You can refer below url for

pwhlicia — Mon, 25 Mar 2013 14:47:42 +0000

You can refer below url for more details :-

http://www.patrick-wied.at/blog/a-technique-for-hiding-your-javascript-code

The js runs on the client

John Harris — Sun, 04 Nov 2012 16:12:38 +0000

The js runs on the client machine. That's why you have to send the code to the client machine, for it to be run. The client can display the page source and you can't stop that. Even if you could instruct the browser not to, tools like wget can pretend to be a valid browser and put the full webpage image onto a client text file, including the js.

The best you can do is to make the js as unreadable to humans as possible, maybe with the Online Javascript Compression Tool or something like it. The js will still run but it will be harder to comprehend. The functionality can still be patched and re-used but it can't be re-commented, and your meaningful data names will be lost.