javascript source code reuse

I am not familiar with javascript and I have had some exposure to java but I found a web application that fits the goals of my app perfectly. The owner has provided the source by viewing the source in the html and I was wondering how hard it would be to reuse the code to 开发者_如何学Godeploy a similar app.

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I have no idea what is your question, but:

• "I have had some exposure to java": Javascript has nothing to do with java except the name
• "The owner has provided the source by viewing the source in the html": Javascript is always visible from the client side, so it might not be intention of the owner to share it into other projects
• Reusing dificulty will depend on how good can you read his code and if it is accessing any server via ajax to fetch code or if it is generating code on the fly.