# 日期格式化

Date.prototype.format = function (format) {
  var $1, o = {
    "M+": this.getMonth() + 1,      // 月份，从0开始算
    "d+": this.getDate(),           // 日期
    "h+": this.getHours(),          // 小时
    "m+": this.getMinutes(),        // 分钟
    "s+": this.getSeconds(),        // 秒钟
                                    // 季度 quarter
    "q+": Math.floor((this.getMonth() + 3) / 3),
    "S": this.getMilliseconds() // 千秒
  };
  var key, value;

  if (/(y+)/.test(format)) {
    $1 = RegExp.$1,
      format = format.replace($1, String(this.getFullYear()).substr(4 - $1));
  }

  for (key in o) { // 如果没有指定该参数，则子字符串将延续到 stringvar 的最后。
    if (new RegExp("(" + key + ")").test(format)) {
      $1 = RegExp.$1,
        value = String(o[key]),
        value = $1.length == 1 ? value : ("00" + value).substr(value.length),
        format = format.replace($1, value);
    }
  }
  return format;
};

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";
let weekString="日一二三四五六";
let sx="鼠牛虎兔龙蛇马羊猴鸡狗猪";
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;


function GetBit(m,n){
  return (m>>n)&1;
}

//农历转换
function e2c(){
  TheDate= (arguments.length!=3) ? new Date() : new Date(arguments[0],arguments[1],arguments[2]);
  var total,m,n,k;
  var isEnd=false;
  var tmp=TheDate.getYear();
  if(tmp<1900){
    tmp+=1900;
  }
  total=(tmp-1921)*365+Math.floor((tmp-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--;
    }
  }
}

function GetcDateString(){
  var tmp="";
  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;
}

function GetLunarDay(solarYear,solarMonth,solarDay){
  if(solarYear<1921 || solarYear>2020){
    return "";
  }else{
    solarMonth = (parseInt(solarMonth)>0) ? (solarMonth-1) : 11;
    e2c(solarYear,solarMonth,solarDay);
    return GetcDateString();
  }
}

/*获取当前农历*/
function show_lunar_calendar(){
  let D=new Date();
  let yy=D.getFullYear();
  let mm=D.getMonth()+1;
  let dd=D.getDate();
  let ww=D.getDay();
  let ss=parseInt(D.getTime() / 1000);
  if (yy<100) yy="19"+yy;
  return GetLunarDay(yy,mm,dd);
}
/*调用农历函数*/
//let lunarHtml ="农历"+ show_lunar_calendar();

export default {
  getLunarDay(yy,mm,dd){
    return '农历' + GetLunarDay(yy,mm,dd);
  }
}