function Board(rows, cols) {
      this.rows = rows;
      this.cols = cols;
    }

    Board.prototype.drawBoard = function () {
      var board = document.createElement('div');
      board.className = "board";

      for (var i = 0; i < this.rows; i++) {
        var row = document.createElement('div');
        row.className = "row";

        for (var j = 0; j < this.cols; j++) {
          var element = document.createElement('div');
          element.className = "element";
          row.appendChild(element);
        }

        board.appendChild(row);
      }

      document.body.appendChild(board);
    };

    var board = new Board(3, 3);
    board.drawBoard();