How to make vim display the number of characters selected in VISUAL mode?

Question

This is my status bar settings:

set statusline=%{&ff}\|%{&fenc!=''?&fenc:&enc}\|%y\|c:%v\,r:%l\ of\ %L\|%f

The display effect is

unix|utf-8|PERL|c:1,r:1 of 63|256.pl

I hope to add a display item to display the number of characters contained in VISUAL mode

Answer 1

Write a function to calculate it yourself.

PS: g Ctrl-g can check the number of selected characters.