js获取本周，本月，本年

    // 计算当周
    function getDates() {
      var data = new Date();
      var timesStamp = data.getTime();
      console.log(timesStamp)
      var currenDay = data.getDay();
      var dates = [];

      for (var i = 0; i < 7; i++) {
        dates.push(
          new Date(
            timesStamp + 24 * 60 * 60 * 1000 * (i - ((currenDay + 6) % 7)))
            .toLocaleDateString()
        );
      }

      return dates
    };

    //计算当月
    function ThisMonth() {
      var date = new Date();
      var year = date.getFullYear();
      var month = date.getMonth();

      var min = new Date(year, month, 1);
      var max = new Date(year, month + 1, 0);


      return [formatDateTime(min, 'YYYYMMDD'), formatDateTime(max, 'YYYYMMDD')]

    };

    // 获取本年
    function ThisYear() {
      var firstDay = new Date();
      firstDay.setDate(1);
      firstDay.setMonth(0);
      var lastDay = new Date();
      lastDay.setFullYear(lastDay.getFullYear() + 1);
      lastDay.setDate(0);
      lastDay.setMonth(-1);

      firstDay = formatDateTime(firstDay, 'YYYYMMDD');
      lastDay = formatDateTime(lastDay, 'YYYYMMDD');

      return [firstDay, lastDay];
    };


    //日期格式化
    function formatDateTime(time, format, YMSign = '-', HSSign = ':') {
      let formatDate = '';
      function add0(num) {
        return num >= 10 ? num : '0' + num;
      }
      let date = new Date(time);
      let year = date.getFullYear();
      let mounth = add0(date.getMonth() + 1);
      let day = add0(date.getDate());
      let hours = add0(date.getHours());
      let minutes = add0(date.getMinutes());
      let seconds = add0(date.getSeconds());
      switch (format) {
        case 'YYYY':
          formatDate = `${year}`;
          break;
        case 'YYYY-MM':
          formatDate = `${year}${YMSign}${mounth}`;
          break;
        case 'YYYYMM':
          formatDate = `${year}${mounth}`;
          break;
        case 'YYYY-MM-DD':
          formatDate = `${year}${YMSign}${mounth}${YMSign}${day}`;
          break;
        case 'YYYYMMDD':
          formatDate = `${year}${mounth}${day}`;
          break;
        case 'YYYY-MM-DD HH:MM:SS':
          formatDate = `${year}${YMSign}${mounth}${YMSign}${day} ${hours}${HSSign}${minutes}${HSSign}${seconds}`;
          break;
        default:
          formatDate = `${year}${YMSign}${mounth}${YMSign}${day}T${hours}${HSSign}${minutes}${HSSign}${seconds}`;
      }
      return formatDate;
    }