thank you for your view. I am having poblem with Opera browser like this.

I coded a very simple program (javascript) like this

console.log('fullName');

and want to display it to the console, but when I click Ctrl + Shift + I (I am using Opera), here I got, as you can see by this picture picture about the console

It does not display the log "fullName" as I hope.

By the way, I also code anothe code like this

setInterval(function() {console.log('fullName')}, 1000)

instead of console.log, but it still nothing, as you can see

picture of (setInterval)

Could you please give me some advice to show the console ? Thank you very much for your time.