非常酷的javascript实现万年历功能

以下为详细代码

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style type="text/css">
body{ margin:0px; padding:0px; font-size:12px; line-height:22px; font-family:tahoma,"宋体",Simsun, "Microsoft YaHei","Arial Unicode MS", Mingliu, Arial, Helvetica;}
table{ background:#999999; width:600px; margin:0px auto; text-align:center;}
table td{ background:#FFFFFF;}
table th{ background:#CCCCCC;}
.calendar{ width:600px; margin:2px auto; height:auto; overflow:hidden; text-align:center;}
.calendar a{text-decoration:none; font-size:14px; display:inline-block; width:30px;}
.calendar a:hover{ background:#BFBFBF;}
.calendar .left{ float:left; width:100px;}
.calendar .now_month{ float:left; width:400px;}
.calendar .right{ float:right; width:100px;}
.red{ color:#FF0000;}
.copyright{ width:600px; margin:16px auto;}
</style>
<script type="text/javascript">
/*
power By: http://www.wxwdesign.cn
Author: 流水涵清
*/
//创建calendar类
function calendar(y,m){
  var c=new Date(y,m,1,0,0,0,0);  //当月第一天
  this.daynum=getMonthDays(m+1,y);  //获得当月的天数
  this.firstday=c.getDay();  //当月第一天星期几
}

//获取某一月的天数
function getMonthDays(m,y){
  var d=[31,28,31,30,31,30,31,31,30,31,30,31];
  if(m==2){if(check(y)){return 29;}else{return 28;}}else{return d[m-1];}
  function check(year){
    if(year%100==0){if(year%400==0){return true;}else{return false;}}else{if(year%4==0){return true;}else{return false;}}
  }
}

//初始化显示
function init_calendar(){
var now=new Date();
var year=now.getFullYear();
var month=now.getMonth();
var day=now.getDay();
var date=now.getDate();
var c=document.getElementById("calendar");
var show=document.getElementById("show");
var a=c.getElementsByTagName("a");
var div=c.getElementsByTagName("div");
var ca=new calendar(year,month);
a[1].onclick=function(){month--;if(month<0){year--;month=11;};ca=new calendar(year,month);show_calendar();}
a[2].onclick=function(){month++;if(month>11){year++;month=0;};ca=new calendar(year,month);show_calendar();}
a[0].onclick=function(){year--;ca=new calendar(year,month);show_calendar();}
a[3].onclick=function(){year++;ca=new calendar(year,month);show_calendar();}
function show_calendar(){
   div[1].innerHTML=year+"年"+(month+1)+"月";
   var f="<table border=\"0\" cellspacing=\"1\">";
   f+="<tr><th scope=\"col\" class='red'>日</th><th scope=\"col\">一</th><th scope=\"col\">二</th><th scope=\"col\">三</th><th scope=\"col\">四</th><th scope=\"col\">五</th><th scope=\"col\" class='red'>六</th></tr>";
   f+="<tr>";
   if(ca.firstday>0){for(var i=0;i<ca.firstday;i++){f+="<td></td>";}}
   for(var i=ca.firstday,j=1;j<ca.daynum+1;i++,j++){
     if(i%7==0&&i>0){f+="</tr><tr>";}
     if(i%7==0||(i+1)%7==0){f+="<td class='red'>"+j+"</td>";}else{f+="<td>"+j+"</td>";}
   }
   if(7>(7-(ca.daynum+ca.firstday)%7)>0){for(var i=0;i<(7-(ca.daynum+ca.firstday)%7);i++){f+="<td></td>";}}
   f+="</tr></table>";
   show.innerHTML=f;
}
show_calendar();
}
window.onload=init_calendar;
</script>
<title>javascript_calendar</title>
</head>

</body>
</html>