js获取指定日期的一周事件、一周开始和结束的日期

我们将这些函数挂载到Date身上

//周开始日期（周一为每周开始，周日为每周结束）
Date.prototype.beginOfWeek = function () {
  let subDay = 0;
  let weekDay = this.getDay();
  if (weekDay == 0) {
    //周天
    subDay = 6;
  } else {
    subDay = weekDay - 1;
  }
  let beginDateTime = this.getTime() - (86400000 * subDay);
  let data = new Date(beginDateTime).getDate()
  let month = new Date(beginDateTime).getMonth() + 1
  let year = new Date(beginDateTime).getFullYear()
  return year + '-' + (month < 10 ? '0' + month : month) + '-' + (data < 10 ? '0' + data : data);
}
//周结束日期（周一为每周开始，周日为每周结束）
Date.prototype.endOfWeek = function () {
  let weekDay = this.getDay();
  if (weekDay == 0) {
    //周天
    let data = this.getDate()
    let month = this.getMonth() + 1
    let year = this.getFullYear()
    return year + '-' + (month < 10 ? '0' + month : month) + '-' + (data < 10 ? '0' + data : data);
  } else {
    let addDay = 7 - weekDay;
    let endDateTime = this.getTime() + (86400000 * addDay);
    let data = new Date(endDateTime).getDate()
    let month = new Date(endDateTime).getMonth() + 1
    let year = new Date(endDateTime).getFullYear()
    return year + '-' + (month < 10 ? '0' + month : month) + '-' + (data < 10 ? '0' + data : data);
  }
}
// 指定日期的一周的所有日期的数组
Date.prototype.getWeekTime = function () {
  // var new_Date = new Date(2021,11,10) //获取指定日期当周的一周日期
  var new_Date = this//获取本周一周日期
  var timesStamp = new_Date.getTime();
  var currenDay = new_Date.getDay();
  var dates = [];
  for (var i = 0; i < 7; i++) {
    var das = new Date(timesStamp + 24 * 60 * 60 * 1000 * (i - (currenDay + 6) % 7)).toLocaleDateString();
    das.replace(/[年月]/g, '.').replace(/[日上下午]/g, '');
    dates.push(das);
  }
  return dates
}

使用：

new Date().getWeekTime()
new Date(2023,2,15).getWeekTime()
new Date(2023,2,15).beginOfWeek()
new Date(2023,2,15).endOfWeek()

结果：