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javascript - 在 Javascript 中以星期一开始和星期日结束获取一周的开始和结束

转载 作者:行者123 更新时间:2023-12-03 20:56:38 25 4
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    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,如果我们添加第一个加一,它将以星期一为开始,但问题是可以说(06/29/2014,星期日)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“第一个 + 1”,它将返回 06/30/2014 作为开始日期和 07/06/2014 作为结束日期。有什么帮助吗?谢谢。

回答:
    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);
}

最佳答案

您可以通过移动 getDay() 的结果,然后对结果取模来首先将其设置为星期一。

var first = curr.getDate() - ((curr.getDay() + 6) % 7); 

关于javascript - 在 Javascript 中以星期一开始和星期日结束获取一周的开始和结束,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/24480062/

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