How to determine the Opera browser using JavaScript

Question

I want to determine that the browser of the client machines in Opera or not using JavaScript, how to do that?

Answer 1

do you mind using jQuery?

then you can use jQuery.browser (see documnentation)

But the jQuery-guys recommend not to use this.

We recommend against using this property, please try to use feature detection instead (see jQuery.support)

Edit:

For Mootools: use window.opera (see documentation)