JS TutorialLesson 2Free preview

JS Where To

This lesson is part of JavaScript · All levels

Summary

JavaScript can be written directly into HTML using the <script> tag or separated into an extensive .js file loaded with the src attribute. External code separation makes files more neat, easier to cache in a browser, and easier to share with multiple pages. Positions and attributes such as defer and async determine when a script is executed relative to the page parsing process.

Key points

<script> tags are used to write or load JavaScript in HTML
External script is loaded with <script src='app.js'></script>
The defer attribute delays execution until the HTML parsing is complete, while the async runs the script once it is completed downloading
Put the script at the end of <body> so that the elements are already available when the code is running

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