jakchen 前端工程师

开始使用bootstrap(3)-导航栏

2017-12-17
jakchen
bootstrap

导航条是在应用或网站中作为导航页头的响应式基础组件。它们在移动设备上可以折叠（并且可开可关），且在视口（viewport）宽度增加时逐渐变为水平展开模式。

在 Bootstrap 导航栏的核心中，导航栏包括了站点名称和基本的导航定义样式。

两端对齐的导航条导航链接已经被弃用了。

1.默认导航栏

创建一个默认的导航栏的步骤如下：

  1. 向 <nav> 标签添加 class .navbar、.navbar-default。
  2. 向<nav>元素添加 role="navigation"，有助于增加可访问性。
  3. 向 <nav>里的<div> 元素添加一个标题 class .navbar-header，内部包含了带有 class .navbar-brand 的 <a> 元素。这会让文本看起来更大一号。
  4. 为了向导航栏添加链接，只需要简单地添加带有 class .nav、.navbar-nav 的无序列表ul即可。

PS：role的作用是描述一个非标准的tag的实际作用。比如用div做button，那么设置div 的 role=”button”，辅助工具就可以认出这实际上是个button。

代码如下：

<h1>默认导航栏</h1>
<nav class="navbar navbar-default" role="navigation">
  <div class="navbar-header">
    <a href="#" class="navbar-brand">导航栏</a>
  </div>

  <ul class="nav navbar-nav">
    <li class="active"><a href="#">iOS</a></li>
    <li><a href="#">SVN</a></li>
    <li class="dropdown">
        <a href="#" class="dropdown-toggle" data-toggle="dropdown">
            Java
            <b class="caret"></b>
        </a>
        <ul class="dropdown-menu">
            <li><a href="#">jmeter</a></li>
            <li><a href="#">EJB</a></li>
            <li><a href="#">Jasper Report</a></li>
            <li class="divider"></li>
            <li><a href="#">分离的链接</a></li>
            <li class="divider"></li>
            <li><a href="#">另一个分离的链接</a></li>
        </ul>
    </li>
  </ul>

</nav>

效果如下： 默认导航栏

.navbar、.navbar-default、.navbar-brand 类的CSS代码如下：

.navbar {
  position: relative;
  min-height: 50px;
  margin-bottom: 20px;
  border: 1px solid transparent;
}
@media (min-width: 768px) {
  .navbar {
    border-radius: 4px;
  }
}

.navbar-default {
  background-color: #f8f8f8;
  border-color: #e7e7e7;
}

.navbar-default .navbar-brand {
  color: #777;
}
.navbar-default .navbar-brand:hover,
.navbar-default .navbar-brand:focus {
  color: #5e5e5e;
  background-color: transparent;
}

.navbar-default .navbar-nav > li > a {
  color: #777;
}
.navbar-default .navbar-nav > li > a:hover,
.navbar-default .navbar-nav > li > a:focus {
  color: #333;
  background-color: transparent;
}

2.响应式导航栏

  1. 为了给导航栏添加响应式特性，您要折叠的内容必须包裹在带有 class .collapse、.navbar-collapse 的 <div> 中。 （折叠起来的导航栏实际上是一个带有 class .navbar-toggle 及两个 data- 元素的按钮。 第一个是 data-toggle，用于告诉 JavaScript 需要对按钮做什么， 第二个是 data-target，指示要切换到哪一个元素。）
  2. 三个带有 class .icon-bar 的 创建所谓的汉堡按钮。

这些会切换为 .navbar-collapse <div> 中的元素。

PS：为了实现以上这些功能，您必须包含 Bootstrap 折叠（Collapse）插件。

代码如下：

<h1>响应式导航栏</h1>
<nav class="navbar navbar-default" role="navigation">

  <div class="navbar-header">
      <button type="button" class="navbar-toggle" data-toggle="collapse"
              data-target="#example-navbar-collapse">
          <span class="sr-only">切换导航</span>
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="#">菜鸟教程</a>
  </div>

  <div class="collapse navbar-collapse" id="example-navbar-collapse">
      <ul class="nav navbar-nav">
          <li class="active"><a href="#">iOS</a></li>
          <li><a href="#">SVN</a></li>
          <li class="dropdown">
              <a href="#" class="dropdown-toggle" data-toggle="dropdown">
                  Java <b class="caret"></b>
              </a>
              <ul class="dropdown-menu">
                  <li><a href="#">jmeter</a></li>
                  <li><a href="#">EJB</a></li>
                  <li><a href="#">Jasper Report</a></li>
                  <li class="divider"></li>
                  <li><a href="#">分离的链接</a></li>
                  <li class="divider"></li>
                  <li><a href="#">另一个分离的链接</a></li>
              </ul>
          </li>
      </ul>
  </div>

</nav>

效果如下：
响应式导航栏

.collapse、.navbar-collapse 类的CSS代码如下：

.collapse {
  display: none;
}

.navbar-collapse {
  padding-right: 15px;
  padding-left: 15px;
  overflow-x: visible;
  -webkit-overflow-scrolling: touch;
  border-top: 1px solid transparent;
  -webkit-box-shadow: inset 0 1px 0 rgba(255, 255, 255, .1);
          box-shadow: inset 0 1px 0 rgba(255, 255, 255, .1);
}
@media (min-width: 768px) {
  .navbar-collapse {
    width: auto;
    border-top: 0;
    -webkit-box-shadow: none;
            box-shadow: none;
  }
  .navbar-collapse.collapse {
    display: block !important;
    height: auto !important;
    padding-bottom: 0;
    overflow: visible !important;
  }
}

