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bootstrap 2 基本css之栅格系统

一:12格结构

二:

<div class="container">        <h1>Hello, world!</h1>        <div class="row">            <div class="col-xs-4">                <h2 class="page-header">区域一</h2>                <p>Bootstrap has a few easy ways to quickly get started, each one appealing to a different skill level and use case. Read through to see what suits your particular needs.</p>            </div>            <div class="col-xs-4">                <h2 class="page-header">区域二</h2>                <p>If you work with Bootstrap‘s uncompiled source code, you need to compile the LESS files to produce usable CSS files. For compiling LESS files into CSS, we only officially support Recess, which is Twitter‘s CSS hinter based on less.js.</p>            </div>            <div class="col-xs-4">                <h2 class="page-header">区域三</h2>                <p>Within the download you‘ll find the following directories and files, logically grouping common resources and providing both compiled and minified variations.</p>            </div>        </div>    </div>

三:

.col-xs-超小屏幕 手机 None (自动)
.col-sm-小屏幕 平板 750px
.col-md-中等屏幕 桌面显示器 970px
.col-lg-大屏幕 大桌面显示器 1170px

.col-xs   当屏幕变小时,一直是竖列的状态

其余的当小于最右边的值时,改变为水平状态。

<div class="row">  <div class="col-xs-12 col-sm-6 col-md-8">.col-xs-12 .col-sm-6 .col-md-8</div>  <div class="col-xs-6 col-md-4">.col-xs-6 .col-md-4</div></div><div class="row">  <div class="col-xs-6 col-sm-4">.col-xs-6 .col-sm-4</div>  <div class="col-xs-6 col-sm-4">.col-xs-6 .col-sm-4</div>  <!-- Optional: clear the XS cols if their content doesn‘t match in height -->  <div class="clearfix visible-xs-block"></div>  <div class="col-xs-6 col-sm-4">.col-xs-6 .col-sm-4</div></div>
当高度不一致时需要clear
<div class="row">  <div class="col-xs-6 col-sm-3">.col-xs-6 .col-sm-3</div>  <div class="col-xs-6 col-sm-3">.col-xs-6 .col-sm-3</div>  <!-- Add the extra clearfix for only the required viewport -->  <div class="clearfix visible-xs-block"></div>  <div class="col-xs-6 col-sm-3">.col-xs-6 .col-sm-3</div>  <div class="col-xs-6 col-sm-3">.col-xs-6 .col-sm-3</div></div

 

四:流式布局容器

将最外面的布局元素 .container 修改为 .container-fluid,就可以将固定宽度的栅格布局转换为 100% 宽度的布局

<div class="container-fluid">  <div class="row">    ...  </div></div>
五:列偏移

使用 .col-md-offset-* 类可以将列向右侧偏移。这些类实际是通过使用 * 选择器为当前元素增加了左侧的边距(margin)。例如,.col-md-offset-4 类将 .col-md-4 元素向右侧偏移了4个列(column)的宽度。

<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><div class="row">  <div class="col-md-3 col-md-offset-3">.col-md-3 .col-md-offset-3</div>  <div class="col-md-3 col-md-offset-3">.col-md-3 .col-md-offset-3</div></div><div class="row">  <div class="col-md-6 col-md-offset-3">.col-md-6 .col-md-offset-3</div></div>
六:嵌套列

为了使用内置的栅格系统将内容再次嵌套,可以通过添加一个新的 .row 元素和一系列 .col-sm-* 元素到已经存在的.col-sm-* 元素内。被嵌套的行(row)所包含的列(column)的个数不能超过12(其实,没有要求你必须占满12列)。

 

<div class="row">  <div class="col-sm-9">    Level 1: .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>
七:列排序

通过使用 .col-md-push-*.col-md-pull-* 类就可以很容易的改变列(column)的顺序。

push(推) 右;  pull(拉) 左

<div class="row">  <div class="col-md-9 col-md-push-3">.col-md-9 .col-md-push-3</div>  <div class="col-md-3 col-md-pull-9">.col-md-3 .col-md-pull-9</div></div>