@z-yue/calendar/build/es/index.js

根据当前阳(公)历日期获取阴(农)历日期，节日

const lunarMonth = ['', '正月', '二月', '三月', '四月', '五月', '六月', '七月', '八月', '九月', '十月', '冬月', '腊月'];
const lunarDate = ['', '初一', '初二', '初三', '初四', '初五', '初六', '初七', '初八', '初九', '初十', '十一', '十二', '十三', '十四', '十五', '十六', '十七', '十八', '十九', '二十', '廿一', '廿二', '廿三', '廿四', '廿五', '廿六', '廿七', '廿八', '廿九', '三十'];

class Lunar {
  constructor(date = new Date()) {
    this.LOCALES = 'ja-JP-u-ca-chinese';

    this.match = (month, date) => this.month === month && this.date === date;

    this.isNewYear = () => this.match(1, 1) || this.match(1, 2) || this.match(1, 3) || this.match(1, 4) || this.match(1, 5) || this.match(1, 6) || this.match(1, 7);

    this.isLantern = () => this.match(1, 15);

    this.isDoubleSeventh = () => this.match(7, 7);

    this.isMidAutumn = () => this.match(8, 15);

    this.isDoubleNinth = () => this.match(9, 9);

    this.now = date.toLocaleString(this.LOCALES);
    this.publicDate = date;
  }

  get year() {
    return this.now.slice(0, this.now.search(/\d+月/));
  }

  get month() {
    return parseInt(this.now.slice(this.now.search(/\d+月/), this.now.search(/月/)));
  }

  get date() {
    return parseInt(this.now.slice(this.now.search(/\d+日/), this.now.search(/日/)));
  }

  get lunarMonth() {
    return lunarMonth[this.month] || '';
  }

  get lunarDate() {
    return lunarDate[this.date] || '';
  }

  get isBigMonth() {
    const diff = 30 - this.date;
    const publicDate = new Date(this.publicDate);
    publicDate.setDate(publicDate.getDate() + diff);
    const newDate = publicDate.toLocaleString('ja-JP-u-ca-chinese');
    const newMonth = parseInt(newDate.slice(newDate.search(/\d+月/), newDate.search(/月/)));
    return newMonth === this.month;
  }

  get isSmallMonth() {
    return !this.isBigMonth;
  }

  get full() {
    return `${this.year}${this.lunarMonth}${this.lunarDate}`;
  }

  get festival() {
    if (this.isNewYear()) return '新年';
    if (this.isLantern()) return '元宵节';
    if (this.isDoubleSeventh()) return '七夕节';
    if (this.isMidAutumn()) return '中秋节';
    if (this.isDoubleNinth()) return '重阳节';
    return '';
  }

}

class Calendar {
  constructor(date = new Date()) {
    this.match = (month, date) => this.month === month && this.date === date;

    this.isTombSweeping = () => this.match(4, 4);

    this.isValentineDay = () => this.match(2, 14);

    this.isAprilFoolDay = () => this.match(4, 1);

    this.isChristmas = () => this.match(12, 25);

    this.isHalloween = () => this.match(10, 31);

    this.isNewYear = () => this.match(1, 1);

    this.now = date;
    this.lunar = new Lunar(date);
  }

  get year() {
    return this.now.getFullYear();
  }

  get month() {
    return this.now.getMonth() + 1;
  }

  get date() {
    return this.now.getDate();
  }

  get day() {
    return this.now.getDay();
  }

  get festival() {
    if (this.isTombSweeping()) return '清明节';
    if (this.isValentineDay()) return '情人节';
    if (this.isAprilFoolDay()) return '愚人节';
    if (this.isChristmas()) return '圣诞节';
    if (this.isHalloween()) return '万圣节';
    if (this.isNewYear()) return '元旦节';
    return '';
  }

  get fullFestival() {
    return [this.festival, this.lunar.festival].filter(f => f !== '').join(' ');
  }

}

export default Calendar;