Question

let notesInfo = []

if (_.isArray(result)) {
  console.log(result, '-----------');
  notesInfo = _.sortBy(result, ['modifiedDate']);
} else {
  notesInfo = result;
}

console.log(notesInfo)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.js"></script>

我正在使用此代码根据创建的日期和时间显示注释。最新添加的注释应使用lodash的sortBy方法放在顶部。如何实现呢？预先感谢。

Answer 1

如果您要首先获取最新的项目，而其余的则按升序排列，则可以按升序正常排序。由于最后一个元素是最新元素，因此可以使用Array#pop和Array#unshift将其旋转到数组的前面：

let result = [
  { modifiedDate: "2019-02-01", name: "february" },
  { modifiedDate: "2019-04-01", name: "april" },
  { modifiedDate: "2019-01-01", name: "january" },
  { modifiedDate: "2019-03-01", name: "march" }
];

//sort ascending
let notesInfo = _.sortBy(result, ['modifiedDate']);

//take the most recent (last)
var lastElement = notesInfo.pop();

//place it first
notesInfo.unshift(lastElement);

console.log(notesInfo);

<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.15/lodash.min.js"></script>

如果您希望项目按降序排列，则应使用_.orderBy而不是_.sortBy：

let result = [
  { modifiedDate: "2019-02-01", name: "february" },
  { modifiedDate: "2019-04-01", name: "april" },
  { modifiedDate: "2019-01-01", name: "january" },
  { modifiedDate: "2019-03-01", name: "march" }
];

//sort descending
let notesInfo = _.orderBy(result, ['modifiedDate'], ['desc']);

console.log(notesInfo);

<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.15/lodash.min.js"></script>

Answer 2

让我们假设这是您的数据：

 var result = [{
      name: "Mango",
      modifiedDate: "Mon Oct 10 2019 00:00:00 GMT-0700 (PDT)"
    }, {
      name: "Banana",
      modifiedDate: "Sun Oct 9 2019 00:00:00 GMT-0700 (PDT)"
    }, {
      name: "Kivi",
      modifiedDate: "Sat Oct 8 2019 00:00:00 GMT-0700 (PDT)"
    }];

原生Array.prototype.sort()

result.sort(function compare(a, b) {
  var dateA = new Date(a.modifiedDate);
  var dateB = new Date(b.modifiedDate);
  return dateA - dateB;
});

或者用lodash

output = _.sortBy(result, function(dateObj) {
  return new Date(dateObj.modifiedDate);
});

Answer 3

let notesInfo = []

if (_.isArray(result)) {
  console.log(result, '-----------');
  notesInfo = _.sortBy(result, ['modifiedDate']).reverse();
} else {
  notesInfo = result;
}

console.log(notesInfo)

这按预期工作。谢谢

Lodash _.sortBy基于创建的日期和时间

3 个答案: