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
// staurdaylet _satYear = _furtureSaturdayTimes.getFullYear();let _satMonth = _furtureSaturdayTimes.getMonth() + 1;let _satDay = _furtureSaturdayTimes.getDate();//sundaylet _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;}
希望本文所述对大家JavaScript程序设计有所帮助。
注：相关教程知识阅读请移步到JavaScript/Ajax教程频道。
