gameSample.js

// Get Nodes
var buttonA = document.getElementById('a');
var buttonB = document.getElementById('b');

// Define functions
var resultOne = function () {
  alert('Thing One')
}
var resultTwo = function () {
  alert('Thing Two')
}
var rollDice = function () {
  // return a random number between 0 and 100
  return Math.floor(Math.random() * 100)
}
var thingOne = function () {
  var rando = rollDice();
  if (rando < 75) {
    resultOne()
  } else {
    resultTwo()
  }
}

// Bind Events
buttonA.addEventListener('click', thingOne);
buttonB.addEventListener('click', thingTwo);