--- a/.vimrc	Sun Jan 25 18:40:52 2015 +0800
+++ b/.vimrc	Sun Jan 25 18:41:35 2015 +0800
@@ -62,6 +62,10 @@
 nmap <C-Up> ddkP
 nmap <C-Down> ddp
 
+" show column
+nnoremap <F3> :setlocal cursorcolumn!<CR>
+imap <F3> <C-O><F3>
+
 syntax on
 filetype plugin indent on