.container > .navbar-header,
.container-fluid > .navbar-header,
.container > .navbar-collapse,
.container-fluid > .navbar-collapse {
  margin-right: -15px;
  margin-left: -15px;
}

@media (min-width: 768px) {
  .container > .navbar-header,
  .container-fluid > .navbar-header,
  .container > .navbar-collapse,
  .container-fluid > .navbar-collapse {
    margin-right: 0;
    margin-left: 0;
  }
}

.icon-bar类的CSS代码如下：

.navbar-toggle .icon-bar {
  display: block;
  width: 22px;
  height: 2px;
  border-radius: 1px;
}
.navbar-toggle .icon-bar + .icon-bar {
  margin-top: 4px;
}

.navbar-default .navbar-toggle .icon-bar {
  background-color: #888;
}

导航栏中的表单

  1. 导航栏中的表单使用 .navbar-form class。 （这确保了表单适当的垂直对齐和在较窄的视口中折叠的行为。）
  2. 使用对齐方式.navbar-left、.navbar-right选项来决定导航栏中的内容放置在哪里。

代码如下：

<nav class="navbar navbar-default" role="navigation">
    <div class="navbar-header">
        <a class="navbar-brand" href="#">菜鸟教程</a>
    </div>
    <form class="navbar-form navbar-left" role="search">
        <div class="form-group">
            <input type="text" class="form-control" placeholder="Search">
        </div>
        <button type="submit" class="btn btn-default">提交</button>
    </form>
</nav>

效果如下： 导航栏中的表单

.navbar-form 类的CSS代码如下：

.navbar-form {
  padding: 10px 15px;
  margin-top: 8px;
  margin-right: -15px;
  margin-bottom: 8px;
  margin-left: -15px;
  border-top: 1px solid transparent;
  border-bottom: 1px solid transparent;
  -webkit-box-shadow: inset 0 1px 0 rgba(255, 255, 255, .1), 0 1px 0 rgba(255, 255, 255, .1);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .1), 0 1px 0 rgba(255, 255, 255, .1);
}

@media (min-width: 768px) {
  .navbar-form {
    width: auto;
    padding-top: 0;
    padding-bottom: 0;
    margin-right: 0;
    margin-left: 0;
    border: 0;
    -webkit-box-shadow: none;
            box-shadow: none;
  }
}

.navbar-left、.navbar-right类的CSS代码如下：

@media (min-width: 768px) {
  .navbar-left {
    float: left !important;
  }
  .navbar-right {
    float: right !important;
    margin-right: -15px;
  }
  .navbar-right ~ .navbar-right {
    margin-right: 0;
  }
}

导航栏中的按钮

  1. 可以使用 class .navbar-btn 向不在 <form> 中的 <button> 元素添加按钮，按钮在导航栏上垂直居中。

.navbar-btn可被使用在 <a> 和 <input> 元素上。

PS：不要在 .navbar-nav 内的 <a> 元素上使用 .navbar-btn，因为它不是标准的 button class

代码如下：

<nav class="navbar navbar-default" role="navigation">
    <div class="navbar-header">
        <a class="navbar-brand" href="#">菜鸟教程</a>
    </div>
    <div>
        <form class="navbar-form navbar-left" role="search">
            <div class="form-group">
                <input type="text" class="form-control" placeholder="Search">
            </div>
            <button type="submit" class="btn btn-default">提交按钮</button>
        </form>
        <button type="button" class="btn btn-default navbar-btn">
            导航栏按钮
        </button>
    </div>
</nav>

效果如下： 导航栏中的按钮

.navbar-btn类的CSS代码如下：

.navbar-btn {
  margin-top: 8px;
  margin-bottom: 8px;
}

.navbar-btn.btn-sm {
  margin-top: 10px;
  margin-bottom: 10px;
}
.navbar-btn.btn-xs {
  margin-top: 14px;
  margin-bottom: 14px;
}

导航栏中的文本

  1. 如果需要在导航中包含文本字符串，请使用 class .navbar-text。

这通常与 <p> 标签一起使用，确保适当的前导和颜色。

代码如下：

<nav class="navbar navbar-default" role="navigation">
    <div class="navbar-header">
        <a class="navbar-brand" href="#">菜鸟教程</a>
    </div>
    <p class="navbar-text">Runoob 用户登录</p>
</nav>

效果如下： 导航栏中的文本

.navbar-text类的CSS代码如下：

.navbar-text {
  margin-top: 15px;
  margin-bottom: 15px;
}
@media (min-width: 768px) {
  .navbar-text {
    float: left;
    margin-right: 15px;
    margin-left: 15px;
  }
}

.navbar-default .navbar-text {
  color: #777;
}

结合图标的导航链接

  1. 想在常规的导航栏导航组件内使用图标，请使用 class glyphicon glyphicon-* 来设置图标

代码如下：

<nav class="navbar navbar-default" role="navigation">
  <div class="navbar-header">
      <a class="navbar-brand" href="#">菜鸟教程</a>
  </div>
  <ul class="nav navbar-nav navbar-right">
      <li><a href="#"><span class="glyphicon glyphicon-user"></span> 注册</a></li>
      <li><a href="#"><span class="glyphicon glyphicon-log-in"></span> 登录</a></li>
  </ul>
</nav>

