Javascript get result to html button

Hello all, As a new thing I am trying to learn (some simple JS scripting) I was following this example: https://www.sitepoint.com/create-qr... So as I am figuring this out, I do not get the "Go" button to work. How do I put the result of the scan (URL) to that button and open it with something like 'window.location.relocate' ? Pretty a noob with JS for the moment. Any hints ? Thanks

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