Facing issue with the javascript codes

the led or buzzer or proximity program made using javascript is not working.
i keep pressing the on or off or read button and nothing works
i think the bolt.js isnt getting uploaded.

There are a few ways of checking what the issue is.
1st -> which browser are you using?
2nd -> you can right click on the page and select inspect / inspect element and view what is happening in the background. Reload the page and see if any errors are printed on the console.

Also share your code here.