Vim:如何在vimrc中使用变量？

let my_variable = "Hello, world!"

echo my_variable

let my_name = "John"
let my_greeting = "Hello, " . my_name . "!"
echo my_greeting

function! MyFunction(name)
  let greeting = "Hello, " . a:name . "!"
  echo greeting
endfunction

call MyFunction("John")

let my_key = "<leader>m"
nnoremap <expr> my_key ':MyFunction("John")<CR>'

let my_tab_width = 4
set tabstop=my_tab_width
set shiftwidth=my_tab_width

let my_editor = $EDITOR
if empty(my_editor)
  let my_editor = "vim"
endif
echo "Using " . my_editor . " as the editor"