Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Development Tools Introduction to Front End Performance Optimization Combine and Minify Assets Optimize JavaScript

Tony Gilem
Tony Gilem
189 Points
Posted by Tony Gilem
Tony Gilem
189 Points

Am I right

Does that mean that if the js file is on the bottom it will load for the user what is necessary to see, but in the meantime, it will still be loading before the user ever clicks on something javascript will be fully loaded that it will work?

1 Answer

Steven Parker
Steven Parker
231,275 Points
Steven Parker
Steven Parker
231,275 Points

In modern browsers, JavaScript loaded at the bottom of the page code will be loaded after the DOM is constructed in memory, but it will be run to completion before the page is rendered on the user's screen.

So when you see any buttons, all the JavaScript code (except anything asynchronous or event-driven) has already been done.