Im learning JS. Found a good video "JavaScript Programming - Full Course" and stucked at the 2nd part where I need to use DOM. I have the HTML document, in i refered to the JS file. Other stuff working well, but this:

let messageEL = document.getElementById("message-el")

Always get this error:

ReferenceError: document is not defined

I installed live server, and it works one time, than stops.

What can I do, to fix this? Do I need to download some extension? Please tell me the solution as simple as u can Im at the beginning of the learning path.

This is the code and the error

CodePudding user response：

In your screenshot, you're attempting to run the script using Node.js (the server-side JavaScript executable).

Since you say you're running live-server, you should be looking at your browser instead, not trying to run your code via Node.