .form-control { border-color: #3c763d; -webkit-box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075); box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075); }
    .has-success .form-control:focus { border-color: #2b542c; -webkit-box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075), 0 0 6px #67b168; box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075), 0 0 6px #67b168; }
    .has-success .input-group-addon { color: #3c763d; background-color: #dff0d8; border-color: #3c763d; }
    .has-success .form-control-feedback { color: #3c763d; }
    .has-warning .help-block,
    .has-warning .control-label,
    .has-warning .radio,
    .has-warning .checkbox,
    .has-warning .radio-inline,
    .has-warning .checkbox-inline,
    .has-warning.radio label,
    .has-warning.checkbox label,
    .has-warning.radio-inline label,
    .has-warning.checkbox-inline label { color: #8a6d3b; }
    .has-warning .form-control { border-color: #8a6d3b; -webkit-box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075); box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075); }
    .has-warning .form-control:focus { border-color: #66512c; -webkit-box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075), 0 0 6px #c0a16b; box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075), 0 0 6px #c0a16b; }
    .has-warning .input-group-addon { color: #8a6d3b; background-color: #fcf8e3; border-color: #8a6d3b; }
    .has-warning .form-control-feedback { color: #8a6d3b; }
    .has-error .help-block,
    .has-error .control-label,
    .has-error .radio,
    .has-error .checkbox,
    .has-error .radio-inline,
    .has-error .checkbox-inline,
    .has-error.radio label,
    .has-error.checkbox label,
    .has-error.radio-inline label,
    .has-error.checkbox-inline label { color: #a94442; }
    .has-error .form-control { border-color: #a94442; -webkit-box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075); box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075); }
    .has-error .form-control:focus { border-color: #843534; -webkit-box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075), 0 0 6px #ce8483; box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075), 0 0 6px #ce8483; }
    .has-error .input-group-addon { color: #a94442; background-color: #f2dede; border-color: #a94442; }
    .has-error .form-control-feedback { color: #a94442; }
    .has-feedback label ~ .form-control-feedback { top: 25px; }
    .has-feedback label.sr-only ~ .form-control-feedback { top: 0; }
    .help-block { display: block; margin-top: 5px; margin-bottom: 10px; color: #737373; }
    //校验状态
    @media (min-width: 768px) { .form-inline .form-group { display: inline-block; margin-bottom: 0; vertical-align: middle; }eckbox-inline { padding-top: 7px; margin-top: 0; margin-bottom: 0; }
    .form-horizontal .radio,
    .form-horizontal .checkbox { min-height: 27px; }
    .form-horizontal .form-group { margin-right: -15px; margin-left: -15px; }
    @media (min-width: 768px) {
      .form-horizontal .control-label {
        padding-top: 7px;
        margin-bottom: 0;
        text-align: right;
      }
    }
    .form-horizontal .has-feedback .form-control-feedback {
      right: 15px;
    }
    @media (min-width: 768px) {
      .form-horizontal .form-group-lg .control-label {
        padding-top: 14.3px;
      }
    }
    @media (min-width: 768px) {
      .form-horizontal .form-group-sm .control-label {
        padding-top: 6px;
      }
    }

