function getNumbersList(elements, count) {
  var a;
  var numbersList = [];
  --count;
  for (a = 0; a < elements.length; a++) {
    if (count == 0) {
    	numbersList.push(elements[a]);
    } else {
      var dupplicatedElements = elements.slice();
      var first = dupplicatedElements.splice(a, 1);
      var recursiveList = getNumbersList(dupplicatedElements, count);
      for (b = 0; b < recursiveList.length; b++) {
      	numbersList.push(first.toString() + recursiveList[b].toString());
      }
    }
  }
  return numbersList;
}

var elements = [1, 2, 3, 4, 5, 6, 7, 8, 9];
var numbersList = getNumbersList(elements, 9);

var answerList = [];
for (i = 0; i < numbersList.length; i++) {
  var numbers = numbersList[i];
  abc = parseInt(numbers.substring(0, 3));
  de = parseInt(numbers.substring(3, 5));
  fghi = parseInt(numbers.substring(5, 9));
  if (abc * de == fghi) {
    answerList.push(numbers);
  }
}

for (i = 0; i < answerList.length; i++) {
  document.querySelector("#test_result").innerHTML += answerList[i] + "
";
}