function createMatrix(rows, columns) {
    if (rows !== columns) return "rows number not equals columns number!";
    var matrix = new Array(rows);

    for (var i = 0; i < rows; i++) {
        matrix[i] = new Array(columns);
        for (var j = 0; j < columns; j++) {
            matrix[i][j] = 3;
        }
    }

    for (var i = 0, j = 0; i < rows, j < columns; i++, j++) {
        matrix[i][j] = 1;
        for (var k = 0; k < i; k++) {
            matrix[i][k] = 8;
        }
    }


    return matrix;
}
console.log(createMatrix(5, 5));