JavaScript获取某一天所在的星期

function getWeekStartAndEnd() {
  const oneDayTime = 1000 * 60 * 60 * 24; // 一天里一共的毫秒数
  const today = new Date();
  const todayDay = today.getDay(); // 获取今天是星期几，假设是周3
  const startDate = new Date(
    today.getTime() - oneDayTime * (todayDay - 1)
  );
  const endDate = new Date(today.getTime() + oneDayTime * (7 - todayDay));

  return { startDate, endDate };
}
const week = getWeekStartAndEnd();
console.log(week.startDate, week.endDate);

function getWeekStartAndEnd(timestamp) {
  const oneDayTime = 1000 * 60 * 60 * 24; // 一天里一共的毫秒数
  const today = timestamp ? new Date(timestamp) : new Date();
  const todayDay = today.getDay() || 7; // 若那一天是周末时，则强制赋值为7
  const startDate = new Date(
    today.getTime() - oneDayTime * (todayDay - 1)
  );
  const endDate = new Date(today.getTime() + oneDayTime * (7 - todayDay));

  return { startDate, endDate };
}

function getAllWeekToday() {
  const oneDayTime = 1000 * 60 * 60 * 24;
  const today = new Date();
  const todayDay = today.getDay() || 7; // 若那一天是周末时，则强制赋值为7
  const startDate = new Date(
    today.getTime() - oneDayTime * (todayDay - 1)
  );
  let dateList = [startDate];

  for (let i = 1; i < 7; i++) {
    dateList.push(new Date(startDate.getTime() + oneDayTime * i));
  }
  return dateList;
}