const domReady = (fn) => {
  document.addEventListener("DOMContentLoaded", fn);
}

domReady(() => {
  let btn = document.body.querySelector("body button#btnShowAndDisapear");
  let block = document.body.querySelector("div.show");
  let count = 1;
  btn.onclick = () => {
    block.style.display = "block";
    btn.remove()
    console.log(`clicou ${count} vez(es)!`);
    count++;
  };
})