JS Date操作

JS Date操作

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const weekDay = new Date(date.setDate(1)).getDay() // 这个月的第一天是星期几const monthLen = new Date(date.getFullYear(), date.getMonth() + 1, 0).getDate() // 本月一共多少天

获取一周的日期

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getDate(offset: number) {
  const current = new Date();  const weekDay = current.getDay();  const dayMilliseconds = 24 * 60 * 60 * 1000; // 一天多少毫秒  const flagTimestamp = current.setHours(0, 0, 0, 0) + offset * 7 * dayMilliseconds;  const dateAry = [...new Array(7).keys()]
  .map((i: number) => new Date(flagTimestamp + (i + 1 - weekDay) * dayMilliseconds));  console.log(dateAry);}