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

  onmessage = (e) => {
    if(e.data.type){
      for(let i=e.data.body.length-1;i>=0;i--){

        postMessage(e.data.body[i]);
      }
    }


    if(e.data == "on"){

      update = setInterval("uptrain()", 50);
    }

    if(e.data == "off"){
      clearInterval(update);
    }
}


}
function uptrain(){

  postMessage(i);
}

timedCount();