通过下面的表格可以详细查看栅格系统如何在多种不同屏幕大小的设备上工作的。

网格类适用于屏幕宽度大于或等于断点大小的设备，并覆盖针对较小设备的网格类。 因此，应用任何 .col-md- 一个元素的类不仅会影响其在中型设备上的风格，而且还会影响其在大型设备上的风格 .col-lg- 元素内即可。

How it works Bootstrap’s grid system uses a series of containers, rows, and columns to layout and align content. It’s built with flexbox and is fully responsive. Below is an example and an in-depth look at how the grid comes together.

<div class="container">
    <div class="row">
        <div class="col-sm">
            One of three columns
        </div>
        <div class="col-sm">
            One of three columns
        </div>
        <div class="col-sm">
            One of three columns
        </div>
    </div>
</div>

The above example creates three equal-width columns on small, medium, large, and extra large devices using our predefined grid classes. Those columns are centered in the page with the parent .container.

Breaking it down, here’s how it works:

• Containers provide a means to center and horizontally pad your site’s contents. Use .container for a responsive pixel width or .container-fluid for width: 100% across all viewport and device sizes.
• Rows are wrappers for columns. Each column has horizontal padding (called a gutter) for controlling the space between them. This padding is then counteracted on the rows with negative margins. This way, all the content in your columns is visually aligned down the left side.
• In a grid layout, content must be placed within columns and only columns may be immediate children of rows.
• Thanks to flexbox, grid columns without a specified width will automatically layout as equal width columns. For example, four instances of .col-sm will each automatically be 25% wide from the small breakpoint and up. See the auto-layout columns section for more examples.
• Column classes indicate the number of columns you’d like to use out of the possible 12 per row. So, if you want three equal-width columns across, you can use .col-4.
• Column widths are set in percentages, so they’re always fluid and sized relative to their parent element.
• Columns have horizontal padding to create the gutters between individual columns, however, you can remove the margin from rows and padding from columns with .no-gutters on the .row.
• To make the grid responsive, there are five grid breakpoints, one for each responsive breakpoint: all breakpoints (extra small), small, medium, large, and extra large.
• Grid breakpoints are based on minimum width media queries, meaning they apply to that one breakpoint and all those above it (e.g., .col-sm-4 applies to small, medium, large, and extra large devices, but not the first xs breakpoint).
• You can use predefined grid classes (like .col-4) or Sass mixins for more semantic markup.

Full documentation presenting all available options and examples you can find on: http://getbootstrap.com/docs/4.1/layout/grid/