效果如下： 结合图标的导航链接

查看更多图标代码

glyphicon glyphicon-*类的CSS代码如下：

.glyphicon {
  position: relative;
  top: 1px;
  display: inline-block;
  font-family: 'Glyphicons Halflings';
  font-style: normal;
  font-weight: normal;
  line-height: 1;

  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.glyphicon-asterisk:before {
  content: "\002a";
}
.glyphicon-plus:before {
  content: "\002b";
}
.glyphicon-euro:before,
.glyphicon-eur:before {
  content: "\20ac";
}
.glyphicon-minus:before {
  content: "\2212";
}
.glyphicon-cloud:before {
  content: "\2601";
}
.glyphicon-envelope:before {
  content: "\2709";
}
.glyphicon-pencil:before {
  content: "\270f";
}
.glyphicon-glass:before {
  content: "\e001";
}
.glyphicon-music:before {
  content: "\e002";
}
.glyphicon-search:before {
  content: "\e003";
}
.glyphicon-heart:before {
  content: "\e005";
}
.glyphicon-star:before {
  content: "\e006";
}
.glyphicon-star-empty:before {
  content: "\e007";
}
.glyphicon-user:before {
  content: "\e008";
}
.glyphicon-film:before {
  content: "\e009";
}
.glyphicon-th-large:before {
  content: "\e010";
}
.glyphicon-th:before {
  content: "\e011";
}
.glyphicon-th-list:before {
  content: "\e012";
}
.glyphicon-ok:before {
  content: "\e013";
}
.glyphicon-remove:before {
  content: "\e014";
}
.glyphicon-zoom-in:before {
  content: "\e015";
}
.glyphicon-zoom-out:before {
  content: "\e016";
}
.glyphicon-off:before {
  content: "\e017";
}
.glyphicon-signal:before {
  content: "\e018";
}
.glyphicon-cog:before {
  content: "\e019";
}
.glyphicon-trash:before {
  content: "\e020";
}
.glyphicon-home:before {
  content: "\e021";
}
.glyphicon-file:before {
  content: "\e022";
}
.glyphicon-time:before {
  content: "\e023";
}
.glyphicon-road:before {
  content: "\e024";
}
.glyphicon-download-alt:before {
  content: "\e025";
}
.glyphicon-download:before {
  content: "\e026";
}
.glyphicon-upload:before {
  content: "\e027";
}
.glyphicon-inbox:before {
  content: "\e028";
}
.glyphicon-play-circle:before {
  content: "\e029";
}
.glyphicon-repeat:before {
  content: "\e030";
}
.glyphicon-refresh:before {
  content: "\e031";
}
.glyphicon-list-alt:before {
  content: "\e032";
}
.glyphicon-lock:before {
  content: "\e033";
}
.glyphicon-flag:before {
  content: "\e034";
}
.glyphicon-headphones:before {
  content: "\e035";
}
.glyphicon-volume-off:before {
  content: "\e036";
}
.glyphicon-volume-down:before {
  content: "\e037";
}
.glyphicon-volume-up:before {
  content: "\e038";
}
.glyphicon-qrcode:before {
  content: "\e039";
}
.glyphicon-barcode:before {
  content: "\e040";
}
.glyphicon-tag:before {
  content: "\e041";
}
.glyphicon-tags:before {
  content: "\e042";
}
.glyphicon-book:before {
  content: "\e043";
}
.glyphicon-bookmark:before {
  content: "\e044";
}
.glyphicon-print:before {
  content: "\e045";
}
.glyphicon-camera:before {
  content: "\e046";
}
.glyphicon-font:before {
  content: "\e047";
}
.glyphicon-bold:before {
  content: "\e048";
}
.glyphicon-italic:before {
  content: "\e049";
}
.glyphicon-text-height:before {
  content: "\e050";
}
.glyphicon-text-width:before {
  content: "\e051";
}
.glyphicon-align-left:before {
  content: "\e052";
}
.glyphicon-align-center:before {
  content: "\e053";
}
.glyphicon-align-right:before {
  content: "\e054";
}
.glyphicon-align-justify:before {
  content: "\e055";
}
.glyphicon-list:before {
  content: "\e056";
}
.glyphicon-indent-left:before {
  content: "\e057";
}
.glyphicon-indent-right:before {
  content: "\e058";
}
.glyphicon-facetime-video:before {
  content: "\e059";
}
.glyphicon-picture:before {
  content: "\e060";
}
.glyphicon-map-marker:before {
  content: "\e062";
}
.glyphicon-adjust:before {
  content: "\e063";
}
.glyphicon-tint:before {
  content: "\e064";
}
.glyphicon-edit:before {
  content: "\e065";
}
.glyphicon-share:before {
  content: "\e066";
}
.glyphicon-check:before {
  content: "\e067";
}
.glyphicon-move:before {
  content: "\e068";
}
.glyphicon-step-backward:before {
  content: "\e069";
}
.glyphicon-fast-backward:before {
  content: "\e070";
}
.glyphicon-backward:before {
  content: "\e071";
}
.glyphicon-play:before {
  content: "\e072";
}
.glyphicon-pause:before {
  content: "\e073";
}
.glyphicon-stop:before {
  content: "\e074";
}
.glyphicon-forward:before {
  content: "\e075";
}
.glyphicon-fast-forward:before {
  content: "\e076";
}
.glyphicon-step-forward:before {
  content: "\e077";
}
.glyphicon-eject:before {
  content: "\e078";
}
.glyphicon-chevron-left:before {
  content: "\e079";
}
.glyphicon-chevron-right:before {
  content: "\e080";
}
.glyphicon-plus-sign:before {
  content: "\e081";
}
