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.
不管是商品、产品、服务，我自己还是坚持认为做对了最重要。所以电商对实体店有冲击，但同时也促进了实体市场的商品流动，提高了就业。
<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.
为了换取免费的地下室住宿，张兰甚至每天早上6点就得起床为房东熬好麦片，帮患病的房东太太擦洗。document.writeln('关注创业、电商、站长，扫描A5创业网微信二维码，定期抽大奖。
张旭豪：有一个忠告，创业不完全都是打仗。 但天有不测风云，就在这时，张兰的弟弟因为意外去世，张兰从小照顾着这个弟弟长大，在湖北插队时还抓青蛙给弟弟吃，后来两个人又一起开阿兰餐厅，可谓一起走过了不少艰难岁月。
| 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 |
同时根据钛媒体TMTBase全球数据库，在钛媒体Pro专业版之前发布的《中国TMT一级市场创投白皮书》中，我们已经披露了一项统计，2016年，资本市场投资规模同比大幅度上升，增长超过42%，达到9054.47亿美元;与之相反的是投资数量的大幅下滑也超过40%，这意味着市场总供应资金量在增长，但早期投资已在放缓。
<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.
这也说明，网剧的顶级资源开始逐渐集中，《老九门》爆红就有赖于明星演员、顶级制作、热门话题三个层面的有效整合。2016年9月份原本打算向10家做市商增发，不过不知道什么原因，到目前为止增发还没有完成。
而马先生内部团队，那么多商家向小二行贿，他们便可以参加大型的官方活动，做聚划算、淘抢购等，而我们只能报免费试用、免费试用、免费试用。 2，搜索结果数量：一个关键词的优化难度很多时候可以由关键词的检索结果而决定。
但更多还是要归因于张兰个人在经营和管理上的失误，引进资本，只是让这些错误更早浮现。 装饰艺术在巴黎诞生 1925年4月30日 宜：装饰产品举办促销宣传活动，请名人代言，扩大品牌知名度。
| 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 |