4. Using JS #

Created Wednesday 08 July 2020

In the browser #

There are 2 ways to add JS code:

Add it as content of the script tag.

<!-- Method 1, direct -->
<body>
<script> var x = 2; </script>
<body>

Add code from a .js file using src attribute. script is still a content tag.

<!-- Method 2, src -->
<body>
<script src="path"></script> <!-- Leave tag content empty -->
<body>

Note:

Keep the script tag at the end of the body tag, and never in the head. Reason: Executing/downloading script content blocks the rendering process. Or, add the defer attribute to the script tag, place it anywhere now.

In the browser, you may use objects like window, but this is an error in the terminal.
UI APIs like document are also absent.