.glyphicon-minus-sign:before {
  content: "\e082";
}
.glyphicon-remove-sign:before {
  content: "\e083";
}
.glyphicon-ok-sign:before {
  content: "\e084";
}
.glyphicon-question-sign:before {
  content: "\e085";
}
.glyphicon-info-sign:before {
  content: "\e086";
}
.glyphicon-screenshot:before {
  content: "\e087";
}
.glyphicon-remove-circle:before {
  content: "\e088";
}
.glyphicon-ok-circle:before {
  content: "\e089";
}
.glyphicon-ban-circle:before {
  content: "\e090";
}
.glyphicon-arrow-left:before {
  content: "\e091";
}
.glyphicon-arrow-right:before {
  content: "\e092";
}
.glyphicon-arrow-up:before {
  content: "\e093";
}
.glyphicon-arrow-down:before {
  content: "\e094";
}
.glyphicon-share-alt:before {
  content: "\e095";
}
.glyphicon-resize-full:before {
  content: "\e096";
}
.glyphicon-resize-small:before {
  content: "\e097";
}
.glyphicon-exclamation-sign:before {
  content: "\e101";
}
.glyphicon-gift:before {
  content: "\e102";
}
.glyphicon-leaf:before {
  content: "\e103";
}
.glyphicon-fire:before {
  content: "\e104";
}
.glyphicon-eye-open:before {
  content: "\e105";
}
.glyphicon-eye-close:before {
  content: "\e106";
}
.glyphicon-warning-sign:before {
  content: "\e107";
}
.glyphicon-plane:before {
  content: "\e108";
}
.glyphicon-calendar:before {
  content: "\e109";
}
.glyphicon-random:before {
  content: "\e110";
}
.glyphicon-comment:before {
  content: "\e111";
}
.glyphicon-magnet:before {
  content: "\e112";
}
.glyphicon-chevron-up:before {
  content: "\e113";
}
.glyphicon-chevron-down:before {
  content: "\e114";
}
.glyphicon-retweet:before {
  content: "\e115";
}
.glyphicon-shopping-cart:before {
  content: "\e116";
}
.glyphicon-folder-close:before {
  content: "\e117";
}
.glyphicon-folder-open:before {
  content: "\e118";
}
.glyphicon-resize-vertical:before {
  content: "\e119";
}
.glyphicon-resize-horizontal:before {
  content: "\e120";
}
.glyphicon-hdd:before {
  content: "\e121";
}
.glyphicon-bullhorn:before {
  content: "\e122";
}
.glyphicon-bell:before {
  content: "\e123";
}
.glyphicon-certificate:before {
  content: "\e124";
}
.glyphicon-thumbs-up:before {
  content: "\e125";
}
.glyphicon-thumbs-down:before {
  content: "\e126";
}
.glyphicon-hand-right:before {
  content: "\e127";
}
.glyphicon-hand-left:before {
  content: "\e128";
}
.glyphicon-hand-up:before {
  content: "\e129";
}
.glyphicon-hand-down:before {
  content: "\e130";
}
.glyphicon-circle-arrow-right:before {
  content: "\e131";
}
.glyphicon-circle-arrow-left:before {
  content: "\e132";
}
.glyphicon-circle-arrow-up:before {
  content: "\e133";
}
.glyphicon-circle-arrow-down:before {
  content: "\e134";
}
.glyphicon-globe:before {
  content: "\e135";
}
.glyphicon-wrench:before {
  content: "\e136";
}
.glyphicon-tasks:before {
  content: "\e137";
}
.glyphicon-filter:before {
  content: "\e138";
}
.glyphicon-briefcase:before {
  content: "\e139";
}
.glyphicon-fullscreen:before {
  content: "\e140";
}
.glyphicon-dashboard:before {
  content: "\e141";
}
.glyphicon-paperclip:before {
  content: "\e142";
}
.glyphicon-heart-empty:before {
  content: "\e143";
}
.glyphicon-link:before {
  content: "\e144";
}
.glyphicon-phone:before {
  content: "\e145";
}
.glyphicon-pushpin:before {
  content: "\e146";
}
.glyphicon-usd:before {
  content: "\e148";
}
.glyphicon-gbp:before {
  content: "\e149";
}
.glyphicon-sort:before {
  content: "\e150";
}
.glyphicon-sort-by-alphabet:before {
  content: "\e151";
}
.glyphicon-sort-by-alphabet-alt:before {
  content: "\e152";
}
.glyphicon-sort-by-order:before {
  content: "\e153";
}
.glyphicon-sort-by-order-alt:before {
  content: "\e154";
}
.glyphicon-sort-by-attributes:before {
  content: "\e155";
}
.glyphicon-sort-by-attributes-alt:before {
  content: "\e156";
}
.glyphicon-unchecked:before {
  content: "\e157";
}
.glyphicon-expand:before {
  content: "\e158";
}
.glyphicon-collapse-down:before {
  content: "\e159";
}
.glyphicon-collapse-up:before {
  content: "\e160";
}
.glyphicon-log-in:before {
  content: "\e161";
}
.glyphicon-flash:before {
  content: "\e162";
}
.glyphicon-log-out:before {
  content: "\e163";
}
.glyphicon-new-window:before {
  content: "\e164";
}
.glyphicon-record:before {
  content: "\e165";
}
.glyphicon-save:before {
  content: "\e166";
}
.glyphicon-open:before {
  content: "\e167";
}
.glyphicon-saved:before {
  content: "\e168";
}
.glyphicon-import:before {
  content: "\e169";
}
.glyphicon-export:before {
  content: "\e170";
}
.glyphicon-send:before {
  content: "\e171";
}
.glyphicon-floppy-disk:before {
  content: "\e172";
}
.glyphicon-floppy-saved:before {
  content: "\e173";
}
