Edit in JSFiddle

var map, player = { x: 1, y: 8 }, i, maze = document.getElementById('maze'), win;
function updateMap() {
    var displayMap = [], x, y;
    for (y = 0; y < map.length; y += 1) {
        displayMap[y] = displayMap[y] || [];
        for (x = 0; x < map[y].length; x += 1) {
            displayMap[y][x] = map[y][x];
        }
    }
    displayMap[player.y][player.x] = '@';
    for (y = 0; y < displayMap.length; y += 1) {
        displayMap[y] = displayMap[y].join('');
    }
    maze.innerHTML = displayMap.join('\n');
}
function playerMove(x, y) {
    var toX = player.x + x, toY = player.y + y;
    if (map[toY][toX] === '.' || map[toY][toX] === 'X') {
        player.x = toX;
        player.y = toY;
    }
    updateMap();
    if (map[toY][toX] === 'X') {
        maze.innerHTML = 'YOU WIN';
        document.getElementById('buttons').innerHTML = '';
    }
}
map = [
    'HHHHHHHHHH',
    'HH......XH',
    'HH.H.H.H.H',
    'HH.HHHHH.H',
    'H........H',
    'HHHHH.H.HH',
    'H...H.H.HH',
    'H.H...H.HH',
    'H.H.HHH.HH',
    'HHHHHHHHHH'
    ];
for (i = 0; i < map.length; i += 1) {
    map[i] = map[i].split('');
}
document.getElementById('button-north').onclick = function () {
    playerMove(0, -1);
};
document.getElementById('button-south').onclick = function () {
    playerMove(0, 1);
};
document.getElementById('button-east').onclick = function () {
    playerMove(1, 0);
};
document.getElementById('button-west').onclick = function () {
    playerMove(-1, 0);
};
updateMap();

<pre id="maze"></pre>
<div id="buttons">
    <button id="button-north">NORTH</button>
    <button id="button-west">WEST</button>
    <button id="button-east">EAST</button>
    <button id="button-south">SOUTH</button>
</div>