}
    });
  });
  const randomCell = emptyCells[Math.floor(Math.random() * emptyCells.length)];
  data[randomCell[0]][randomCell[1]] = 2;
}
function draw() { // 표에 16개 칸 그리기
  data.forEach((rowData, i) => {
    rowData.forEach((cellData, j) => {
      const $target = $table.children[i].children[j];
      if (cellData > 0) {
        $target.textContent = cellData;
        $target.className = 'color-' + cellData;
      } else {
        $target.textContent = '';
        $target.className = '';
      }
    });
  });
}
startGame();
</script>
</body>
</html>