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

          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="8nk4nb row">
              <div class="o5tscy span4">...</div>
              <div class="5a102x 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.

          青青草在线视频Wp4

          4
          4 offset 4
          3 offset 3
          3 offset 3
          8 offset 4
          <div class="xck3l1 row">
            <div class="6uomne span4">...</div>
            <div class="qdvh7d span4 offset4">...</div>
          </div>
          

          青青草在线视频Wp4

          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

          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="90dbo8 row">
            <div class="ksoguv span6">
              Level 1 column
              <div class="zhb9ok row">
                <div class="6pwtsn span3">Level 2</div>
                <div class="yi9vcs span3">Level 2</div>
              </div>
            </div>
          </div>
          

          青青草在线视频Wp4

          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="pw17k1 row-fluid">
            <div class="io3h60 span4">...</div>
            <div class="27nisn span8">...</div>
          </div>
          

          青青草在线视频Wp4

          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="45o25w row-fluid">
            <div class="4fxlmx span12">
              Level 1 of column
              <div class="9z9gze row-fluid">
                <div class="d4f5bh span6">Level 2</div>
                <div class="e0apin span6">Level 2</div>
              </div>
            </div>
          </div>
          
          Variable Default value Description
          @gridColumns 12 Number of columns
          @gridColumnWidth 60px Width of each column
          @gridGutterWidth 20px Negative space between columns

          Variables in LESS

          Built into Bootstrap are a handful of variables for customizing the default 940px grid system, documented above. All variables for the grid are stored in variables.less.

          How to customize

          Modifying the grid means changing the three @grid* variables and recompiling Bootstrap. Change the grid variables in variables.less and use one of the four ways documented to recompile. If you're adding more columns, be sure to add the CSS for those in grid.less.

          Staying responsive

          Customization of the grid only works at the default level, the 940px grid. To maintain the responsive aspects of Bootstrap, you'll also have to customize the grids in responsive.less.

          青青草在线视频Wp4

          The default and simple 940px-wide, centered layout for just about any website or page provided by a single <div class="ru0xx4 container">.

          <body>
            <div class="k1pd0c container">
              ...
            </div>
          </body>
          

          青青草在线视频Wp4

          <div class="7vabrx container-fluid"> gives flexible page structure, min- and max-widths, and a left-hand sidebar. It's great for apps and docs.

          <div class="fvgp0p container-fluid">
            <div class="j7o9af row-fluid">
              <div class="zfjhg4 span2">
                <!--Sidebar content-->
              </div>
              <div class="lcso3e span10">
                <!--Body content-->
              </div>
            </div>
          </div>
          

          Responsive devices

          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.

          青青草在线视频Wp4

          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 青青草在线视频Wp4, 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">

          青青草在线视频Wp4

          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) { ... }
          

          青青草在线视频Wp4

          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

          Test case

          Resize your browser or load on different devices to test the above classes.

          Visible on...

          Green checkmarks indicate that class is visible in your current viewport.

          • Phone✔ Phone
          • Tablet✔ Tablet
          • Desktop✔ Desktop

          Hidden on...

          Here, green checkmarks indicate that class is hidden in your current viewport.

          • Phone✔ Phone
          • Tablet✔ Tablet
          • Desktop✔ Desktop


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