JSFiddle - React, Tailwind, and code Playground

by exercices

HTML

<p>
Detecter la touche "Ctrl".
</p>

JavaScript

var ctrlPressed = false;
document.onkeydown=function checkKeyDown(e){
	if(e.code=="ControlLeft"||e.code=="ControlRight"){
		ctrlPressed=true;
	}else{ctrlPressed=false;}
};
document.onkeyup=function checkKeyUp(e){
	if(e.code=="ControlLeft"||event.code=="ControlRight"){
		if(ctrlPressed){alert("CTRL only pressed");}
	}
};