var i=0;
var update = null;
function timedCount(){

  onmessage = (e) => {


    if(e.data[0] == "on"){
      update = "1";
    }

    if(e.data[0] == "off"){
      clearInterval(update);
    }
    if(e.data[0] == "changespeed"){
      if(update){
        clearInterval(update);
        if(e.data[1] == 0){

        }else{
          let speed = 900/e.data[1];
          update = setInterval("stationupdate()", speed);
        }

      }

    }
}


}
function stationupdate(){

  postMessage("up");
}

timedCount();