How do I made saving of a record?

I made a simple game in which you should set a record but when I close my game on iPhone and run it again, the record reseted. How can I made saving of a record? Also building my game with Cordova I use function for "Hide status bar" but it doesnt work. How can I hide status bar in a game?

Im using cordova build and Intel XDK.

To save record use WebStorage. To hide status bar enable Fullscreen in XDK.

enable Fullscreen in XDK.

Thank you for information about WebStorage. But I cant hide statusbar. I have enabled Fullscreen in XDK and nothing changed. What is wrong?

Did you uncheck StatusBar plugin in XDK?

Did you uncheck StatusBar plugin in XDK?

Of course no. I will do this.