[Retro_1477]

Вроде получилось, но выдаётся ошибка.

var el = document.getElementsByTagName('body')[0];


  el.addEventListener("touchstart", handleStart, false);
  el.addEventListener("touchend", handleEnd, false);

  //el.addEventListener("touchmove", handleMove, false);
  
  function handleStart(evt) {
    evt.preventDefault();
    var touches = evt.changedTouches;
    if(window.innerWidth/2 < touches[0].pageX)
      button1 = true;
      button2 = false;
    if(window.innerWidth/2 > touches[0].pageX){
      button2 = true;
      button1 = false
    }
  }
  function handleEnd(evt) {
    evt.preventDefault();
    var touches = evt.changedTouches;
    if(window.innerWidth/2 < touches[0].pageX)
      button1 = false;
      button2 = false;
    if(window.innerWidth/2 > touches[0].pageX){
      button2 = false;
      button1 = false
    }
  }

Вот такая ошибка
[Intervention] Unable to preventDefault inside passive event listener due to target being treated as passive. See https://www.chromestatus.com/features/5093566007214080