The default grid system provided in Bootstrap utilizes 12 columns that render out at widths of 724px, 940px (default without responsive CSS included), and 1170px. Below 767px viewports, the columns become fluid and stack vertically.
<div class="row">
<div class="span4">...</div>
<div class="span8">...</div>
</div>
As shown here, a basic layout can be created with two "columns", each spanning a number of the 12 foundational columns we defined as part of our grid system.
<div class="row">
<div class="span4">...</div>
<div class="span4 offset4">...</div>
</div>
With the static (non-fluid) grid system in Bootstrap, nesting is easy. To nest your content, just add a new .row and set of .span* columns within an existing .span* column.
.span3 columns should be placed within a .span6.
<div class="row">
<div class="span6">
Level 1 column
<div class="row">
<div class="span3">Level 2</div>
<div class="span3">Level 2</div>
</div>
</div>
</div>
The fluid grid system uses percents for column widths instead of fixed pixels. It also has the same responsive variations as our fixed grid system, ensuring proper proportions for key screen resolutions and devices.
听，听别人讲，在与别人聊天和交流中学习他的真知灼见，因为人与人的沟通时，总会不自觉地把自己最好的一面展现出来，好为人师是每个人潜藏在内心的欲望。在开发过程中，杨国强自己的建筑公司承担了集团一半以上的建筑项目。
<div class="row-fluid">
<div class="span4">...</div>
<div class="span8">...</div>
</div>
Nesting with fluid grids is a bit different: the number of nested columns doesn't need to match the parent. Instead, your columns are reset at each level because each row takes up 100% of the parent column.
<div class="row-fluid">
<div class="span12">
Level 1 of column
<div class="row-fluid">
<div class="span6">Level 2</div>
<div class="span6">Level 2</div>
</div>
</div>
</div>
The default and simple 940px-wide, centered layout for just about any website or page provided by a single <div class="container">.
<body>
<div class="container">
...
</div>
</body>
<div class="container-fluid"> gives flexible page structure, min- and max-widths, and a left-hand sidebar. It's great for apps and docs.
<div class="container-fluid">
<div class="row-fluid">
<div class="span2">
<!--Sidebar content-->
</div>
<div class="span10">
<!--Body content-->
</div>
</div>
</div>
Media queries allow for custom CSS based on a number of conditions—ratios, widths, display type, etc—but usually focuses around min-width and max-width.
“去年有一段时间我个人非常焦虑，一方面是因为当时有很多还不错的公司找我，诱惑太多。因为在这些年里，HTC没有在手机供应链上的任何优势，没有专利，缺少技术及研发，也没有生产零部件的能力，想要跟诺基亚、微软一样单凭技术专利就能有相当大的收入是不可能的，想要转型成为手机零部件生产供应商也是不可行。
雷军在历史转折期间答错的题，可能比答对的这道更贵，毕竟目前小米估值腰斩的说法甚嚣尘上。 武汉乐百龄生物科技公司张经理介绍称，其公司最好销售的地区是在上海，当场销了200万。
| Label | Layout width | Column width | Gutter width |
|---|---|---|---|
| Smartphones | 480px and below | Fluid columns, no fixed widths | |
| Smartphones to tablets | 767px and below | Fluid columns, no fixed widths | |
| Portrait tablets | 768px and above | 42px | 20px |
| Default | 980px and up | 60px | 20px |
| Large display | 1200px and up | 70px | 30px |
一位用户反映，自己刚刚去了北京友友联创信息技术有限公司位于大兴区的注册地点，但“大门紧锁”。
<meta name="viewport" content="width=device-width, initial-scale=1.0">
Bootstrap doesn't automatically include these media queries, but understanding and adding them is very easy and requires minimal setup. You have a few options for including the responsive features of Bootstrap:
Why not just include it? Truth be told, not everything needs to be responsive. Instead of encouraging developers to remove this feature, we figure it best to enable it.
/* Landscape phones and down */
@media (max-width: 480px) { ... }
/* Landscape phone to portrait tablet */
@media (max-width: 767px) { ... }
/* Portrait tablet to landscape and desktop */
@media (min-width: 768px) and (max-width: 979px) { ... }
/* Large desktop */
@media (min-width: 1200px) { ... }
For faster mobile-friendly development, use these basic utility classes for showing and hiding content by device.
自己的影响力去做更多有意义的事情，我们必须持续打仗，必须持续地打赢，就这么简单。这声音混杂在街头纷乱的电动三轮车鸣笛声中，宣告着移动互联网的浪潮正在飞速席卷这个12亿人口的国家。
综艺本身带有互动性，是否有可能出现一种新的综艺形式?在传统综艺基础上加上互动，从而让用户直接付费，比如马东老师的《饭局的诱惑》，就在直播平台上通过打赏的方式收费。 当时值班的是分社的记者小王，一看有人来找组织，也不好推脱，就给杨国强支招，“北京有个景山学校，里面全是有钱人家的孩子，你去找找关系办个分校，房子不就卖出去了嘛”。
接下来发生的一切就比较有趣了。极限运动领域虽然避开了市场竞争，但由于过于细分，这部分爱好者群体有多大并不清晰，依靠细分领域的草根明星来聚集用户的方式也有待观望。
| Class | Phones 480px and below | Tablets 767px and below | Desktops 768px and above |
|---|---|---|---|
.visible-phone |
Visible | Hidden | Hidden |
.visible-tablet |
Hidden | Visible | Hidden |
.visible-desktop |
Hidden | Hidden | Visible |
.hidden-phone |
Hidden | Visible | Visible |
.hidden-tablet |
Visible | Hidden | Visible |
.hidden-desktop |
Visible | Visible | Hidden |