Untitled

<!DOCTYPE html>
<html>
<head>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
    <title></title>
    <style>
    td {
    width: 30px;
    height: 30px;
    border: 1px solid black;
    cursor: pointer;
    text-align: center;
}
    </style>
</head>
<body>

<table id="myTable">
    <tr>
        <td></td>
        <td></td>
        <td></td>
    </tr>
    <tr>
        <td></td>
        <td></td>
        <td></td>
    </tr>
    <tr>
        <td></td>
        <td></td>
        <td></td>
    </tr>
</table>

<script>
      var pos =
        [
            [[0,0],[0,1],[0,2]], //1 строка
            [[1,0],[1,1],[1,2]], //2 строка
            [[2,0],[2,1],[2,2]], //3 строка

            [[0,0],[1,0],[2,0]], //1 столбец
            [[0,1],[1,1],[2,1]], //2 столбец
            [[0,2],[1,2],[2,2]], //3 столбец
        ];

    function check() {
        var table = document.getElementById("myTable");
        var flag;

        for(var i = 0; i < pos.length; i++){
            var win = true;
            for(var k = 0; k < pos[i].length; k++){
                if(table.rows[pos[i][k][0]].cells[pos[i][k][1]].innerHTML !== 'X' && table.rows[pos[i][k][0]].cells[pos[i][k][1]].innerHTML !== 'O' )
                    win = false;
            }

            if(win){
                flag = true;
                break;
            }
        }

        if (flag) {
          alert("победа");
        }
    }

    var tds = document.getElementsByTagName('td');
    for(var i = 0; i < tds.length; i++){
        tds[i].addEventListener('click', function(){
            if(this.innerHTML !== 'X'){
                this.innerHTML = 'X';
            }
             else {
                this.innerHTML = '';
            }
            check();
        })
    }
      for(var i = 0; i < tds.length; i++){
        tds[i].addEventListener('click', function(){
            if(this.innerHTML !== 'O'){
                this.innerHTML = 'O';
            }
             else {
                this.innerHTML = '';
            }
            check();
        })
    }
</script>
</body>
</html>