.glyphicon-floppy-remove:before {
  content: "\e174";
}
.glyphicon-floppy-save:before {
  content: "\e175";
}
.glyphicon-floppy-open:before {
  content: "\e176";
}
.glyphicon-credit-card:before {
  content: "\e177";
}
.glyphicon-transfer:before {
  content: "\e178";
}
.glyphicon-cutlery:before {
  content: "\e179";
}
.glyphicon-header:before {
  content: "\e180";
}
.glyphicon-compressed:before {
  content: "\e181";
}
.glyphicon-earphone:before {
  content: "\e182";
}
.glyphicon-phone-alt:before {
  content: "\e183";
}
.glyphicon-tower:before {
  content: "\e184";
}
.glyphicon-stats:before {
  content: "\e185";
}
.glyphicon-sd-video:before {
  content: "\e186";
}
.glyphicon-hd-video:before {
  content: "\e187";
}
.glyphicon-subtitles:before {
  content: "\e188";
}
.glyphicon-sound-stereo:before {
  content: "\e189";
}
.glyphicon-sound-dolby:before {
  content: "\e190";
}
.glyphicon-sound-5-1:before {
  content: "\e191";
}
.glyphicon-sound-6-1:before {
  content: "\e192";
}
.glyphicon-sound-7-1:before {
  content: "\e193";
}
.glyphicon-copyright-mark:before {
  content: "\e194";
}
.glyphicon-registration-mark:before {
  content: "\e195";
}
.glyphicon-cloud-download:before {
  content: "\e197";
}
.glyphicon-cloud-upload:before {
  content: "\e198";
}
.glyphicon-tree-conifer:before {
  content: "\e199";
}
.glyphicon-tree-deciduous:before {
  content: "\e200";
}
.glyphicon-cd:before {
  content: "\e201";
}
.glyphicon-save-file:before {
  content: "\e202";
}
.glyphicon-open-file:before {
  content: "\e203";
}
.glyphicon-level-up:before {
  content: "\e204";
}
.glyphicon-copy:before {
  content: "\e205";
}
.glyphicon-paste:before {
  content: "\e206";
}
.glyphicon-alert:before {
  content: "\e209";
}
.glyphicon-equalizer:before {
  content: "\e210";
}
.glyphicon-king:before {
  content: "\e211";
}
.glyphicon-queen:before {
  content: "\e212";
}
.glyphicon-pawn:before {
  content: "\e213";
}
.glyphicon-bishop:before {
  content: "\e214";
}
.glyphicon-knight:before {
  content: "\e215";
}
.glyphicon-baby-formula:before {
  content: "\e216";
}
.glyphicon-tent:before {
  content: "\26fa";
}
.glyphicon-blackboard:before {
  content: "\e218";
}
.glyphicon-bed:before {
  content: "\e219";
}
.glyphicon-apple:before {
  content: "\f8ff";
}
.glyphicon-erase:before {
  content: "\e221";
}
.glyphicon-hourglass:before {
  content: "\231b";
}
.glyphicon-lamp:before {
  content: "\e223";
}
.glyphicon-duplicate:before {
  content: "\e224";
}
.glyphicon-piggy-bank:before {
  content: "\e225";
}
.glyphicon-scissors:before {
  content: "\e226";
}
.glyphicon-bitcoin:before {
  content: "\e227";
}
.glyphicon-btc:before {
  content: "\e227";
}
.glyphicon-xbt:before {
  content: "\e227";
}
.glyphicon-yen:before {
  content: "\00a5";
}
.glyphicon-jpy:before {
  content: "\00a5";
}
.glyphicon-ruble:before {
  content: "\20bd";
}
.glyphicon-rub:before {
  content: "\20bd";
}
.glyphicon-scale:before {
  content: "\e230";
}
.glyphicon-ice-lolly:before {
  content: "\e231";
}
.glyphicon-ice-lolly-tasted:before {
  content: "\e232";
}
.glyphicon-education:before {
  content: "\e233";
}
.glyphicon-option-horizontal:before {
  content: "\e234";
}
.glyphicon-option-vertical:before {
  content: "\e235";
}
.glyphicon-menu-hamburger:before {
  content: "\e236";
}
.glyphicon-modal-window:before {
  content: "\e237";
}
.glyphicon-oil:before {
  content: "\e238";
}
.glyphicon-grain:before {
  content: "\e239";
}
.glyphicon-sunglasses:before {
  content: "\e240";
}
.glyphicon-text-size:before {
  content: "\e241";
}
.glyphicon-text-color:before {
  content: "\e242";
}
.glyphicon-text-background:before {
  content: "\e243";
}
.glyphicon-object-align-top:before {
  content: "\e244";
}
.glyphicon-object-align-bottom:before {
  content: "\e245";
}
.glyphicon-object-align-horizontal:before {
  content: "\e246";
}
.glyphicon-object-align-left:before {
  content: "\e247";
}
.glyphicon-object-align-vertical:before {
  content: "\e248";
}
.glyphicon-object-align-right:before {
  content: "\e249";
}
.glyphicon-triangle-right:before {
  content: "\e250";
}
.glyphicon-triangle-left:before {
  content: "\e251";
}
.glyphicon-triangle-bottom:before {
  content: "\e252";
}
.glyphicon-triangle-top:before {
  content: "\e253";
}
.glyphicon-console:before {
  content: "\e254";
}
.glyphicon-superscript:before {
  content: "\e255";
}
.glyphicon-subscript:before {
  content: "\e256";
}
.glyphicon-menu-left:before {
  content: "\e257";
}
.glyphicon-menu-right:before {
  content: "\e258";
}
.glyphicon-menu-down:before {
  content: "\e259";
}
.glyphicon-menu-up:before {
  content: "\e260";
}

