JavaScript 排序函数，按日期降序和时间升序

Question

根据这些数据，我的排序函数将按日期、时间升序排序，并按名字的字母顺序排序:

[
  ['Kurt Asdf', '25 Nov 2017 4:30 PM'],
  ['Vincent Qwerty', '25 Nov 2017 4:30 PM'],
  ['Zed Jones', '24 Nov 2017 2:00 PM'],
  ['Jack Mo', '25 Nov 2017 5:00 PM'],
  ['John Phil', '25 Nov 2017 4:00 PM'],
  ['Bob Phil', '25 Nov 2017 4:00 PM']
]

这是我当前排序函数的输出(代码如下):

[
  ['Zed Jones', '24 Nov 2017 2:00 PM'],
  ['Bob Phil', '25 Nov 2017 4:00 PM'],
  ['John Phil', '25 Nov 2017 4:00 PM'],
  ['Kurt Asdf', '25 Nov 2017 4:30 PM'],
  ['Vincent Qwerty', '25 Nov 2017 4:30 PM'],
  ['Jack Mo', '25 Nov 2017 5:00 PM']
]

这是我想要的输出:

[
  ['Bob Phil', '25 Nov 2017 4:00 PM'],
  ['John Phil', '25 Nov 2017 4:00 PM'],
  ['Kurt Asdf', '25 Nov 2017 4:30 PM'],
  ['Vincent Qwerty', '25 Nov 2017 4:30 PM'],
  ['Jack Mo', '25 Nov 2017 5:00 PM'],
  ['Zed Jones', '24 Nov 2017 2:00 PM']
]

请注意，在上面的输出中，日期按降序排列，而时间按升序排列，并且每个时间段内的字母顺序保持不变。

这是我尝试过的:

function sortTable(data) {
  return data.sort((elem1, elem2) => {
    var dateA         = new Date(elem1[1])
      , dateB         = new Date(elem2[1])
      , nameA         = elem1[0]
      , nameB         = elem2[0]
      , datecomp      = dateB-dateA;

    if (nameA === undefined || nameB === undefined)
      namecomp = 0;
    else
      namecomp = nameA[0] > nameB[0] || -(nameA[0] < nameB[0]);

    return datecomp > 0 ? datecomp : datecomp + namecomp;
  });
}

Answer 1

您可以使用链式方法以不同的排序顺序对部件进行排序。

我建议使用单个函数来比较和返回订单。

您可以使用ISO 8601用于按日期降序和时间升序排序的字符串。稍后按名称升序排序。

Why taking an ISO 8601 date/time string?

The conversion of

25 Nov 2017 4:30 PM

returns a sortable string in the format of

2017-11-25T15:30:00.000Z ISO in GMT
^^^^^^^^^^               date
           ^^^^^^^^      time without milli seconds

From this we take the date part for sorting descending

2017-11-25

and the time part

15:30:00

for sorting ascending, if the date is the same.

More to read here: Sort ISO 8601 dates forward or backwards.

var array = [['Kurt Asdf', '25 Nov 2017 4:30 PM'], ['Vincent Qwerty', '25 Nov 2017 4:30 PM'], ['Zed Jones', '24 Nov 2017 2:00 PM'], ['Jack Mo', '25 Nov 2017 5:00 PM'], ['John Phil', '25 Nov 2017 4:00 PM'], ['Bob Phil', '25 Nov 2017 4:00 PM']];

array.sort(function (a, b) {
    function compare(a, b) {
        return a > b || -(a < b);
    }

    var aISO = new Date(a[1]).toISOString(),
        bISO = new Date(b[1]).toISOString();

    return compare(bISO.slice(0, 10), aISO.slice(0, 10))   // date desc
        || compare(aISO.slice(11, 19), bISO.slice(11, 19)) // time asc
        || compare(a[0], b[0]);                            // name asc
});

console.log(array);

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