Javascript code for spouting rgb colors

random-color.js

function randomNumber(maxNum) {
  return Math.floor((maxNum * Math.random()) + 1);
}

function randomRgb() {
  var r = randomNumber(256),
      g = randomNumber(256),
      b = randomNumber(256);
  
  return 'rgb(' + 
    r + ', ' +
    g + ', ' +
    b + 
  ')';
}

function changeBackgroundColor(element) {
  element.style.backgroundColor = randomRgb();
}