Summary

  • We use a <script> tag to add JavaScript code to a page.

  • Most of the time, we save complex script in a separate file such that the browser can download it once and store it in its cache for reuse.

  • The external script file can be inserted with <script src="path/to/script.js"></script>.

Tasks

  • Show an alert

    <!DOCTYPE html>
<html>
<body>
  <script>
    alert("I'm JavaScript!")
  </script>
</body>
</html>

  • Show an alert with an external script

    <!DOCTYPE html>
<html>
<body>
  <script src="./alert.js"></script>
</body>
</html>
    alert.js
    alert("I'm JavaScript!")

References