【发布时间】:2022-03-10 23:59:36
【问题描述】:
function getStartAndEndOfWeek(date) {
var curr = date ? new Date(date) : new Date();
var first = curr.getDate() - curr.getDay();
var firstday = new Date(curr.setDate(first));
var lastday = new Date(curr.setDate(firstday.getDate() + 6));
return [firstday, lastday];
}
我无法将一周的开始时间设置为星期一。上面的代码将第一天作为星期日。此外,如果我们完全添加第一个加一个,它将以星期一作为开始,但问题是让我们说 (06/29/2014, sunday) 是输入,它应该返回 (06/23/2014 作为开始和 06 /29/2014)作为结束。我们怎样才能做到这一点?如果我添加“first + 1”,它将返回 06/30/2014 作为开始日期,并将 07/06/2014 作为结束日期。有什么帮助吗?谢谢。
答案:
function getStartAndEndOfWeek(date) {
//Calculating the starting point
var curr = date ? new Date(date) : new Date();
var first = curr.getDate() - dayOfWeek(curr);
var firstday, lastday;
if (first < 1) {
//Get prev month and year
var k = new Date(curr.valueOf());
k.setDate(1);
k.setMonth(k.getMonth() - 1);
var prevMonthDays = new Date(k.getFullYear(), (k.getMonth() + 1), 0).getDate();
first = prevMonthDays - (dayOfWeek(curr) - curr.getDate());
firstday = new Date(k.setDate(first));
lastday = new Date(k.setDate(first + 6));
} else {
// First day is the day of the month - the day of the week
firstday = new Date(curr.setDate(first));
lastday = new Date(curr.setDate(first + 6));
}
return [firstday, lastday];
}
function dayOfWeek(date, firstDay) {
var daysOfWeek = {
sunday: 0,
monday: 1,
tuesday: 2,
wednesday: 3,
thursday: 4,
friday: 5,
saturday: 6,
};
firstDay = firstDay || "monday";
var day = date.getDay() - daysOfWeek[firstDay];
return (day < 0 ? day + 7 : day);
}
【问题讨论】:
标签: javascript date