vi 中设置tab为4和自动转换成空格

:set tabstop=4        " Force tabs to be displayed/expanded to 4 spaces (instead of default 8).

:set softtabstop=4    " Make Vim treat key as 4 spaces, but respect hard Tabs.

:                     "   I don't think this one will do what you want.

:set expandtab        " Turn Tab keypresses into spaces. Sounds like this is happening to you.

"    You can still insert real Tabs as [Ctrl]-V [Tab].

:set noexpandtab      " Leave Tab keys as real tabs (ASCII 9 character).

:1,$retab!            " Convert all tabs to space or ASCII-9 (per "expandtab"),

"   on lines 1_to_end-of-file.

:set shiftwidth=4     " When auto-indenting, indent by this much.

"   (Use spaces/tabs per "expandtab".)

:help tabstop         " Find out more about this stuff.

:help vimrc           " Find out more about .vimrc/_vimrc :-)