Keyboard Event: How to detect keyboard you typed: e.which, e.keycode, e.key, e.charcode, e.code

which, keycode, key, charcode, code

when I type 'f',

charCode: 0
keyCode: 70
key='f'
code='KeyF'
which: 102

• charCode, keyCode: deprecated
• charCode: Non-standard

Reference