### buttons.less ###

按钮样式，编译后对应源码为2782~3171行

.btn { display: inline-block; padding: 6px 12px; margin-bottom: 0; font-size: 14px; font-weight: normal; line-height: 1.42857143; text-align: center; white-space: nowrap; vertical-align: middle; -ms-touch-action: manipulation; touch-action: manipulation; cursor: pointer; -webkit-user-select: none; -moz-user-select: none; -ms-user-select: none; user-select: none; background-image: none; border: 1px solid transparent; border-radius: 4px; }
    .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: #333; text-decoration: none; }
    .btn:active,
    .btn.active { background-image: none; outline: 0; -webkit-box-shadow: inset 0 3px 5px rgba(0, 0, 0, .125); box-shadow: inset 0 3px 5px rgba(0, 0, 0, .125); }
    .btn.disabled,
    .btn[disabled],
    fieldset[disabled] .btn { pointer-events: none; cursor: not-allowed; filter: alpha(opacity=65); -webkit-box-shadow: none; box-shadow: none; opacity: .65; }
    //按钮基本样式
    .btn-default { color: #333; background-color: #fff; border-color: #ccc; }
    .btn-default:hover,
    .btn-default:focus,
    .btn-default.focus,
    .btn-default:active,
    .btn-default.active,
    .open > .dropdown-toggle.btn-default { color: #333; background-color: #e6e6e6; border-color: #adadad; }
    .btn-default:active,
    .btn-default.active,
    .open > .dropdown-toggle.btn-default { background-image: none; }
    .btn-default.disabled,
    .btn-default[disabled],
    fieldset[disabled] .btn-default,
    .btn-default.disabled:hover,
    .btn-default[disabled]:hover,
    fieldset[disabled] .btn-default:hover,
    .btn-default.disabled:focus,
    .btn-default[disabled]:focus,
    fieldset[disabled] .btn-default:focus,
    .btn-default.disabled.focus,
    .btn-default[disabled].focus,
    fieldset[disabled] .btn-default.focus,
    .btn-default.disabled:active,
    .btn-default[disabled]:active,
    fieldset[disabled] .btn-default:active,
    .btn-default.disabled.active,
    .btn-default[disabled].active,
    fieldset[disabled] .btn-default.active { background-color: #fff; border-color: #ccc; }
    .btn-default .badge { color: #fff; background-color: #333; }
    //默认按钮
    .btn-primary { color: #fff; background-color: #428bca; border-color: #357ebd; }
    .btn-primary:hover,
    .btn-primary:focus,
    .btn-primary.focus,
    .btn-primary:active,
    .btn-primary.active,
    .open > .dropdown-toggle.btn-primary { color: #fff; background-color: #3071a9; border-color: #285e8e; }
    .btn-primary:active,
    .btn-primary.active,
    .open > .dropdown-toggle.btn-primary { background-image: none; }
    .btn-primary.disabled,
    .btn-primary[disabled],
    fieldset[disabled] .btn-primary,
    .btn-primary.disabled:hover,
    .btn-primary[disabled]:hover,
    fieldset[disabled] .btn-primary:hover,
    .btn-primary.disabled:focus,
    .btn-primary[disabled]:focus,
    fieldset[disabled] .btn-primary:focus,
    .btn-primary.disabled.focus,
    .btn-primary[disabled].focus,
    fieldset[disabled] .btn-primary.focus,
    .btn-primary.disabled:active,
    .btn-primary[disabled]:active,
    fieldset[disabled] .btn-primary:active,
    .btn-primary.disabled.active,
    .btn-primary[disabled].active,
    fieldset[disabled] .btn-primary.active { background-color: #428bca; border-color: #357ebd; }
    .btn-primary .badge { color: #428bca; background-color: #fff; }
    //原始按钮
    .btn-success { color: #fff; background-color: #5cb85c; border-color: #4cae4c; }
    .btn-success:hover,
    .btn-success:focus,
    .btn-success.focus,
    .btn-success:active,
    .btn-success.active,
    .open > .dropdown-toggle.btn-success { color: #fff; background-color: #449d44; border-color: #398439; }
    .btn-success:active,
    .btn-success.active,
    .open > .dropdown-toggle.btn-success { background-image: none; }
    .btn-success.disabled,
    .btn-success[disabled],
    fieldset[disabled] .btn-success,
    .btn-success.disabled:hover,
    .btn-success[disabled]:hover,
    fieldset[disabled] .btn-success:hover,
    .btn-success.disabled:focus,
    .btn-success[disabled]:focus,
    fieldset[disabled] .btn-success:focus,
    .btn-success.disabled.focus,
    .btn-success[disabled].focus,
    fieldset[disabled] .btn-success.focus,
    .btn-success.disabled:active,
    .btn-success[disabled]:active,
    fieldset[disabled] .btn-success:active,
    .btn-success.disabled.active,
    .btn-success[disabled].active,
    fieldset[disabled] .btn-success.active { background-color: #5cb85c; border-color: #4cae4c; }
    .btn-success .badge { color: #5cb85c; background-color: #fff; }
    //表示成功的按钮
    .btn-info { color: #fff; background-color: #5bc0de; border-color: #46b8da; }
    .btn-info:hover,
    .btn-info:focus,
    .btn-info.focus,
    .btn-info:active,
    .btn-info.active,
