Why the substitute in the selection only substitute the first letter in the selection in my vimscript?

Why the substitute in the selection only substitute the first letter in the selection?

The \%V option works fine when I just use the command line to exec it.

But it seems not work very well when I use it in the vimscript.

vnoremap <leader>dfc :call DragonflyCmdProcess(1)<CR>

function! DragonflyCmdProcess(visual)
if a:visual
normal! gv
" execute "s/\\%V./&,/g"
execute "'<,'>s/\\%Ve/x/g"
else
endfunction

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