1
1
1
1
1
1
1
1
1
1
1
1
4
4
4
4
8
6
6
12

pk10赛车 www.el4n.com 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.


Offsetting columns

4
4 offset 4
3 offset 3
3 offset 3
8 offset 4
<div class="row">
    <div class="span4">...</div>
    <div class="span4 offset4">...</div>
</div>

Nesting columns

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.

Example

p>Nested rows should include a set of columns that add up to the number of columns of it's parent. For example, two nested .span3 columns should be placed within a .span6.

Level 1 of column
Level 2
Level 2
<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>

Fluid columns

1
1
1
1
1
1
1
1
1
1
1
1
4
4
4
4
8
6
6
12

Percents, not pixels

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.

Fluid rows

Make any row fluid simply by changing .row to .row-fluid. The columns stay the exact same, making it super straightforward to flip between fixed and fluid layouts.

Markup

<div class="row-fluid">
    <div class="span4">...</div>
    <div class="span8">...</div>
</div>

Fluid nesting

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.

Fluid 12
Fluid 6
Fluid 6
<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>

Fixed layout

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>

Fluid layout

<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>

What they do

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.

  • Modify the width of column in our grid
  • Stack elements instead of float wherever necessary
  • Resize headings and text to be more appropriate for devices

Use media queries responsibly and only as a start to your mobile audiences. For larger projects, do consider dedicated code bases and not layers of media queries.

Supported devices

Bootstrap supports a handful of media queries in a single file to help make your projects more appropriate on different devices and screen resolutions. Here's what's included:

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

Requires meta tag

To ensure devices display responsive pages properly, include the viewport meta tag.

<meta name="viewport" content="width=device-width, initial-scale=1.0">

Using the media queries

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:

  1. Use the compiled responsive version, bootstrap-responsive.css
  2. Add @import "responsive.less" and recompile Bootstrap
  3. Modify and recompile responsive.less as a separate file

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) { ... }

Responsive utility classes

What are they

For faster mobile-friendly development, use these basic utility classes for showing and hiding content by device.

When to use

Use on a limited basis and avoid creating entirely different versions of the same site. Instead, use them to complement each device's presentation.

For example, you might show a <select> element for nav on mobile layouts, but not on tablets or desktops.

Support classes

Shown here is a table of the classes we support and their effect on a given media query layout (labeled by device). They can be found in responsive.less.

Class Phones 480px and below Tablets 767px and below Desktops 768px and above
.visible-phone Visible
.visible-tablet Visible
.visible-desktop Visible
.hidden-phone Visible Visible
.hidden-tablet Visible Visible
.hidden-desktop Visible Visible
  • 土地不是劳动成果,而是一种自然资源,就像空气、阳光不是劳动成果而是自然资源一样,所以土地不具有价值,买房只应支付房屋费,不应该支付土地费。 2019-04-20
  • 靠山山倒不如靠自己。远水救不了近火,这样的简单道理都不懂该有这样一劫 2019-04-20
  • 龙永图力挺制造业 密集型产业不能丢 2019-04-20
  • 中央纪委紧盯节点 4年来通报曝光问题近4000起 2019-04-17
  • 在端午品味文化的芳香 锐评 2019-04-17
  • 全国纪检监察机关上半年处分省级干部41人 2019-04-11
  • 综述:推动美丽中国建设的强大动力——海外关注习近平总书记在全国生态环境保护大会上的讲话 2019-04-11
  • 共产主义社会,马克思主义对未来的科学预测。对于共产党人来说,是自己的信仰,对于相信这种科学预测者来说,是一种价值追求。至于未来的共产主义实行什么样的分配方式,马 2019-04-09
  • 不好意思了,忘记还有赌球一说。[哈哈] 2019-04-09
  • 女性之声——全国妇联 2019-04-07
  • 火箭想送走安德森必须搭上他 不出此人难以打动对方 2019-04-07
  • 乌鲁木齐举办端午戏曲交响音乐会 两团一院名角新秀齐亮相 2019-04-06
  • 阿富汗官方证实巴基斯坦塔利班头目死于美军空袭 2019-04-06
  • 【理上网来·喜迎十九大】Cheng Li:过去五年中国在多领域取得巨大成效 2019-04-04
  • 天使之城,曼谷文章中国国家地理网 2019-04-04
  • 476| 112| 464| 557| 625| 480| 711| 305| 577| 960| 749| 717| 833| 282| 217|