02. Applying JavaScript

Applying JavaScript is easy - we can apply JavaScript both internally and externally.

Internal JavaScript

JavaScript code can be placed in between the <script> tag either the head or body elements of an HTML document.

<script>
  document.write("Hello world!");
</script> 

Here, we're writing the text "Hello world!" to the document. We'll learn all about the document object and its functions in the Document Object Model section.

If you plan on placeing JS code directly in your body, it's best to place it just before your </body> closing tag. This will improve page loading time since no HTML will be blocked by any of your scripts loading.

External JavaScript

It's best to keep your HTML clear of JavaScript code for readability and maintanability. An external .js file may be cached (saved on a user's computer for quick access), which can speed up page load times.

To link externally, make your external file's extension .js and link it to your document with the src attribute:

<script src="path/to/js/script.js"></script>

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