按iso字符串降序排序不起作用

Question

期望的行为

按对象的iso_string属性对对象数组进行排序,降序.

实际行为

数组顺序不会更改.

我试过的

我必须在某个地方犯了一个简单的错误,因为多个帖子确认这是正确的sort()语法.

iso_string值生成new Date().toISOString();

var dates = [{
  "formatted_date": "22/09/2018 @ 04:02pm",
  "iso_string": "2018-09-22T06:02:22.485Z"
}, {
  "formatted_date": "22/09/2018 @ 04:12pm",
  "iso_string": "2018-09-22T06:12:04.471Z"
}, {
  "formatted_date": "22/09/2018 @ 04:05pm",
  "iso_string": "2018-09-22T06:05:45.818Z"
}, {
  "formatted_date": "22/09/2018 @ 04:00pm",
  "iso_string": "2018-09-22T06:00:46.954Z"
}, {
  "formatted_date": "22/09/2018 @ 03:56pm",
  "iso_string": "2018-09-22T05:56:13.968Z"
}];

var sorted_dates = dates.sort(function(a, b) {
  return b.iso_string - a.iso_string;
});

console.log(sorted_dates);

编辑: 我包装了值new Date()并正确排序.

Answer 1

iso_string是字符串类型，需要将其转换为日期，然后排序。这是一个改进的示例

var dates = [{
  "formatted_date": "22/09/2018 @ 04:02pm",
  "iso_string": "2018-09-22T06:02:22.485Z"
}, {
  "formatted_date": "22/09/2018 @ 04:12pm",
  "iso_string": "2018-09-22T06:12:04.471Z"
}, {
  "formatted_date": "22/09/2018 @ 04:05pm",
  "iso_string": "2018-09-22T06:05:45.818Z"
}, {
  "formatted_date": "22/09/2018 @ 04:00pm",
  "iso_string": "2018-09-22T06:00:46.954Z"
}, {
  "formatted_date": "22/09/2018 @ 03:56pm",
  "iso_string": "2018-09-22T05:56:13.968Z"
}];
var sorted_dates = dates.sort(function(a, b) {
  return new Date(b.iso_string) - new Date(a.iso_string);
});
console.log(sorted_dates);

您还可以使用localCompare()而不将字符串转换为日期。

var dates = [{
  "formatted_date": "22/09/2018 @ 04:02pm",
  "iso_string": "2018-09-22T06:02:22.485Z"
}, {
  "formatted_date": "22/09/2018 @ 04:12pm",
  "iso_string": "2018-09-22T06:12:04.471Z"
}, {
  "formatted_date": "22/09/2018 @ 04:05pm",
  "iso_string": "2018-09-22T06:05:45.818Z"
}, {
  "formatted_date": "22/09/2018 @ 04:00pm",
  "iso_string": "2018-09-22T06:00:46.954Z"
}, {
  "formatted_date": "22/09/2018 @ 03:56pm",
  "iso_string": "2018-09-22T05:56:13.968Z"
}];

var sorted_dates = dates.sort((a, b)=>b.iso_string.localeCompare(a.iso_string));
console.log(sorted_dates);

Answer 2

由于您的ISO 8601日期可以按字典顺序排序,因此您可以使用string.localCompare()它进行排序.

var dates = [{ "formatted_date": "22/09/2018 @ 04:02pm", "iso_string": "2018-09-22T06:02:22.485Z" }, { "formatted_date": "22/09/2018 @ 04:12pm", "iso_string": "2018-09-22T06:12:04.471Z" }, { "formatted_date": "22/09/2018 @ 04:05pm", "iso_string": "2018-09-22T06:05:45.818Z"}, { "formatted_date": "22/09/2018 @ 04:00pm", "iso_string": "2018-09-22T06:00:46.954Z" }, { "formatted_date": "22/09/2018 @ 03:56pm", "iso_string": "2018-09-22T05:56:13.968Z" }],
    sorted_dates = dates.sort((a, b) => b.iso_string.localeCompare(a.iso_string));

console.log(sorted_dates);

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