vim - :arg mean in vimscript? 是什么

Question

这是一个例子:

function! Mynumber(arg)
  echo line(".") . " " . a:arg
endfunction

当您1,3调用 Mynumber(getline(".")) 时，它会打印行号和当前缓冲区的前三行中的每一行。

Answer 1

变量的前缀a:表示这个变量属于它出现的函数的参数列表(参数)。

另见:help internal-variables

There are several name spaces for variables.  Which one is to be used is
specified by what is prepended:

        (nothing) In a function: local to a function; otherwise: global
buffer-variable    b:     Local to the current buffer.
window-variable    w:     Local to the current window.
tabpage-variable   t:     Local to the current tab page.
global-variable    g:     Global.
local-variable     l:     Local to a function.
script-variable    s:     Local to a :source'ed Vim script.
function-argument  a:     Function argument (only inside a function).
vim-variable         v:   Global, predefined by Vim.