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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Yes, absolutely. You might find this helpful: http://www.espruino.com/Data+Collection
It shows you how to store data and also how to connect and get it back using a Web Bluetooth webpage.
But basically you can store to RAM which is easy and will likely work well enough for you, or you can write to Flash memory so the data persists even after power off.