(function(){ // protection de l'environnement global

​

let b1 = document.querySelector('button#b1');

​

b1.addEventListener("click", () => {

  let previousContent = b1.textContent;

  b1.textContent = "(en attente)";

  b1.disabled = true;

  setTimeout(() => {

    alert("message");

    b1.textContent = previousContent;

    b1.disabled = false;

  }, 2000);

});

})();