Keypress function

Hello, my goal is to simulate keyboard presses in JavaScript and send them at regular intervals in the text input of messaging application.
However, not being a professional of JavaScript, I face several problems in my program below :

1) Being sure that the keystroke simulation is triggered.
2) Apply the right input format for the application, in my program I have "windows" but it triggers an error in the execution of the program because it does not run in an HTML page.
3) Finally, send the...

Keypress function