Javascript - 클립보드 복사

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<button id="btn1"> Copy </button>
<script src="//code.jquery.com/jquery-3.2.1.min.js"></script>
<script>
function copyToClipboard(val) {
  var t = document.createElement("textarea");
  document.body.appendChild(t);
  t.value = val;
  t.select();
  document.execCommand('copy');
  document.body.removeChild(t);
}
$('#btn1').click(function() {
  copyToClipboard('test text');
  alert('Copied!');
});
</script>