JS实现获取当前所在周的周六、周日示例分析

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：

在线日期计算器/相差天数计算器：

在线日期天数差计算器：

Unix时间戳(timestamp)转换工具：

更多关于JavaScript相关内容感兴趣的读者可查看本站专题：《JavaScript时间与日期操作技巧总结》、《JavaScript查找算法技巧总结》、《JavaScript错误与调试技巧总结》、《JavaScript数据结构与算法技巧总结》、《JavaScript遍历算法与技巧总结》及《JavaScript数学运算用法总结》