Simple copy from button click

copy.js

document.querySelector('button').addEventListener('click', () => {
  copyText('nice link');
});

function copyText(text) {
  const input = document.createElement('input');
  input.value = text;

  document.body.appendChild(input);

  input.select();
  input.setSelectionRange(0, input.value.length);
  document.execCommand('copy');

  document.body.removeChild(input);
}