如何根据javascript中的日期填充周数
如何根据javascript中的日期填充周数
提问于 2020-05-02 16:36:58
我有如下数据：
************************************************************************************************
May - 2020
Date Week Week Count
Fri May 01 2020 00:00:00 GMT+0500 (Pakistan Standard Time) 18 1
Sat May 02 2020 00:00:00 GMT+0500 (Pakistan Standard Time) 18 1
Sun May 03 2020 00:00:00 GMT+0500 (Pakistan Standard Time) 18 1+2 = 3
Mon May 04 2020 00:00:00 GMT+0500 (Pakistan Standard Time) 19 1
Tue May 05 2020 00:00:00 GMT+0500 (Pakistan Standard Time) 19 1
Wed May 06 2020 00:00:00 GMT+0500 (Pakistan Standard Time) 19 1
Thu May 07 2020 00:00:00 GMT+0500 (Pakistan Standard Time) 19 1
Fri May 08 2020 00:00:00 GMT+0500 (Pakistan Standard Time) 19 1
Sat May 09 2020 00:00:00 GMT+0500 (Pakistan Standard Time) 19 1
Sun May 10 2020 00:00:00 GMT+0500 (Pakistan Standard Time) 19 1+6 = 7
Mon May 11 2020 00:00:00 GMT+0500 (Pakistan Standard Time) 20 1
Tue May 12 2020 00:00:00 GMT+0500 (Pakistan Standard Time) 20 1
Wed May 13 2020 00:00:00 GMT+0500 (Pakistan Standard Time) 20 1
Thu May 14 2020 00:00:00 GMT+0500 (Pakistan Standard Time) 20 1
Fri May 15 2020 00:00:00 GMT+0500 (Pakistan Standard Time) 20 1
Sat May 16 2020 00:00:00 GMT+0500 (Pakistan Standard Time) 20 1
Sun May 17 2020 00:00:00 GMT+0500 (Pakistan Standard Time) 20 1+6 = 7
Mon May 18 2020 00:00:00 GMT+0500 (Pakistan Standard Time) 21 1
Tue May 19 2020 00:00:00 GMT+0500 (Pakistan Standard Time) 21 1
Wed May 20 2020 00:00:00 GMT+0500 (Pakistan Standard Time) 21 1
Thu May 21 2020 00:00:00 GMT+0500 (Pakistan Standard Time) 21 1
Fri May 22 2020 00:00:00 GMT+0500 (Pakistan Standard Time) 21 1
Sat May 23 2020 00:00:00 GMT+0500 (Pakistan Standard Time) 21 1
Sun May 24 2020 00:00:00 GMT+0500 (Pakistan Standard Time) 21 1+6 = 7
Mon May 25 2020 00:00:00 GMT+0500 (Pakistan Standard Time) 22 1
Tue May 26 2020 00:00:00 GMT+0500 (Pakistan Standard Time) 22 1
Wed May 27 2020 00:00:00 GMT+0500 (Pakistan Standard Time) 22 1
Thu May 28 2020 00:00:00 GMT+0500 (Pakistan Standard Time) 22 1
Fri May 29 2020 00:00:00 GMT+0500 (Pakistan Standard Time) 22 1
Sat May 30 2020 00:00:00 GMT+0500 (Pakistan Standard Time) 22 1
Sun May 31 2020 00:00:00 GMT+0500 (Pakistan Standard Time) 22 1+6 = 7
***********************************************************************************************我喜欢根据每周发生的情况来安排它:所以最终的结果是：
18=>3, 19=>7, 20=> 7, 21=>7, 22=>7因此，在5月份，第18周出现了1次，但在2020年5月的第18周，有3个日期被占用。同样，上述其他日期也是如此。
我正在尝试的代码是：
{
daysNumber.map((number, index) => {
let d = number.split('-');
NDate = new Date(d[0], d[1] - 1, d[2]);
weekNum = this.getWeekNumber(NDate);
})
}
getWeekNumber(now) {
let onejan = new Date(now.getFullYear(), 0, 1);
return Math.ceil((((now - onejan) / 86400000) + onejan.getDay()) / 7);
}
getDaysNumber(year, month) {
const dates = [];
const daysInMonth = new Date(year, month, 0).getDate();
for (let i = 1; i <= daysInMonth; i++) {
let parts = new Date(year + "-" + month + "-" + i);
dates.push(this.convertToDesiredDate(parts));
}
return dates;
}
convertToDesiredDate(str) {
let date = new Date(str),
month = ("0" + (date.getMonth() + 1)).slice(-2),
day = ("0" + date.getDate()).slice(-2);
return [date.getFullYear(), month, day].join("-");
}其中daysNumber包含从01-31 (5月)开始的月日。
它会增长取决于月份。
我不得不将它们作为数组填充，以确定每周有多少次出现在像我的输出这样的日期。
Stack Overflow用户
发布于 2020-05-02 16:55:24
你的问题有点乱，但我会尽力的。我使用了您的getWeekNumber实现，提供了自己的日期，并编写了一个简单的reduce。如果某一周没有条目，我们将其加为1，否则就会增加，仅此而已。了解更多关于Array.prototype.reduce 这里的信息。
const dates = [
new Date('2000-01-01'),
new Date('2000-01-25'),
new Date('2000-02-01'),
new Date('2000-02-02'),
new Date('2000-02-03'),
];
const getWeekNumber = now => {
let onejan = new Date(now.getFullYear(), 0, 1);
return Math.ceil((((now - onejan) / 86400000) + onejan.getDay()) / 7);
}
const result = dates.reduce((countPerWeek, date) => {
const weekNumber = getWeekNumber(date);
if (!countPerWeek[weekNumber]) {
countPerWeek[weekNumber] = 1;
} else {
countPerWeek[weekNumber]++;
}
return countPerWeek;
}, {});
console.log(result);
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/61562844
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