html - Add copy button in Javascript -

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i'm trying add button copy text textarea using zeroclipboard, however, when click button, nothing happens , when paste nothing has been added clipboard.

var clip = new zeroclipboard( document.getelementbyid("btn4"), {   moviepath: "https://rawgit.com/zeroclipboard/zeroclipboard/master/dist/zeroclipboard.swf" } );  clip.on( "load", function(client) {   // alert( "movie loaded" );    client.on( "complete", function(client, args) {     // `this` element clicked     this.style.display = "none";   } ); } ); 
<div id ="right" style = "float:left; width: 10%; margin-left:185px; margin-top:35px">   <button id="btn4" data-clipboard-target="block2" name ="btn4" type="button" class="btn btn-success"><i class="icon-white icon-file"></i> copy</button>    <script src="https://rawgit.com/zeroclipboard/zeroclipboard/master/dist/zeroclipboard.js"></script> </div>  <textarea id="block2" name="block2" style="font-family:rockwell; background-color:#d1d1d1"></textarea>

try:

<script language="javascript">         var copytextareabtn = document.queryselector('.btn4');  copytextareabtn.addeventlistener('click', function(event) {   var copytextarea = document.queryselector('.block2');   copytextarea.select();    try {     var successful = document.execcommand('copy');     var msg = successful ? 'successful' : 'unsuccessful';     console.log('copying text command ' + msg);   } catch (err) {     console.log('oops, unable copy');   } }); </script>

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