var m = Math.round(Math.random() *(10 - 1) + 1),
    n = Math.round(Math.random() *(10 - 1) + 1),
    arr = new Array(),
    sum = 0,
    max;
    for (var i = 0; i < m; i++) {
        arr[i] = i;
        for (var j = 0; j < n; j++) {
          arr[i][j] = j;
        }
    }
    console.log(m, n);
    console.log(arr);