Best to read through the steps on the Quick Start - I know they don't all apply to ESP8266 (there's no 'LED' constant built in) but it doesn't take long and would answer a lot of questions you might have.
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.
As the others have said,
save()
is the key here.Best to read through the steps on the Quick Start - I know they don't all apply to ESP8266 (there's no 'LED' constant built in) but it doesn't take long and would answer a lot of questions you might have.