本文实例讲述了JS实现获取当前所在周的周六、周日。分享给大家供大家参考，具体如下：
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;
}
PS：这里再为大家推荐几款时间及日期相关工具供大家参考使用：
在线日期/天数计算器：
http://tools.softyun.net/jisuanqi/date_jisuanqi
在线日期计算器/相差天数计算器：
http://tools.softyun.net/jisuanqi/datecalc
在线日期天数差计算器：
http://tools.softyun.net/jisuanqi/onlinedatejsq
Unix时间戳(timestamp)转换工具：
http://tools.softyun.net/code/unixtime
希望本文所述对大家JavaScript程序设计有所帮助。