    .open > .dropdown-toggle.btn-info { color: #fff; background-color: #31b0d5; border-color: #269abc; }
    .btn-info:active,
    .btn-info.active,
    .open > .dropdown-toggle.btn-info { background-image: none; }
    .btn-info.disabled,
    .btn-info[disabled],
    fieldset[disabled] .btn-info,
    .btn-info.disabled:hover,
    .btn-info[disabled]:hover,
    fieldset[disabled] .btn-info:hover,
    .btn-info.disabled:focus,
    .btn-info[disabled]:focus,
    fieldset[disabled] .btn-info:focus,
    .btn-info.disabled.focus,
    .btn-info[disabled].focus,
    fieldset[disabled] .btn-info.focus,
    .btn-info.disabled:active,
    .btn-info[disabled]:active,
    fieldset[disabled] .btn-info:active,
    .btn-info.disabled.active,
    .btn-info[disabled].active,
    fieldset[disabled] .btn-info.active { background-color: #5bc0de; border-color: #46b8da; }
    .btn-info .badge { color: #5bc0de; background-color: #fff; }
    //提示信息的按钮
    .btn-warning { color: #fff; background-color: #f0ad4e; border-color: #eea236; }
    .btn-warning:hover,
    .btn-warning:focus,
    .btn-warning.focus,
    .btn-warning:active,
    .btn-warning.active,
    .open > .dropdown-toggle.btn-warning { color: #fff; background-color: #ec971f; border-color: #d58512; }
    .btn-warning:active,
    .btn-warning.active,
    .open > .dropdown-toggle.btn-warning { background-image: none; }
    .btn-warning.disabled,
    .btn-warning[disabled],
    fieldset[disabled] .btn-warning,
    .btn-warning.disabled:hover,
    .btn-warning[disabled]:hover,
    fieldset[disabled] .btn-warning:hover,
    .btn-warning.disabled:focus,
    .btn-warning[disabled]:focus,
    fieldset[disabled] .btn-warning:focus,
    .btn-warning.disabled.focus,
    .btn-warning[disabled].focus,
    fieldset[disabled] .btn-warning.focus,
    .btn-warning.disabled:active,
    .btn-warning[disabled]:active,
    fieldset[disabled] .btn-warning:active,
    .btn-warning.disabled.active,
    .btn-warning[disabled].active,
    fieldset[disabled] .btn-warning.active { background-color: #f0ad4e; border-color: #eea236; }
    .btn-warning .badge { color: #f0ad4e; background-color: #fff; }
    //表示警告按钮
    .btn-danger { color: #fff; background-color: #d9534f; border-color: #d43f3a; }
    .btn-danger:hover,
    .btn-danger:focus,
    .btn-danger.focus,
    .btn-danger:active,
    .btn-danger.active,
    .open > .dropdown-toggle.btn-danger { color: #fff; background-color: #c9302c; border-color: #ac2925; }
    .btn-danger:active,
    .btn-danger.active,
    .open > .dropdown-toggle.btn-danger { background-image: none; }
    .btn-danger.disabled,
    .btn-danger[disabled],
    fieldset[disabled] .btn-danger,
    .btn-danger.disabled:hover,
    .btn-danger[disabled]:hover,
    fieldset[disabled] .btn-danger:hover,
    .btn-danger.disabled:focus,
    .btn-danger[disabled]:focus,
    fieldset[disabled] .btn-danger:focus,
    .btn-danger.disabled.focus,
    .btn-danger[disabled].focus,
    fieldset[disabled] .btn-danger.focus,
    .btn-danger.disabled:active,
    .btn-danger[disabled]:active,
    fieldset[disabled] .btn-danger:active,
    .btn-danger.disabled.active,
    .btn-danger[disabled].active,
    fieldset[disabled] .btn-danger.active { background-color: #d9534f; border-color: #d43f3a; }
    .btn-danger .badge { color: #d9534f; background-color: #fff; }
    //表示危险按钮
    .btn-link { font-weight: normal; color: #428bca; border-radius: 0; }
    .btn-link,
    .btn-link:active,
    .btn-link.active,
    .btn-link[disabled],
    fieldset[disabled] .btn-link { background-color: transparent; -webkit-box-shadow: none; box-shadow: none; }
    .btn-link,
    .btn-link:hover,
    .btn-link:focus,
    .btn-link:active { border-color: transparent; }
    .btn-link:hover,
    .btn-link:focus { color: #2a6496; text-decoration: underline; background-color: transparent; }
    .btn-link[disabled]:hover,
    fieldset[disabled] .btn-link:hover,
    .btn-link[disabled]:focus,
    fieldset[disabled] .btn-link:focus { color: #777; text-decoration: none; }
    //链接按钮
    .btn-lg,
    .btn-group-lg > .btn { padding: 10px 16px; font-size: 18px; line-height: 1.33; border-radius: 6px; }
    .btn-sm,
    .btn-group-sm > .btn { padding: 5px 10px; font-size: 12px; line-height: 1.5; border-radius: 3px; }
    .btn-xs,
    .btn-group-xs > .btn { padding: 1px 5px; font-size: 12px; line-height: 1.5; border-radius: 3px; }
    //按钮尺寸
    .btn-block { display: block; width: 100%; }
    .btn-block + .btn-block { margin-top: 5px; }
    input[type="submit"].btn-block,
    input[type="reset"].btn-block,
    input[type="button"].btn-block { width: 100%; }

转载：[http://www.cnblogs.com/jesse131/p/5988125.html][http_www.cnblogs.com_jesse131_p_5988125.html]

[http_www.cnblogs.com_jesse131_p_5988125.html]: http://www.cnblogs.com/jesse131/p/5988125.html