javascript - 不想只在 moment.js 中显示当前年份的年份

Question

我有这段代码可以将日期转换为可读的时间格式

$('time').each(function (i, e) {

        if ($(e).attr("class") == 'mtime') {

            var now = moment();
            moment.lang('en', {
                calendar : {
                    lastDay : '[Yesterday] LT',
                    sameDay : 'LT',
                    nextDay : '[Tomorrow,] LT',
                    lastWeek : 'ddd LT',
                    nextWeek : 'ddd LT',
                    sameElse : 'MMM D[/]YY' //something to do with this?
                }

            });

            var elem = $(e).attr('datetime');
            var time = moment($(e).attr('datetime'));
            var diff = now.diff(time, 'days');

            $(e).html(time.calendar());

        }

});

返回的输出:

<time class="mtime" datetime="2016-02-26 10:31:22" title="2016-02-26 10:31:22">Feb 26/16</time>

问题是如果是当前年份，我该如何隐藏年份。如果是去年，则将其格式化为“M/D/YY”。

预期输出:

- <time>Feb 26</time> <!--// current year -->
- <time>12/25/15</time> <!--// last year -->
- <time>8/1/14</time> <!--// last year -->

请大家多多指教!时间差

Answer 1

从 2.14.0 版本开始，我们可以将回调传递给特定的时刻上下文:

sameElse: function() {
  if (this.years() === now.years()) {
    return 'MMM D'
  } else {
    return 'M/D/YY';
  }
}

$('time').each(function(i, e) {
  if ($(e).attr("class") == 'mtime') {
    var now = moment();
    moment.lang('en', {
      calendar: {
        lastDay: '[Yesterday] LT',
        sameDay: 'LT',
        nextDay: '[Tomorrow,] LT',
        lastWeek: 'ddd LT',
        nextWeek: 'ddd LT',
        sameElse: function() {
          if (this.years() === now.years()) {
            return 'MMM D'
          } else {
            return 'M/D/YY';
          }
        }
      }
    });
    var elem = $(e).attr('datetime');
    var time = moment($(e).attr('datetime'));
    var diff = now.diff(time, 'days');
    $(e).html(time.calendar());
  }
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.14.1/moment.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<time class="mtime" datetime="2016-02-26 10:31:22"></time> <br />
<time class="mtime" datetime="2015-12-25 10:31:22"></time> <br />
<time class="mtime" datetime="2014-08-01 10:31:22"></time> <br />