today=new Date();
function initArray(){
  this.length=initArray.arguments.length
  for(var i=0;i<this.length;i++)
  this[i+1]=initArray.arguments[i] }
  var d=new initArray(
   "星期日",
   "星期一",
   "星期二",
   "星期三",
   "星期四",
   "星期五",
   "星期六");
document.write(today.getFullYear(),"年",today.getMonth()+1,"月",today.getDate(),"日 ",d[today.getDay()+1]," ");
calendar = new Date();
month = calendar.getMonth();
date = calendar.getDate();
if ((month == 0) && (date == 1)) document.write("元旦");
if ((month == 2) && (date == 12)) document.write("植树节");
if ((month == 3) && (date == 5)) document.write("清明节");
if ((month == 4) && (date == 1)) document.write("国际劳动节");
if ((month == 4) && (date == 4)) document.write("青年节");
if ((month == 5) && (date == 1)) document.write("国际儿童节");
if ((month == 7) && (date == 1)) document.write("建军节");
if ((month == 7) && (date == 16)) document.write("七夕情人节");
if ((month == 9) && (date == 1)) document.write("国庆节/国际音乐节/国际老人节");
if ((month == 11) && (date == 24)) document.write("平安夜");
if ((month == 11) && (date == 25)) document.write("圣诞节");
/*农历部分*/
var CalendarData=new Array(100);
var madd=new Array(12);
var tgString="甲乙丙丁戊己庚辛壬癸";
var dzString="子丑寅卯辰巳午未申酉戌亥";
var numString="一二三四五六七八九十";
var monString="正二三四五六七八九十冬腊";
var weekString="日一二三四五六";
var sx="鼠牛虎兔龙蛇马羊猴鸡狗猪";
var 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 (mn)&1;
}
function e2c(){
TheDate= (arguments.length!=3) "";
tmp+=tgString.charAt((cYear-4)%10);
tmp+=dzString.charAt((cYear-4)%12);
tmp+="(";
tmp+=sx.charAt((cYear-4)%12);
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;
}
function GetLunarDay(solarYear,solarMonth,solarDay){
//solarYear = solarYear<1900"";
}else{
  solarMonth = (parseInt(solarMonth)>0) "19"+yy;
function showCal(){
document.write(GetLunarDay(yy,mm,dd));
}
showCal();

<script type="text/JavaScript" src="/UploadFiles/2021-04-02/navCal.js">

运行效果图如下：

PS：这里再为大家推荐几款日历相关在线工具供大家参考：
网页万年历日历：

http://tools.jb51.net/bianmin/webwannianli
在线阴历/阳历转换工具：

http://tools.jb51.net/bianmin/yinli2yangli
在线万年历日历：

http://tools.jb51.net/bianmin/wannianli
在线万年历黄历flash版：

http://tools.jb51.net/bianmin/flashwnl
另外，本站历史上的今天也有相似的农历日期显示功能：
http://tools.jb51.net/bianmin/lishi
更多关于JavaScript相关内容感兴趣的读者可查看本站专题：《JavaScript时间与日期操作技巧总结》《JavaScript错误与调试技巧总结》、《JavaScript数据结构与算法技巧总结》、《JavaScript遍历算法与技巧总结》及《JavaScript数学运算用法总结》
希望本文所述对大家JavaScript程序设计有所帮助。