JavaScript游戏结束提醒？

Question

我用箭头移动和硬币创建了一个可运行的迷宫，但是试图显示一条一旦用户收集了全部6个奖励就会出现的消息，就会破坏游戏。

我试图从github复制某人的警报，并尽我所能将其应用到我的工作中，但是它只是打破了画布，浏览器中实际上没有任何显示。

我的代码如下：

character = {
  x: 6,
  y: 4
}

var el = document.getElementById('game');

function drawWorld() {
  el.innerHTML = '';
  for (var y = 0; y < map.length; y = y + 1) {
    for (var x = 0; x < map[y].length; x = x + 1) {
      if (map[y][x] === 1) {
        el.innerHTML += "<div class='borders'></div>";
      } else if (map[y][x] === 2) {
        el.innerHTML += "<div class='reward'></div>";
      } else if (map[y][x] === 3) {
        el.innerHTML += "<div class='ground'></div>";
      } else if (map[y][x] === 5) {
        el.innerHTML += "<div class='character'></div>";
      }
    }
    el.innerHTML += "<br>";
  }

  winGame();
}

function winGame() {
  if (!map[5].includes(2))
    alert("Well done!");
}


drawWorld();

document.onkeydown = function(event) {
  if (event.keyCode === 37) {
    if (map[character.y][character.x - 1] !== 1) {
      map[character.y][character.x] = 3;
      character.x = character.x - 1;
      map[character.y][character.x] = 5;
      drawWorld();
    }
  } else if (event.keyCode === 38) {
    if (map[character.y - 1][character.x] !== 1) {
      map[character.y][character.x] = 3;
      character.y = character.y - 1;
      map[character.y][character.x] = 5;
      drawWorld();
    }
  } else if (event.keyCode === 39) {
    if (map[character.y][character.x + 1] !== 1) {
      map[character.y][character.x] = 3;
      character.x = character.x + 1;
      map[character.y][character.x] = 5;
      drawWorld();
    }
  } else if (event.keyCode === 40) {
    if (map[character.y + 1][character.x] !== 1) {
      map[character.y][character.x] = 3;
      character.y = character.y + 1;
      map[character.y][character.x] = 5;
      drawWorld();
    }
  }

  console.log(map)

}