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border:1px solid #333;
background-color: pink;
height:30px;
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<h1>栅格布局的实现过程</h1>
<p class="text-center">1,分成两部分：8列。4列</p>
<div class="container">
<div class="row"> <!-- 一行 -->
<div class="col-md-8 show">8</div>
<div class="col-md-4 show">4</div>
</div>
</div>
<p class="text-center">2,分成12等分</p>
<div class="container">
<div class="row">
<div class="col-md-1 show"></div>
<div class="col-md-1 show"></div>
<div class="col-md-1 show"></div>
<div class="col-md-1 show"></div>
<div class="col-md-1 show"></div>
<div class="col-md-1 show"></div>
<div class="col-md-1 show"></div>
<div class="col-md-1 show"></div>
<div class="col-md-1 show"></div>
<div class="col-md-1 show"></div>
<div class="col-md-1 show"></div>
<div class="col-md-1 show"></div>
</div>
</div>
<p class="text-center">2,分成三部分，4列，5列，3列</p>
<div class="container">
<div class="row">
<div class="col-md-4 show">4</div>
<div class="col-md-5 show">5</div>
<div class="col-md-3 show">3</div>
</div>
</div>
<p class="text-center">3,推拉操作（原始）</p>
<div class="container">
<div class="row"> <!-- 一行 -->
<!-- 推拉实现左右两部分的对调 -->
<div class="col-md-8 show">8</div>
<div class="col-md-4 show">4</div>
</div>
</div>
<p class="text-center">3,推拉操作</p>
<div class="container">
<div class="row"> <!-- 一行 -->
<!-- 推拉实现左右两部分的对调 -->
<div class="col-md-8 col-md-push-4 show">8（我被推到右边）</div>
<div class="col-md-4 col-md-pull-8 show">4（我被拉到左边）</div>
col-md-push-*/col-md-pull-*:是利用相对定位实现的。
</div>
</div>
<p class="text-center">4，嵌套（原始）</p>
<div class="container">
<div class="row"> <!-- 一行 -->
<div class="col-md-9 show">9</div>
<div class="col-md-3 show">3</div>
</div>
</div>
<p class="text-center">4，嵌套</p>
<div class="container">
<div class="row"> <!-- 一行 -->
<div class="col-md-9 clear">
<div class="col-md-3 show">3（嵌套）</div>
<div class="col-md-4 show">4（嵌套）</div>
<div class="col-md-5 show">5（嵌套）</div>
</div>
<div class="col-md-3 show">3</div>
</div>
</div>
<p class="text-center">5，偏移（前）</p>
<div class="container">
<div class="row"> <!-- 一行 -->
<div class="col-md-4 show">4</div>
<div class="col-md-4 show">4</div>
</div>
</div>
<p class="text-center">5，偏移</p>
<div class="container">
<div class="row"> <!-- 一行 -->
<div class="col-md-4 show">4</div>
<div class="col-md-4 show col-md-offset-4 show">4(我偏移了四列)</div><!-- col-md-offset-4:利用margin-left实现的,只能向右偏移 -->
</div>
</div>
</body>
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