Copy text to the user's clipboard

copy.js

var copy = (function() {
  var input = document.createElement('input');
  input.style.opacity = '0';
  input.style.position = 'fixed';
  input.style.top = '-1000%';
  document.body.appendChild(input);
  
  return function copy(text) {
    input.value = text;
    input.select();
  
    try {
      document.execCommand('copy');
    } catch(err) { }
  
    input.blur();
  }
})();