Introduction to events - Learn web development | MDN

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Fri Sep 02 2022 23:27:55 GMT+0000 (Coordinated Universal Time)

const btn = document.querySelector('button');

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

btn.addEventListener('click', () => {
  const rndCol = `rgb(${random(255)}, ${random(255)}, ${random(255)})`;
  document.body.style.backgroundColor = rndCol;
});

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on the page for changing bg color

https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Building_blocks/Events

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Introduction to events - Learn web development | MDN

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