function cntBroadcast() {
  console.warn("HALLO ICH BIN IN DER KONSOLE LMAO");
  var para = document.createElement('p');
  para.textContent = 'You clicked the button!';
  document.body.appendChild(para);
}

var buttons = document.querySelectorAll('button');

for (var i = 1; i < buttons.length ; i++) {
  buttons[i].addEventListener('click', cntBroadcast);
}