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                <div id="year">
    <option value="">西暦を選んで下さい</option>

<div id="result"></div>

<div class="memo">



                .memo {
  margin-top: 2em;
  border: 1px solid red;
  font-size: 14px;

.memo p {
  margin: 1.2em 1.4em;



(function() {
  var now = new Date();
  var thisYear = now.getFullYear();
  var year;
  for (i = thisYear; i > 1949; i--) {
    year = "<option value=" + i + ">" + i + "年</option>";
    $("#year select").append(year);

(function() {
  function getEto(inputYear) {
    var eto = ["さる", "とり", "いぬ", "いのしし", "ねずみ", "うし", "とら", "うさぎ", "たつ", "へび", "うま", "ひつじ"];
    var targetNum = inputYear % 12;
    return eto[targetNum];

  $("#year select").on("change", function() {
    var op = $(this).val();
    if (op > 0) {
      var text = op + "年の干支は" + getEto(op) + "年です";