Learn-JS/task.html at master · hisni/Learn-JS · GitHub

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<!DOCTYPE html>
<html lang="en" dir="ltr">
  <head>
    <meta charset="utf-8">
    <title>Hackers' Club JS Session</title>
  </head>
  <body>
    <input id="first_name_text" placeholder="Enter first name"/>
    <input id="last_name_text" placeholder="Enter last name" />
    <button onclick="swap()"> Swap Names </button>
  </body>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

  <script type="text/javascript">

    function swap(){
      /*var first = document.getElementById('first_name_text').value;
      var last = document.getElementById('last_name_text').value;

      document.getElementById('first_name_text').value = last;
      document.getElementById('last_name_text').value = first;
      */
      var first = $('#first_name_text').val();
      var last =  $('#last_name_text').val();
      $('#first_name_text').val(last);
      $('#last_name_text').val(first);
    }

  </script>
</html>