如何在JavaScript中获得一周中的第一天和最后一天

function getWeekStartAndEnd() {
  const now = new Date();
  const day = now.getDay();
  const weekStart = new Date(now.valueOf() - (day - 1) * 24 * 60 * 60 * 1000);
  const weekEnd = new Date(weekStart.valueOf() + 6 * 24 * 60 * 60 * 1000);

  return {
    weekStart: weekStart.toISOString(),
    weekEnd: weekEnd.toISOString()
  };
}

const { weekStart, weekEnd } = getWeekStartAndEnd();
console.log("一周的第一天是：", weekStart);
console.log("一周的最后一天是：", weekEnd);