获取万年历的方法```js function GetBit(m, n) { return (m >> n) & 1; }

function GetBit(m, n) { return (m >> n) & 1; }
function GetcDateString() {
  let CalendarData = new Array(100);
  let madd = new Array(12);
  let tgString = "甲乙丙丁戊己庚辛壬癸";
  let dzString = "子丑寅卯辰巳午未申酉戌亥";
  let numString = "一二三四五六七八九十";
  let monString = "正二三四五六七八九十冬腊";
  var sx =  ["猴","鸡","狗","猪","鼠","牛","虎","兔","龙","蛇","马","羊"];
  let cYear, cMonth, cDay, TheDate;
  CalendarData = new Array(0xA4B, 0x5164B, 0x6A5, 0x6D4, 0x415B5, 0x2B6, 0x957, 0x2092F, 0x497, 0x60C96, 0xD4A, 0xEA5, 0x50DA9, 0x5AD, 0x2B6, 0x3126E, 0x92E, 0x7192D, 0xC95, 0xD4A, 0x61B4A, 0xB55, 0x56A, 0x4155B, 0x25D, 0x92D, 0x2192B, 0xA95, 0x71695, 0x6CA, 0xB55, 0x50AB5, 0x4DA, 0xA5B, 0x30A57, 0x52B, 0x8152A, 0xE95, 0x6AA, 0x615AA, 0xAB5, 0x4B6, 0x414AE, 0xA57, 0x526, 0x31D26, 0xD95, 0x70B55, 0x56A, 0x96D, 0x5095D, 0x4AD, 0xA4D, 0x41A4D, 0xD25, 0x81AA5, 0xB54, 0xB6A, 0x612DA, 0x95B,
    0x49B, 0x41497, 0xA4B, 0xA164B, 0x6A5, 0x6D4, 0x615B4, 0xAB6, 0x957, 0x5092F,
    0x497, 0x64B, 0x30D4A, 0xEA5, 0x80D65, 0x5AC, 0xAB6, 0x5126D, 0x92E, 0xC96, 0x41A95, 0xD4A, 0xDA5, 0x20B55, 0x56A, 0x7155B, 0x25D, 0x92D, 0x5192B, 0xA95, 0xB4A, 0x416AA, 0xAD5, 0x90AB5, 0x4BA, 0xA5B, 0x60A57, 0x52B, 0xA93, 0x40E95);
  madd[0] = 0; madd[1] = 31; madd[2] = 59; madd[3] = 90;
  madd[4] = 120; madd[5] = 151; madd[6] = 181; madd[7] = 212;
  madd[8] = 243; madd[9] = 273; madd[10] = 304; madd[11] = 334;

  TheDate = (arguments.length != 3) ? new Date() : new Date(arguments[0], arguments[1], arguments[2]);
  let total, m, n, k;
  let isEnd = false;
  let tmps = TheDate.getFullYear();
  total = (tmps - 1921) * 365 + Math.floor((tmps - 1921) / 4) + madd[TheDate.getMonth()] + TheDate.getDate() - 38; if (TheDate.getYear() % 4 == 0 && TheDate.getMonth() > 1) { total++; } for (m = 0; ; m++) { k = (CalendarData[m] < 0xfff) ? 11 : 12; for (n = k; n >= 0; n--) { if (total <= 29 + GetBit(CalendarData[m], n)) { isEnd = true; break; } total = total - 29 - GetBit(CalendarData[m], n); } if (isEnd) break; } cYear = 1921 + m; cMonth = k - n + 1; cDay = total; if (k == 12) { if (cMonth == Math.floor(CalendarData[m] / 0x10000) + 1) { cMonth = 1 - cMonth; } if (cMonth > Math.floor(CalendarData[m] / 0x10000) + 1) { cMonth--; } }
  let tmp = ""; tmp += tgString.charAt((cYear - 4) % 10);
  tmp += dzString.charAt((cYear - 4) % 12);
  let year = moment().format('YYYY')
  let y = Number(year) % 12;
  tem += `(${sx[y]})`
  tmp += "年 ";
  if (cMonth < 1) { tmp += "(闰)"; tmp += monString.charAt(-cMonth - 1); } else { tmp += monString.charAt(cMonth - 1); } tmp += "月"; tmp += (cDay < 11) ? "初" : ((cDay < 20) ? "十" : ((cDay < 30) ? "廿" : "三十"));
  if (cDay % 10 != 0 || cDay == 10) { tmp += numString.charAt((cDay - 1) % 10); }
  return tmp;
}