javascript - 12 月年份错误的月份列表

Question

$("select").change(function() {
  //var date = "2017-04-06"
  //var date = "2017-01-06"
  $(".appendhere").empty();
  var date = $("option:selected",this).text();
  var monthnumber = date.split("-")[1] - 1;
  var yearnumber = date.split("-")[0];
  var months = 12;
  var m_names = new Array("January", "February", "March",
    "April", "May", "June", "July", "August", "September",
    "October", "November", "December");
  for (var i = months - 1; i >= 0; i--) {
    var div = $('<div class="row" style="margin-top:6px;"><div class="col-md-6"><label class="col-md-6 col-form-label">' + yearnumber + " " + m_names[monthnumber] + '</label></div>');
    $(".appendhere").append(div)
    monthnumber == 11 ? monthnumber = 0 : monthnumber++;
    m_names[monthnumber] == "December" ? yearnumber++ : yearnumber + 0;
  }

}).change();

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select>

<option>2017-04-06</option>
<option>2017-01-06</option>
</select>

<div class="appendhere"></div>

更改选择时，我想根据选择的日期附加月份和年份。

我可以添加月份和年份，但问题是 12 月的年份总是比当年早 1 年。

我知道这是小细节，但我无法指出我哪里做错了。

Answer 1

在条件运算符处用“January” 替换“December”。

m_names[monthnumber] == "January" ? yearnumber++ : yearnumber + 0;