Black diamonds instead of text, what should I do?

Question

JavaScript

I load the text into the input, I output it, but instead of the text, question marks appear in a black rhombus. The downloaded text is in ANSI encoding, and if you convert it to UTF-8, then everything works fine. But it is necessary for ANSI to work.
the code

Answer 1

I figured out this problem, everything turned out to be very simple: it was just necessary to specify the windows-1251 encoding as the second parameter in the readAsText method, because. default is UTF-8

Answer 2

<meta charset="ANSI">
have you tried?