组件对齐方式

  1. 可以使用实用工具 class .navbar-left 或 .navbar-right 向左或向右对齐导航栏中的 导航链接、表单、按钮或文本 这些组件。

这两个 class 都会在指定的方向上添加 CSS 浮动。

代码如下：

<h1>结合图标的导航链接</h1>
<nav class="navbar navbar-default" role="navigation">
  <div class="navbar-header">
      <a class="navbar-brand" href="#">菜鸟教程</a>
  </div>
  <div>
    <!--向左对齐-->
    <ul class="nav navbar-nav navbar-left">
        <li class="dropdown">
            <a href="#" class="dropdown-toggle" data-toggle="dropdown">
                Java
                <b class="caret"></b>
            </a>
            <ul class="dropdown-menu">
                <li><a href="#">jmeter</a></li>
                <li><a href="#">EJB</a></li>
                <li><a href="#">Jasper Report</a></li>
                <li class="divider"></li>
                <li><a href="#">分离的链接</a></li>
                <li class="divider"></li>
                <li><a href="#">另一个分离的链接</a></li>
            </ul>
        </li>
    </ul>
    <form class="navbar-form navbar-left" role="search">
        <button type="submit" class="btn btn-default">
            向左对齐-提交按钮
        </button>
    </form>
    <p class="navbar-text navbar-left">向左对齐-文本</p>
    <!--向右对齐-->
    <ul class="nav navbar-nav navbar-right">
        <li class="dropdown">
            <a href="#" class="dropdown-toggle" data-toggle="dropdown">
                Java <b class="caret"></b>
            </a>
            <ul class="dropdown-menu">
                <li><a href="#">jmeter</a></li>
                <li><a href="#">EJB</a></li>
                <li><a href="#">Jasper Report</a></li>
                <li class="divider"></li>
                <li><a href="#">分离的链接</a></li>
                <li class="divider"></li>
                <li><a href="#">另一个分离的链接</a></li>
            </ul>
        </li>
    </ul>
    <form class="navbar-form navbar-right" role="search">
        <button type="submit" class="btn btn-default">
            向右对齐-提交按钮
        </button>
    </form>
    <p class="navbar-text navbar-right">向右对齐-文本</p>
  </div>
</nav>

效果如下： 组件对齐方式

.navbar-left、.navbar-right类的CSS代码如下：

@media (min-width: 768px) {
  .navbar-left {
    float: left !important;
  }
  .navbar-right {
    float: right !important;
    margin-right: -15px;
  }
  .navbar-right ~ .navbar-right {
    margin-right: 0;
  }
}

@media (min-width: 768px) {
  .navbar-right .dropdown-menu {
    right: 0;
    left: auto;
  }
  .navbar-right .dropdown-menu-left {
    right: auto;
    left: 0;
  }
}

固定到顶部

Bootstrap 导航栏可以动态定位。默认情况下，它是块级元素， 它是基于在 HTML 中放置的位置定位的。 通过一些帮助器类，您可以把它放置在页面的顶部或者底部， 或者您可以让它成为随着页面一起滚动的静态导航栏。

  1. 如果想要让导航栏固定在页面的顶部，请向带 .navbar class 的<nav>添加 class .navbar-fixed-top

代码如下：

<nav class="navbar navbar-default navbar-fixed-top" role="navigation">
    <div class="navbar-header">
        <a class="navbar-brand" href="#">菜鸟教程</a>
    </div>
    <div>
        <ul class="nav navbar-nav">
            <li class="active"><a href="#">iOS</a></li>
            <li><a href="#">SVN</a></li>
            <li class="dropdown">
                <a href="#" class="dropdown-toggle" data-toggle="dropdown">
                    Java <b class="caret"></b>
                </a>
                <ul class="dropdown-menu">
                    <li><a href="#">jmeter</a></li>
                    <li><a href="#">EJB</a></li>
                    <li><a href="#">Jasper Report</a></li>
                    <li class="divider"></li>
                    <li><a href="#">分离的链接</a></li>
                    <li class="divider"></li>
                    <li><a href="#">另一个分离的链接</a></li>
                </ul>
            </li>
        </ul>
    </div>
</nav>

