--- a/.vimrc	Sun Jan 25 18:44:20 2015 +0800
+++ b/.vimrc	Mon Jan 26 01:07:39 2015 +0800
@@ -34,6 +34,8 @@
 set shiftround
 set expandtab
 
+set listchars=tab:>-,trail:·
+
 set number        " show line numbers
 set laststatus=2  " always show status line
 set ttimeoutlen=0 " eliminate delay after <ESC>
@@ -66,6 +68,10 @@
 nnoremap <F3> :setlocal cursorcolumn!<CR>
 imap <F3> <C-O><F3>
 
+" show listchars
+nnoremap <F4> :setlocal list!<CR>
+imap <F4> <C-O><F4>
+
 syntax on
 filetype plugin indent on