這樣就看得到了…………..
一直覺得自已不會遇到BOM
不過最近遇到了 ….

~/.vimrc
[sourcecode language='text']
set ls=2
set statusline=%<%f\ %h%m%r%=%{\”[\".(&fenc==\"\"?&enc:&fenc).((exists(\"+bomb\")\ &&\ &bomb)?\",B\":\"\").\"]\ \”}%k\ %-14.(%l,%c%V%)\ %P
highlight StatusLine ctermfg=blue ctermbg=black
[/sourcecode]

Ref.

http://vim.wikia.com/wiki/Show_fileencoding_and_bomb_in_the_status_line