效果如下： 固定到顶部

.navbar-fixed-top类的CSS代码如下：

@media (min-width: 768px) {
  .navbar-fixed-top .navbar-collapse,
  .navbar-static-top .navbar-collapse,
  .navbar-fixed-bottom .navbar-collapse {
    padding-right: 0;
    padding-left: 0;
  }
}
.navbar-fixed-top .navbar-collapse,
.navbar-fixed-bottom .navbar-collapse {
  max-height: 340px;
}

@media (max-device-width: 480px) and (orientation: landscape) {
  .navbar-fixed-top .navbar-collapse,
  .navbar-fixed-bottom .navbar-collapse {
    max-height: 200px;
  }
}

.navbar-fixed-top,
.navbar-fixed-bottom {
  position: fixed;
  right: 0;
  left: 0;
  z-index: 1030;
}
@media (min-width: 768px) {
  .navbar-fixed-top,
  .navbar-fixed-bottom {
    border-radius: 0;
  }
}@media (min-width: 768px) {
  .navbar-fixed-top,
  .navbar-fixed-bottom {
    border-radius: 0;
  }
}
.navbar-fixed-top {
  top: 0;
  border-width: 0 0 1px;
}

固定到底部

  1. 如果想要让导航栏固定在页面的底部，请向 .navbar class 添加 class .navbar-fixed-bottom

代码如下：

<nav class="navbar navbar-default navbar-fixed-bottom" role="navigation">
    <div class="navbar-header">
        <a class="navbar-brand" href="#">菜鸟教程</a>
    </div>
    <div>
        <ul class="nav navbar-nav">
            <li class="active"><a href="#">iOS</a></li>
            <li><a href="#">SVN</a></li>
            <li class="dropdown">
                <a href="#" class="dropdown-toggle" data-toggle="dropdown">
                    Java <b class="caret"></b>
                </a>
                <ul class="dropdown-menu">
                    <li><a href="#">jmeter</a></li>
                    <li><a href="#">EJB</a></li>
                    <li><a href="#">Jasper Report</a></li>
                    <li class="divider"></li>
                    <li><a href="#">分离的链接</a></li>
                    <li class="divider"></li>
                    <li><a href="#">另一个分离的链接</a></li>
                </ul>
            </li>
        </ul>
    </div>
</nav>

效果如下： 固定到底部

.navbar-fixed-bottom类的CSS代码如下：

.navbar-fixed-bottom .dropdown .caret {
  content: "";
  border-top: 0;
  border-bottom: 4px dashed;
  border-bottom: 4px solid \9;
}
.dropup .dropdown-menu,
.navbar-fixed-bottom .dropdown .dropdown-menu {
  top: auto;
  bottom: 100%;
  margin-bottom: 2px;
}
@media (min-width: 768px) {
.navbar-fixed-top .navbar-collapse,
  .navbar-static-top .navbar-collapse,
  .navbar-fixed-bottom .navbar-collapse {
    padding-right: 0;
    padding-left: 0;
  }
}
.navbar-fixed-top .navbar-collapse,
.navbar-fixed-bottom .navbar-collapse {
  max-height: 340px;
}
@media (max-device-width: 480px) and (orientation: landscape) {
  .navbar-fixed-top .navbar-collapse,
  .navbar-fixed-bottom .navbar-collapse {
    max-height: 200px;
  }
}
.navbar-fixed-top,
.navbar-fixed-bottom {
  position: fixed;
  right: 0;
  left: 0;
  z-index: 1030;
}
@media (min-width: 768px) {
  .navbar-fixed-top,
  .navbar-fixed-bottom {
    border-radius: 0;
  }
}
.navbar-fixed-bottom {
  bottom: 0;
  margin-bottom: 0;
  border-width: 1px 0 0;
}
.navbar-fixed-bottom .navbar-nav > li > .dropdown-menu {
  margin-bottom: 0;
  border-top-left-radius: 4px;
  border-top-right-radius: 4px;
  border-bottom-right-radius: 0;
  border-bottom-left-radius: 0;
}
.dropup .caret,
.navbar-fixed-bottom .dropdown .caret {
  content: "";
  border-top: 0;
  border-bottom: 4px dashed;
  border-bottom: 4px solid \9;
}
.dropup .dropdown-menu,
.navbar-fixed-bottom .dropdown .dropdown-menu {
  top: auto;
  bottom: 100%;
  margin-bottom: 2px;
}

静态的顶部

  1. 如需创建能随着页面一起滚动的导航栏，请添加 .navbar-static-top class。

该 class 不要求向 <body> 添加内边距（padding）。

代码如下：

<nav class="navbar navbar-default navbar-static-top" role="navigation">
    <div class="navbar-header">
        <a class="navbar-brand" href="#">菜鸟教程</a>
    </div>
    <div>
        <ul class="nav navbar-nav">
            <li class="active"><a href="#">iOS</a></li>
            <li><a href="#">SVN</a></li>
            <li class="dropdown">
                <a href="#" class="dropdown-toggle" data-toggle="dropdown">
                    Java <b class="caret"></b>
                </a>
                <ul class="dropdown-menu">
                    <li><a href="#">jmeter</a></li>
                    <li><a href="#">EJB</a></li>
                    <li><a href="#">Jasper Report</a></li>
                    <li class="divider"></li>
                    <li><a href="#">分离的链接</a></li>
                    <li class="divider"></li>
                    <li><a href="#">另一个分离的链接</a></li>
                </ul>
            </li>
        </ul>
    </div>
</nav>

