function randomInteger(max) {

    return Math.floor(Math.random()*(max + 1));

}

​

function randomRgbColor() {

    let r = randomInteger(255);

    let g = randomInteger(255);

    let b = randomInteger(255);

    return [r,g,b];

}

​

function randomHexColor() {

    let [r,g,b] =randomRgbColor();

​

    let hr = r.toString(16).padStart(2, '0');

    let hg = g.toString(16).padStart(2, '0');

    let hb = b.toString(16).padStart(2, '0');

​

    return "#" + hr + hg + hb;

}

​

function changeColor() {

  let hex = randomHexColor();

  document.getElementById('color').value = hex;

  document.getElementById('text').innerHTML = hex;

}

​

function clickHandler(event) {

  changeColor();

  event.preventDefault();

}

​

document.addEventListener('click', clickHandler);

​

changeColor();