JS获取当月每天的日期，JS获取本周每天的日期

获取当前月每天的日期，获取当前周每天的日期实现代码：

调用代码：

console.log('-----------------', getNowM(), getWeekDay())

结果：我今天是2020-2-28日

封装方法：

function getDay(num, str) {
  var today = new Date();
  var nowTime = today.getTime();
  var ms = 24 * 3600 * 1000 * num;
  today.setTime(parseInt(nowTime + ms));
  var oYear = today.getFullYear();
  var oMoth = (today.getMonth() + 1).toString();
  if (oMoth.length <= 1) oMoth = '0' + oMoth;
  var oDay = today.getDate().toString();
  if (oDay.length <= 1) oDay = '0' + oDay;
  return oYear + str + oMoth + str + oDay;
}
// 格式化日期
function formatDate(date) {
  date = new Date(date);
  let myyear = date.getFullYear();
  let mymonth = date.getMonth() + 1;
  let myweekday = date.getDate();
  mymonth < 10 ? mymonth = "0" + mymonth : mymonth;
  myweekday < 10 ? myweekday = "0" + myweekday : myweekday;
  return `${myyear}-${mymonth}-${myweekday}`;
}
// 获取当前月的天数
function mGetDate() {
  var date = new Date();
  var year = date.getFullYear();
  var month = date.getMonth() + 1;
  var d = new Date(year, month, 0);
  return d.getDate();
}
// 获取本周的日期
function getWeekDay() {
  let dateString = formatDate(new Date());//当天的日期，例如2020-2-28
  let presentDate = new Date(dateString);
  let today = presentDate.getDay() !== 0 ? presentDate.getDay() : 7;

  return Array.from(new Array(7), function (val, index) {
    return formatDate(new Date(presentDate.getTime() - (today - index - 1) * 24 * 60 * 60 * 1000));
  });
}
// 获取当前月的所有日期
function getNowM(e) {
  let now = new Date();
  let current_month_num = mGetDate();
  let current_month = [];
  for (let i = 1; i <= current_month_num; i++) {
    let day = now.setDate(i);
    let everyDay = formatDate(day);
    current_month.push(everyDay);
  }
  return current_month;
}