구구단

s70_1_0.js

for (var i = 1; i <= 9; i++) {
  for (var j = 1; j <= 9; j++) {
    console.log(i, 'X', j, '=', i * j);
  }
}

eachDan(7);
for (var i = 8; i <= 18; i += 2) eachDan(i);

printDan([3, 7, 9, 13]);
rangeDan(1, 9);

var eachDan = function(n) {
  for (var i = 1; i <= 9; i++) {
    console.log(n, 'X', i, '=', n * i);
  }
};

var printDan = function(dan) {
  for (var i = 0; i < dan.lenght; i++) {
    eachDan(dan[i]);
  }
};

var rangeDan = function(min, max) {
  var arr = [];

  for (var i = min; i <= max; i++) arr.push(i);

  printDan(arr);
};