How to inject JavaScript into iframe tag

in this example we learn how to isert javascript function inside iframe.

 <p><button id="btn">run js</button></p>
<iframe id="iframe"></iframe>
<script type="text/javascript">
 document.getElementById("btn").addEventListener('click',
  function runcode(){
  var js_code="<script>document.write('hello')</\script>"
   var doc = document.getElementById('iframe').contentWindow.document;
   doc.open();
   doc.write(js_code);
   doc.close();
  });
</script>

 <p><button id="btn">run js</button></p>
<iframe id="iframe"></iframe>
<script type="text/javascript">
 document.getElementById("btn").addEventListener('click',
  function runcode(){
  var js_code="<script>document.write('hello')</\script>"
   var doc = document.getElementById('iframe').contentWindow.document;
   doc.open();
   doc.write(js_code);
   doc.close();
  });
</script>

How to inject JavaScript into iframe tag

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