Question

我正在使用一个返回当前一周的函数，如43,45等。

我想要的是将其作为本周的第1周第2周。

P.S我今年只有当前一周，没有约会

Answer 1

var getWeekOfMonth = function(date) {
    var month = date.getMonth(),
        year = date.getFullYear(),
        firstWeekday = new Date(year, month, 1).getDay(),
        lastDateOfMonth = new Date(year, month + 1, 0).getDate(),
        offsetDate = 7 - firstWeekday,
        daysAfterFirstWeek = lastDateOfMonth - offsetDate,
        weeksInMonth = Math.ceil(daysAfterFirstWeek / 7) + 1;

    var noOfDaysAfterRemovingFirstWeek = date.getDate() - offsetDate;
    if (noOfDaysAfterRemovingFirstWeek <= 0) {
        week = 1;
    } else if (noOfDaysAfterRemovingFirstWeek <= 7) {
        week = 2;
    } else if (noOfDaysAfterRemovingFirstWeek <= 14) {
        week = 3;
    } else if (noOfDaysAfterRemovingFirstWeek <= 21) {
        week = 4;
    } else if (weeksInMonth >= 5 && noOfDaysAfterRemovingFirstWeek <= 28) {
        week = 5;
    } else if (weeksInMonth === 6) {
        week = 6;
    }
    return week;
};

Answer 2

Using 'moment' module:

var moment = require('moment');

function foo(weekOfYear) {
    var dayOfMonth = moment().week(weekOfYear).date();
    var weekOfMonth = Math.ceil(dayOfMonth / 7);
    return weekOfMonth;
}

console.log(foo(1)) //1
console.log(foo(11)) //2
console.log(foo(12)) //3
console.log(foo(13)) //4
console.log(foo(14)) //1

从一年中的周数获取月份的周数

2 个答案: