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.
按账面回报算，当时他要多投了陈安妮50万，现在能多赚5000万。 后来，王功权无意中瞄到邵亦波的履历“哈佛物理系本科、MBA、波士顿咨询顾问……”马上一拍桌子“投!”。
<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.
但该产品并不具备介绍中的神奇功能。” “买一半的水，还能做公益，意义很大。
这是让我印象最深刻的，我们整个打仗过程中都是以小搏大。他说：“要想踏上创业之旅，你必须拥有高绝的自欺欺人能力。
| 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 |
但即便如此，张兰也只是在国贸找到一个600平米的小位置，在开业的4个月内，俏江南的收入都不够支付租金和员工的工资! 即便如此，张兰还是咬牙挺了过来，俏江南的生意也终于有了转机，依靠口碑，那个“环境不错，价格不贵”的俏江南，很快火爆起来。
<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.
所以其实也是个很大的挑战，也都是些创新，要不断做创新，才能真正把付费做起来。 虽然张兰与俏江南总是话题缠身，但从一个普通人的角度看，一个白手起家的女人，靠自己的努力，积累一分一毛，忍着失去亲人的痛苦，从一家小餐馆做到全国二十个省市70家直营店的餐饮企业，哪怕里面有不少让人惋惜之处，张兰的奋斗史依然值得尊敬。
带着风险投资从业者的职业式乐观，我们认为这种矛盾背后正孕育了各种发现问题解决问题的无限机会。 天猫前几页全部展现是大商家的产品，而且一个品牌都展现若干产品啊!大商家已经有了固定的粉丝和品牌知名度，大多会通过收藏和直接搜索品牌进入店铺的。
想当初，鲁老师也是因为言辞犀利而吸引了众多粉丝的追随，粉丝们对他的评论大多都是七个字： “只说实话不坑爹。从Palantir成功退出后，Joe又连续创办两家高科技企业和两家投资机构，其中一家企业管理着5000亿美元的财富。
| 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 |