需求:无论当前是哪一天,获取当天所在周的周末 是哪一天
实现步骤:
比如,今天周一,则周日距离今天还有(7-1)=6天,那么将今天的时间(毫秒数),加上六天后的时间(6*_dayLongTime 毫秒数),然后根据date函数,转换为几月几日。
1、获取当天的时间
let _nowTime=new Date().getTime();
2、获取当天是星期几
let _week=_date.getDay();
3、设置一天的时长
let _dayLongTime=24*60*60*1000;
4、获取周六周日距离现在还有多少毫秒
let _furtureSundayTimes = _nowTime + (7 - _week) * _dayLongTime;
let _furtureSaturdayTimes = _nowTime + (6 - _week) * _dayLongTime;
5、将毫秒数转为date对象
_furtureSundayTimes = new Date(_furtureSundayTimes);
_furtureSaturdayTimes = new Date(_furtureSaturdayTimes);
6、根据日期获取几月几日
// 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:之所以不仅获取周六,然后周日则用周六加1,就行,因为很有可能改周末不在同一个月份,比如3.31周六,4.01周日,月份不相同
9、方法体
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;
}