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This article introduces the knowledge of "how to use Bootstrap responsive layout". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

I. the working principle of the grid system:

1. In this system, our row must be included in our fixed width (.container) or full screen width up to 100%, so that we can add appropriate aligment and padding to it.

2. Through the characteristics of rows (row), we can create a set of columns (column) horizontally.

3. When we use it, the content needs to be placed in the column, and only the column (column) can be used as a direct child element of our row (row).

4. For classes such as .row and col-xs-4, we can be used to quickly create grid layouts, not only the mixin defined in the bootstrap source code can also be used to create semantic layouts.

5. When this layout is used, we can also set the padding property. This creates a gutter between the columns, and then counteracts the padding set by the .rowd element by setting a negative value for the .rowd element, which indirectly counteracts the padding for the column (column) contained in the row.

6. If the column of the system specifies a value from 1 to 12 to represent the span range.

7. In the system, if we are setting up a row (row) that contains columns (column) greater than 12, the elements of the redundant columns will be arranged in another row as a whole.

Second, use Bootstrap responsive layout

First, let's add the following code to the new page, as follows:

We can know from the code that we add the viewpirt attribute in the mate tag, the width in content is equal to the width of the device, initial-scale: the zoom level of the visible area of the page is displayed for the first time, with a value of 1, the page is displayed according to the actual size, without any zoom; maximum-scale: the minimum ratio to which the user is allowed to zoom; user-scalable: whether the user can zoom manually.

Let's look at the following code and running results according to this system:

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