You may have heard a “big news”: Bootstrap4 merged the PR codenamed #21389, announced that it would give up support for IE9, and use the flexbox flexbox model by default.
This marks the further ad
Tag: exploration
Read Guolin “The First Radio Code” note – Chapter 4 mobile phone tablet should be taken into account, explore the fragmentation
(Fragment) is a kind of UI fragment that can be embedded in the activity, it can make the program more reasonable and make full use of the space of the large screen, so it is widely used on the tab