使用日期名称和日期以数组形式获取一个月中的周数

Question

我有一个代码可以在一个月内返回周的开始日期和结束日期，但我需要它返回整周的日期，日，月

月份从 0-11 开始

function getFullWeeksStartAndEndInMonth (month, year) {
    let weeks = [],
        firstDate = new Date(year, month, 1),
        lastDate = new Date(year, month + 1, 0),
        numDays = lastDate.getDate()

    let start = 1
    let end
    if (firstDate.getDay() === 1) {
        end = 7
    } else if (firstDate.getDay() === 0) {
        let preMonthEndDay = new Date(year, month, 0)
        start = preMonthEndDay.getDate() - 6 + 1
        end = 1
    } else {
        let preMonthEndDay = new Date(year, month, 0)
        start = preMonthEndDay.getDate() + 1 - firstDate.getDay() + 1
        end = 7 - firstDate.getDay() + 1
        weeks.push({
            start: start,
            end: end
        })
        start = end + 1
        end = end + 7
    }
    while (start <= numDays) {
        weeks.push({
            start: start,
            end: end
        });
        start = end + 1;
        end = end + 7;
        end = start === 1 && end === 8 ? 1 : end;
        if (end > numDays && start <= numDays) {
            end = end - numDays
            weeks.push({
                start: start,
                end: end
            })
            break
        }
    }
    return weeks
}

如何获得完整的星期日期+日期+月份，而不仅仅是这样的开始和结束日期

0: {date:30,month:"May",day:"Monday"},{date:31,month:"May",day:"Tuesday"},{date:1,month:"June",day:"Wednesday"},...

Answer 1

干得好

如果您需要任何解释，请告诉我，这只是一个简单的 .map，它会在一周内输出七个包含所需信息的对象

目前，它是一个嵌套数组 - 外部数组中的每个项目都是一个一周的数组

如果你想展平它，取消注释.flat(Infinity)

 function getFullWeeksStartAndEndInMonth (month, year) { let weeks = [], firstDate = new Date(year, month, 1), lastDate = new Date(year, month + 1, 0), numDays = lastDate.getDate() let start = 1 let end if (firstDate.getDay() === 1) { end = 7 } else if (firstDate.getDay() === 0) { let preMonthEndDay = new Date(year, month, 0) start = preMonthEndDay.getDate() - 6 + 1 end = 1 } else { let preMonthEndDay = new Date(year, month, 0) start = preMonthEndDay.getDate() + 1 - firstDate.getDay() + 1 end = 7 - firstDate.getDay() + 1 weeks.push({ start: start, end: end }) start = end + 1 end = end + 7 } while (start <= numDays) { weeks.push({ start: start, end: end }); start = end + 1; end = end + 7; end = start === 1 && end === 8 ? 1 : end; if (end > numDays && start <= numDays) { end = end - numDays weeks.push({ start: start, end: end }) break } } // *** the magic starts here return weeks.map(({start, end}, index) => { const sub = +(start > end && index === 0); return Array.from({length: 7}, (_, index) => { const date = new Date(year, month - sub, start + index); return { date: date.getDate(), month: date.toLocaleString('en', {month: 'long'}), day: date.toLocaleString('en', {weekday: 'long'}), }; }); })//.flat(Infinity); } console.log(getFullWeeksStartAndEndInMonth(6, 2022))

Answer 2

OP中的输出示例：

0: {date: 30, month: "May", day: "Monday"},
   {date: 31, month: "May", day: "Tuesday"},
   {date: 1, month: "June", day: "Wednesday"},...

0:意味着它右边的所有东西都是数组的第一个元素。 如果是这样，那么它需要括号[] ，或者它是一个需要引号“”的字符串。 在 OP 中，结果看起来像一个数组，其中包含另一个包含对象的数组。 外部数组是没有意义的。 提供的示例返回一个对象数组，这是最常用的数据结构之一：

[
  {date: 26, month: "May", day: "Thursday"},
  {date: 27, month: "May", day: "Friday"},
  {date: 28, month: "May", day: "Saturday"},
  {date: 29, month: "May", day: "Sunday"},...
]

细节在例子中注释

 /** * @desc Given a start string date and an end string date, return * each day as an object consisting of {date, month, weekday} * in an array * @param {string<date>} from - A string in this format yyyy-mm-dd * @param {string<date>} to - See previous * @return {array<object>} An array of objects with the following: * {date: {number}, month: {string}, day: {string}} */ function dateRange(from, to) { // Convert the parameters into Date objects const start = new Date(from) const end = new Date(to); // Define array to return let range = []; /* While the start date is less than or equal to the end date... ...get a new date object setting it's date number ahead by 1... ...next get the new date... ...then the long version of the month... ...and then the long version of the weekday... ...create an object with those values matched to these keys: date, month, day... ...add the object to the range array */ while(start <= end) { const next = new Date(start.setDate(start.getDate()+1)); const date = next.getDate(); const month = next.toLocaleString('default', {month: 'long'}); const day = next.toLocaleString('default', {weekday: 'long'}); const dayObj = Object.assign({}, {date: date, month: month, day: day}); range.push(dayObj); } // After the while loop, return the range array return range; } console.log(dateRange('2022-05-26', '2022-06-12'));