Как сделать переключение управления с помощью javascript и html?

var heldDown = {}; 
this.move = function(keyCode_start) {
var nextY = this.y;
if(keyCode_start == 40) {
nextY += 5;
this.speedModifer = 1.5;
} else if(keyCode_start == 38) {
nextY += -5;
this.speedModifier = 1.5;
} else {
this.speedModifier = 0;
}
nextY = nextY < 0 ? 0 : nextY;
nextY = nextY + this.height > 900 ? 900 - this.height : nextY;
this.y = nextY;
};
}
for(var keyCode_start in heldDown) {
player.move(keyCode_start);
}
function control_change() {
  document.getElementById("myDropdown").classList.toggle("show");
}
window.onclick = function(event) {
  if (!event.target.matches('.dropbtn')) {
    var dropdowns = document.getElementsByClassName("dropdown-content");
    var i;
    for (i = 0; i < dropdowns.length; i++) {
      var openDropdown = dropdowns[i];
      if (openDropdown.classList.contains('show')) {
        openDropdown.classList.remove('show');
      }
    }
  }
}
window.addEventListener("keydown", function(keyInfo) { heldDown[event.keyCode_start] = true; }, false);window.addEventListener("keyup", function(keyInfo) { delete heldDown[event.keyCode_start]; }, false);
tick(); 
function  toggle(ws_change){
  ws_change.addEventListener.innerHTML('click', () => {
    keyCode_start.disabled=true;
    this.move = function(keyCode_ws) {
      var nextY = this.y;
      if(keyCode_ws == 87) {
      nextY += 5;
      this.speedModifer = 1.5;
    } else if(keyCode_ws == 83) {
    nextY += -5;
    this.speedModifier = 1.5;
  } else {
  this.speedModifier = 0;
}
nextY = nextY < 0 ? 0 : nextY;
nextY = nextY + this.height > 900 ? 900 - this.height : nextY;
this.y = nextY;
for(var keyCode_ws in heldDown) {
  player.move(keyCode_ws);
}
window.addEventListener("keydown", function(keyInfo) { heldDown[event.keyCode_ws] = true; }, false);window.addEventListener("keyup", function(keyInfo) { delete heldDown[event.keyCode_ws]; }, false);
tick();
};
});
};
function toggle(arrows_change){
  arrows_change.addEventListener.innerHTML('click', () => {
    keyCode_start.disabled=true;
    this.move = function(keyCode_arrows) {
      var nextY = this.y;
      if(keyCode_arrows == 40) {
      nextY += 5;
      this.speedModifer = 1.5;
    } else if(keyCode_arrows == 38) {
    nextY += -5;
    this.speedModifier = 1.5;
  } else {
  this.speedModifier = 0;
}
nextY = nextY < 0 ? 0 : nextY;
nextY = nextY + this.height > 900 ? 900 - this.height : nextY;
this.y = nextY;
for(var keyCode_arrows in heldDown) {
  player.move(keyCode_arrows);
}
window.addEventListener("keydown", function(keyInfo) { heldDown[event.keyCode_arrows] = true; }, false);window.addEventListener("keyup", function(keyInfo) { delete heldDown[event.keyCode_arrows]; }, false);
tick();
};
});
};
</script>