NerdTree比較使用的命令
o.......open files, directories and bookmarks
go.....open select file, but leave cursor in the NERDTree
x.......close the current nodes parent
P.......jump to the root node
p.......jump to current nodes parent
<C-J>.jump down to the next sibling of the current directory
<C-K>.jump up to the previous sibling of the current directory
m......display the NERDTree menu
q.......close the NERDTree window
A.......Zoom (maximize/minimize) the NERDTree window
