What is the difference between bootstrap4.0 and 3.0

Differences: 1. Bootsrap3 uses float layout, and Bootstrap4 uses flex layout; 2. The grid system in Bootstrap4 does not need to add a specified number of columns, but Bootsrap3 cannot; 3. Bootstrap3 has 4 grid classes, and Bootstrap4 does 5 grid types.

The operating environment of this tutorial: Windows7 system, bootsrap4 version, DELL G3 computer

The difference between Bootstrap4 and Bootstrap3

• Bootsrap3 uses float layout, while Bootstrap4 uses flex layout

• The grid system in Bootstrap4 does not need to add a specified number of columns such as row There are 2 cols in it, which will divide the rows evenly in any size.

• Bootstrap3 only has 4 raster types: col-xs extra small, col-sm small, col-md, medium col-lg large)

• Bootstrap4 has 5 raster types, (col-extra small, col-sm-small, col-md-medium, col-lg-large, col -xl-extra large)

• Bootstrap4 uses rem as the unit

• Bootstrap4 passes offset-sm-4 when setting column offset, while Bootstrap3 passes col-sm-offset-4

• Bootstrap4 adds responsive containers such as container-sm, container-md..., which will occupy the entire screen when the screen size is smaller than the grid class.

Note:

hidden-xs,visible-xs in Bootstrap3 cannot be used in

Bootstrap4

ClassIn Bootstrap4, if you want to hide at a certain size, you should refer to the following tableBootstrap3Bootstrap4d-sm-block##hidden-smd-sm-none d-md-blockhidden-mdd-md-none d-lg-blockhidden-lgd-lg-none d-xl-blockhidden-xld- xl-nonevisible-xsd-sm-nonevisible-sm d-sm-block d-md-nonevisible-mdd-md-block d-lg-nonevisible-lgd-lg-block d-xl-none

	##hidden-xs
##visible-xl	d-xl-block

It is worth mentioning that using hidden-sm in B3 will only hide the sm size, while other sizes will be displayed normally. In B4, if you simply specify d-sm -none, the element will be hidden in the sm size, but the size above sm will also be hidden, and the size below sm will be displayed normally. This involves upward compatibility issues, so you must set md when setting the sm element to be hidden. The size display is as shown in the table above, and so on for others
Hide upward compatibility, show downward compatibility

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