本文實例講述了JS實現獲取當前所在周的周六、周日。分享給大家供大家參考，具體如下：

需求：無論當前是哪一天，獲取當天所在周的周末 是哪一天

實現步驟：

比如，今天周一，則周日距離今天還有(7-1)=6天，那么將今天的時間(毫秒數)，加上六天后的時間(6*_dayLongTime 毫秒數)，然后根據date函數，轉換為幾月幾日。

1、獲取當天的時間

let _nowTime=new Date().getTime();

2、獲取當天是星期幾

let _week=_date.getDay();

3、設置一天的時長

let _dayLongTime=24*60*60*1000;

4、獲取周六周日距離現在還有多少毫秒

let _furtureSundayTimes = _nowTime + (7 - _week) * _dayLongTime;

let _furtureSaturdayTimes = _nowTime + (6 - _week) * _dayLongTime;

5、將毫秒數轉為date對象

_furtureSundayTimes = new Date(_furtureSundayTimes);

_furtureSaturdayTimes = new Date(_furtureSaturdayTimes);

6、根據日期獲取幾月幾日

// staurday

let _satYear = _furtureSaturdayTimes.getFullYear();

let _satMonth = _furtureSaturdayTimes.getMonth() + 1;

let _satDay = _furtureSaturdayTimes.getDate();

//sunday

let _sunYear = _furtureSundayTimes.getFullYear();

let _sunMonth = _furtureSundayTimes.getMonth() + 1;

let _sunDay = _furtureSundayTimes.getDate();

7、格式化

_satMonth = _satMonth >= 10 ? _satMonth : '0' + _satMonth;

_satDay = _satDay >= 10 ? _satDay : '0' + _satDay;

_sunMonth = _sunMonth >= 10 ? _sunMonth : '0' + _sunMonth;

_sunDay = _sunDay >= 10 ? _sunDay : '0' + _sunDay;

_mealSunDay = _satYear+'-'+_satMonth+'-'+_satDay;

_mealSaturDay = _sunYear+ '-'+_sunMonth+'-'+_sunDay;

8、注：之所以不僅獲取周六，然后周日則用周六加1，就行，因為很有可能改周末不在同一個月份，比如3.31周六，4.01周日，月份不相同

9、方法體

function getWeekDay() {

let _date = new Date();

let _nowTime = _date.getTime();

let _week = _date.getDay();

let _dayLongTime = 24 * 60 * 60 * 1000;

let _furtureSundayTimes = _nowTime + (7 - _week) * _dayLongTime;

let _furtureSaturdayTimes = _nowTime + (6 - _week) * _dayLongTime;

_furtureSundayTimes = new Date(_furtureSundayTimes);

_furtureSaturdayTimes = new Date(_furtureSaturdayTimes);

// staurday

let _satYear = _furtureSaturdayTimes.getFullYear();

let _satMonth = _furtureSaturdayTimes.getMonth() + 1;

let _satDay = _furtureSaturdayTimes.getDate();

//sunday

let _sunYear = _furtureSundayTimes.getFullYear();

let _sunMonth = _furtureSundayTimes.getMonth() + 1;

let _sunDay = _furtureSundayTimes.getDate();

_satMonth = _satMonth >= 10 ? _satMonth : '0' + _satMonth;

_satDay = _satDay >= 10 ? _satDay : '0' + _satDay;

_sunMonth = _sunMonth >= 10 ? _sunMonth : '0' + _sunMonth;

_sunDay = _sunDay >= 10 ? _sunDay : '0' + _sunDay;

_mealSunDay = _satYear+'-'+_satMonth+'-'+_satDay;

_mealSaturDay = _sunYear+ '-'+_sunMonth+'-'+_sunDay;

let _weekendDay = [{

saturDay: _mealSunDay

}, {

sunDay: _mealSaturDay

}]

return _weekendDay;

}

PS：這里再為大家推薦幾款時間及日期相關工具供大家參考使用：

希望本文所述對大家JavaScript程序設計有所幫助。

總結

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