JS Cut And Paste From/To Clipboard SRC

<center>
<p><textarea class="js-cuttextarea">Testing 12345..</textarea></p>
<p><button class="js-textareacutbtn">Cut </button></p>
<button id="btn">Copy</button>
<script>
var cutTextareaBtn = document.querySelector('.js-textareacutbtn');
cutTextareaBtn.addEventListener('click', function(event) {
  var cutTextarea = document.querySelector('.js-cuttextarea');
  cutTextarea.select();
  try {
    var successful = document.execCommand('cut');
    var msg = successful ? 'successful' : 'unsuccessful';
    console.log('Cuting text ' + msg);
  } catch(err) {
    alert('Error Cutting Text','Coded By BrU');
  }
});
this.btn.addEventListener('mouseup', function(event) {
  var cutTextarea = document.querySelector('.js-cuttextarea');
  cutTextarea.select();
  try {
    var successful = document.execCommand('copy');
    var msg = successful ? 'successful' : 'unsuccessful';
    console.log('Copied text ' + msg);
  } catch(err) {
    alert('Error Copying Text','Coded By BrU');
  }
});
</script>