如何通过星期几提前获得最近的日期？

Question

我是新手，我需要提前一周中的第几天获得最近的日期。

根据当前日期，我需要获取，例如：

const currentWeekDay = '4'; (14.04)
const preparedAlternativeDates = [
  { DAY: 1, VALUE: '18.04' },
  { DAY: 2, VALUE: '19.04'},
  { DAY: 3, VALUE: '20.04'},
  { DAY: 4, VALUE: '21.04'},
  { DAY: 5, VALUE: '15.04'},
  { DAY: 6, VALUE: '16.04'},
  { DAY: 7, VALUE: '17.04'},
];

我正在尝试使用下面的脚本，但它不起作用。也许有更简单的方法来做到这一点？

const ALTERNATIVE_DATES = Object.freeze([
  { DAY: 1, VALUE: null },
  { DAY: 2, VALUE: null },
  { DAY: 3, VALUE: null },
  { DAY: 4, VALUE: null },
  { DAY: 5, VALUE: null },
  { DAY: 6, VALUE: null },
  { DAY: 7, VALUE: null },
]);

const preparedAlternativeDates = ALTERNATIVE_DATES.map((alternativeDate: any) => {
  if (!alternativeDate.VALUE) {
    const alternativeDateDay = Number(alternativeDate.DAY);
    const currentWeekDay = Number(moment().isoWeekday());

    if (alternativeDateDay <= currentWeekDay) {
      alternativeDate.VALUE = moment().add(alternativeDateDay + currentWeekDay - 1, 'd').startOf('day');
    } else {
      alternativeDate.VALUE = moment().add(alternativeDateDay - currentWeekDay, 'd').startOf('day');
    }
  }

  return {
    day: alternativeDate.DAY,
    value: alternativeDate.VALUE
  };
});

如有任何帮助，我将不胜感激。

Answer 1

我刚刚调整了你的代码并测试了结果。这应该适合你：

const ALTERNATIVE_DATES = Object.freeze([
     { DAY: 1, VALUE: null },
     { DAY: 2, VALUE: null },
     { DAY: 3, VALUE: null },
     { DAY: 4, VALUE: null },
     { DAY: 5, VALUE: null },
     { DAY: 6, VALUE: null },
     { DAY: 7, VALUE: null },
  ]);

  const preparedAlternativeDates = ALTERNATIVE_DATES.map((alternativeDate: any) => {
     if (!alternativeDate.VALUE) {
        const wishedDay = Number(alternativeDate.DAY);
        const today = moment().isoWeekday();

        if (today < wishedDay) {
           alternativeDate.VALUE = moment().isoWeekday(wishedDay).format('DD.MM');
        } else {
           alternativeDate.VALUE = moment().add(1, 'weeks').isoWeekday(wishedDay).format('DD.MM');
        }
     }

     return {
        day: alternativeDate.DAY,
        value: alternativeDate.VALUE,
     };
  });

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