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.
共享单车在中国发展很快，在短短半年光景里，ofo走出了校园，摩拜单车走出了北上广深，而且越来越多的地域性的共享单车创业者开始涌现出来。把这件事做到极致，是我们在内部运营或很多创新方面要做的事情。
<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.
但他的反应几乎是神速的，对骑手的安全是很重视的。我们联合邀请了蜻蜓FM、华尔街见闻、知识分子等新锐媒体创始人，也包括第一财经、咪咕视讯的等传统媒体的掌门人，另外作为活跃在内容投资领域的真格基金，也加入了沙龙的讨论。
2016年，这家公司在半年之内完成两轮融资，总计超过2亿元。 如果你的梦想是做一个平台，就不要在一开始就想1%甚至是5%的占有率，也不要在一开始就想着要去去做平台。
| 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 |
3、AD-3虽然点击量很低，但依然带来了转化，说明这个位置隐蔽，但是商品是用户所需要的。
<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.
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。 关于变现问题，这里面我列了几个非常成功的例子，包括像二更、一条、papi酱、罗辑思维等新媒体创业公司，我们感觉到它们的盈利能力非常强，做一个投资人很高兴，无论我们是不是他的投资人，我们认为这个商业模式是非常健康的。
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。 半年以后，王公权被一位朋友拉去硅谷参加一个5000多人的互联网展示会，他一下子被迷住了。
做为一位站长，我见证了SEO初起时的风头无限，也看见了如今PC端流量的日落西山。最常见的微文案涵盖了错误信息、按钮标签、提示文本。
| 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 |