image.png

    1. <body>
    2.  <script>
    3.    var age = 20
    4.  </script>
    5. </body>
    <body>
 <script type="text/javascript" src="./itbaizhan.js">   
 </script>
</body>

    <body>
 <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js">
 </script>
</body>