JavaScript查询"今天是农历几号"的代码

下面这个JS类使用了面向对象的思想重新设计,使查询今天是农历几月几日星期几更快速.

function ChineseCalendar(dateObj){
    this.dateObj = (dateObj != undefined) ? dateObj : new Date();
    this.SY = this.dateObj.getFullYear();
    this.SM = this.dateObj.getMonth();
    this.SD = this.dateObj.getDate();
        this.lunarInfo = [0x04bd8,0x04ae0,0x0a570,0x054d5,0x0d260,0x0d950,0x16554,0x056a0,0x09ad0,0x055d2,
            0x04ae0,0x0a5b6,0x0a4d0,0x0d250,0x1d255,0x0b540,0x0d6a0,0x0ada2,0x095b0,0x14977,
            0x04970,0x0a4b0,0x0b4b5,0x06a50,0x06d40,0x1ab54,0x02b60,0x09570,0x052f2,0x04970,
            0x06566,0x0d4a0,0x0ea50,0x06e95,0x05ad0,0x02b60,0x186e3,0x092e0,0x1c8d7,0x0c950,
            0x0d4a0,0x1d8a6,0x0b550,0x056a0,0x1a5b4,0x025d0,0x092d0,0x0d2b2,0x0a950,0x0b557,
            0x06ca0,0x0b550,0x15355,0x04da0,0x0a5b0,0x14573,0x052b0,0x0a9a8,0x0e950,0x06aa0,
            0x0aea6,0x0ab50,0x04b60,0x0aae4,0x0a570,0x05260,0x0f263,0x0d950,0x05b57,0x056a0,
            0x096d0,0x04dd5,0x04ad0,0x0a4d0,0x0d4d4,0x0d250,0x0d558,0x0b540,0x0b6a0,0x195a6,
            0x095b0,0x049b0,0x0a974,0x0a4b0,0x0b27a,0x06a50,0x06d40,0x0af46,0x0ab60,0x09570,
            0x04af5,0x04970,0x064b0,0x074a3,0x0ea50,0x06b58,0x055c0,0x0ab60,0x096d5,0x092e0,
            0x0c960,0x0d954,0x0d4a0,0x0da50,0x07552,0x056a0,0x0abb7,0x025d0,0x092d0,0x0cab5,
            0x0a950,0x0b4a0,0x0baa4,0x0ad50,0x055d9,0x04ba0,0x0a5b0,0x15176,0x052b0,0x0a930,
            0x07954,0x06aa0,0x0ad50,0x05b52,0x04b60,0x0a6e6,0x0a4e0,0x0d260,0x0ea65,0x0d530,
            0x05aa0,0x076a3,0x096d0,0x04bd7,0x04ad0,0x0a4d0,0x1d0b6,0x0d250,0x0d520,0x0dd45,
            0x0b5a0,0x056d0,0x055b2,0x049b0,0x0a577,0x0a4b0,0x0aa50,0x1b255,0x06d20,0x0ada0,
            0x14b63];

    //传回农历 y年闰哪个月 1-12 , 没闰传回 0
    this.leapMonth = function(y){
        return this.lunarInfo[y - 1900] & 0xf;
    };
    //传回农历 y年m月的总天数
    this.monthDays = function(y, m){
        return (this.lunarInfo[y - 1900] & (0x10000 >> m)) ? 30 : 29;
    };
    //传回农历 y年闰月的天数
    this.leapDays = function(y){
        if (this.leapMonth(y)) {
            return (this.lunarInfo[y - 1900] & 0x10000) ? 30 : 29;
        }
        else {
            return 0;
        }
    };
    //传回农历 y年的总天数
    this.lYearDays = function(y){
        var i, sum = 348;
        for (i = 0x8000; i > 0x8; i >>= 1) {
            sum += (this.lunarInfo[y - 1900] & i) ? 1 : 0;
        }
        return sum + this.leapDays(y);
    };
    //算出农历, 传入日期对象, 传回农历日期对象
    //该对象属性有 .year .month .day .isLeap .yearCyl .dayCyl .monCyl
    this.Lunar = function(dateObj){
        var i, leap = 0, temp = 0, lunarObj = {};
        var baseDate = new Date(1900, 0, 31);
        var offset = (dateObj - baseDate) / 86400000;
        lunarObj.dayCyl = offset + 40;
        lunarObj.monCyl = 14;
        for (i = 1900; i < 2050 && offset > 0; i++) {
            temp = this.lYearDays(i);
            offset -= temp;
            lunarObj.monCyl += 12;
        }
        if (offset < 0) {
            offset += temp;
            i--;
            lunarObj.monCyl -= 12;
        }
       
        lunarObj.year = i;
        lunarObj.yearCyl = i - 1864;
        leap = this.leapMonth(i);
        lunarObj.isLeap = false;
        for (i = 1; i < 13 && offset > 0; i++) {
            if (leap > 0 && i == (leap + 1) && lunarObj.isLeap == false) {
                --i;
                lunarObj.isLeap = true;
                temp = this.leapDays(lunarObj.year);
            }
            else {
                temp = this.monthDays(lunarObj.year, i)
            }
            if (lunarObj.isLeap == true && i == (leap + 1)) {
                lunarObj.isLeap = false;
            }
            offset -= temp;
            if (lunarObj.isLeap == false) {
                lunarObj.monCyl++;
            }
        }
       
        if (offset == 0 && leap > 0 && i == leap + 1) {
            if (lunarObj.isLeap) {
                lunarObj.isLeap = false;
            }
            else {
                lunarObj.isLeap = true;
                --i;
                --lunarObj.monCyl;
            }
        }
       
        if (offset < 0) {
            offset += temp;
            --i;
            --lunarObj.monCyl
        }
        lunarObj.month = i;
        lunarObj.day = offset + 1;
        return lunarObj;
    };
    //中文日期
    this.cDay = function(m, d){
        var nStr1 = ['日', '一', '二', '三', '四', '五', '六', '七', '八', '九', '十'];
        var nStr2 = ['初', '十', '廿', '卅', '　'];
        var s;
        if (m > 10) {
            s = '十' + nStr1[m - 10];
        }
        else {
            s = nStr1[m];
        }
        s += '月';
        switch (d) {
            case 10:
                s += '初十';
                break;
            case 20:
                s += '二十';
                break;
            case 30:
                s += '三十';
                break;
            default:
                s += nStr2[Math.floor(d / 10)];
                s += nStr1[d % 10];
        }
        return s;
    };
    this.solarDay2 = function(){
        var sDObj = new Date(this.SY, this.SM, this.SD);
        var lDObj = this.Lunar(sDObj);
        var tt = '农历' + this.cDay(lDObj.month, lDObj.day);
        lDObj = null;
        return tt;
    };
    this.weekday = function(){
        var day = ["周日", "周一", "周二", "周三", "周四", "周五", "周六"];
        return day[this.dateObj.getDay()];
    };
    this.YYMMDD = function(){
        var dateArr = [this.SY, '年', this.SM + 1, '月', this.SD, '日'];
        return dateArr.join('');
    }
}

使用方法:

<html>
    <head>
        <title>
            农历类测试
        </title>
        <script type="text/javascript" src="cc.js"></script>
    </head>
    <body>
        <script type="text/javascript">
            var date = new ChineseCalendar();
            document.write("农历："+date.solarDay2());
           
            document.write("星期："+date.weekday());
           
            document.write("日期："+date.YYMMDD());
               
        </script>
    </body>
</html>