Vim tab is set to 4 spaces

Add the following to. vimrc:CodeAfter that, restart Vim to generate four spaces by pressing tab:
Set Ts = 4 (Note: ts is the abbreviation of tabstop, with four spaces in the tab width)
Set expandtab

For saved files, use the following method to replace spaces and tabs:
Replace tab with space:
: Set Ts = 4
: Set expandtab
: % Retab!

Replace spaces with tab:
: Set Ts = 4
: Set noexpandtab
: % Retab!

Add! Is used to process non-blank characters after the tab, that is, all tabs, if not added !, Only the tab at the beginning of the line is processed.