效果如下： 静态的顶部

.navbar-static-top类的CSS代码如下：

@media (min-width: 768px) {
 .navbar-fixed-top .navbar-collapse,
  .navbar-static-top .navbar-collapse,
  .navbar-fixed-bottom .navbar-collapse {
    padding-right: 0;
    padding-left: 0;
  }
}
.navbar-static-top {
  z-index: 1000;
  border-width: 0 0 1px;
}
@media (min-width: 768px) {
  .navbar-static-top {
    border-radius: 0;
  }
}

反色的导航栏

  1. 为了创建一个带有黑色背景白色文本的反色的导航栏，只需要简单地向 .navbar class 添加 .navbar-inverse class 即可

PS：为了防止导航栏与页面主体中的其他内容的顶部相交错，请向 <body> 标签添加至少 50 像素的内边距（padding），内边距的值可以根据您的需要进行设置。

代码如下：

<nav class="navbar navbar-default navbar-inverse" role="navigation">
    <div class="navbar-header">
        <a class="navbar-brand" href="#">菜鸟教程</a>
    </div>
    <div>
        <ul class="nav navbar-nav">
            <li class="active"><a href="#">iOS</a></li>
            <li><a href="#">SVN</a></li>
            <li class="dropdown">
                <a href="#" class="dropdown-toggle" data-toggle="dropdown">
                    Java <b class="caret"></b>
                </a>
                <ul class="dropdown-menu">
                    <li><a href="#">jmeter</a></li>
                    <li><a href="#">EJB</a></li>
                    <li><a href="#">Jasper Report</a></li>
                    <li class="divider"></li>
                    <li><a href="#">分离的链接</a></li>
                    <li class="divider"></li>
                    <li><a href="#">另一个分离的链接</a></li>
                </ul>
            </li>
        </ul>
    </div>
</nav>

效果如下： 反色的导航栏

类的CSS代码如下：

.navbar-inverse {
  background-color: #222;
  border-color: #080808;
}

.navbar-inverse .navbar-brand {
  color: #9d9d9d;
}
.navbar-inverse .navbar-brand:hover,
.navbar-inverse .navbar-brand:focus {
  color: #fff;
  background-color: transparent;
}
.navbar-inverse .navbar-text {
  color: #9d9d9d;
}
.navbar-inverse .navbar-nav > li > a {
  color: #9d9d9d;
}
.navbar-inverse .navbar-nav > li > a:hover,
.navbar-inverse .navbar-nav > li > a:focus {
  color: #fff;
  background-color: transparent;
}
.navbar-inverse .navbar-nav > .active > a,
.navbar-inverse .navbar-nav > .active > a:hover,
.navbar-inverse .navbar-nav > .active > a:focus {
  color: #fff;
  background-color: #080808;
}
.navbar-inverse .navbar-nav > .disabled > a,
.navbar-inverse .navbar-nav > .disabled > a:hover,
.navbar-inverse .navbar-nav > .disabled > a:focus {
  color: #444;
  background-color: transparent;
}
.navbar-inverse .navbar-toggle {
  border-color: #333;
}
.navbar-inverse .navbar-toggle:hover,
.navbar-inverse .navbar-toggle:focus {
  background-color: #333;
}
.navbar-inverse .navbar-toggle .icon-bar {
  background-color: #fff;
}
.navbar-inverse .navbar-collapse,
.navbar-inverse .navbar-form {
  border-color: #101010;
}
.navbar-inverse .navbar-nav > .open > a,
.navbar-inverse .navbar-nav > .open > a:hover,
.navbar-inverse .navbar-nav > .open > a:focus {
  color: #fff;
  background-color: #080808;
}
@media (max-width: 767px) {
  .navbar-inverse .navbar-nav .open .dropdown-menu > .dropdown-header {
    border-color: #080808;
  }
  .navbar-inverse .navbar-nav .open .dropdown-menu .divider {
    background-color: #080808;
  }
  .navbar-inverse .navbar-nav .open .dropdown-menu > li > a {
    color: #9d9d9d;
  }
  .navbar-inverse .navbar-nav .open .dropdown-menu > li > a:hover,
  .navbar-inverse .navbar-nav .open .dropdown-menu > li > a:focus {
    color: #fff;
    background-color: transparent;
  }
  .navbar-inverse .navbar-nav .open .dropdown-menu > .active > a,
  .navbar-inverse .navbar-nav .open .dropdown-menu > .active > a:hover,
  .navbar-inverse .navbar-nav .open .dropdown-menu > .active > a:focus {
    color: #fff;
    background-color: #080808;
  }
  .navbar-inverse .navbar-nav .open .dropdown-menu > .disabled > a,
  .navbar-inverse .navbar-nav .open .dropdown-menu > .disabled > a:hover,
  .navbar-inverse .navbar-nav .open .dropdown-menu > .disabled > a:focus {
    color: #444;
    background-color: transparent;
  }
}
.navbar-inverse .navbar-link {
  color: #9d9d9d;
}
.navbar-inverse .navbar-link:hover {
  color: #fff;
}
.navbar-inverse .btn-link {
  color: #9d9d9d;
}
.navbar-inverse .btn-link:hover,
.navbar-inverse .btn-link:focus {
  color: #fff;
}
.navbar-inverse .btn-link[disabled]:hover,
fieldset[disabled] .navbar-inverse .btn-link:hover,
.navbar-inverse .btn-link[disabled]:focus,
fieldset[disabled] .navbar-inverse .btn-link:focus {
  color: #444;
}

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