What's NERDTree : A tree explorer plugin for vim.
Install :
Using Vundle on .vimrc
" for NERDTREE Plugin 'scrooloose/nerdtree'
Short Key :
open NERDTree
" for NERDTree :nmap <F9> :NERDTree<CR>
Close NERDTree
Key in 'q'
若使用上列的命令，按下F9，再按 q 才能關，不甚方便，
若使用下列命令，則按下 F9 開啟，再按 F9 就是關閉，端看個人應用。
" for NERDTree :nmap <F9> :NERDTreeToggle<CR>
Switch between windows
Key in 'ctrl-w w'
NERDTree-o
Open files, directories and bookmarks
*NERDTree-A* 是大 A 哦！
Maximize (zoom) and minimize the NERDtree window.