javascript版的日期输入控件

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META CONTENT="Microsoft FrontPage 5.0">
<META CONTENT="zhaoweiwei">
<META CONTENT="birthday_input">
<META CONTENT="日起输入控件">
<script>
function showdb() file://显示控件/隐藏空间
{
    var CurrentDate=new Date();
    var CYear=CurrentDate.getFullYear();
    var CMonth=CurrentDate.getMonth();
    var CDay=CurrentDate.getDay();

    var a=document.getElementById("input_birth");

    var obj_year=document.getElementById("year"); file://当展开控件时自动取到当前时间（客户端）
    obj_year.innerText=CYear;
    var obj_month=document.getElementById("month");
    obj_month.innerText=CMonth+1;

    var s=new Date(CYear,CMonth,1);
    var startDay=s.getDay();   file://日期起始数字
    var numDays=numberOfDays(CMonth,CYear); file://本月天数
    var day=document.getElementsByName("day");
    for(var j=1;j<=numDays;j++) file://插入日期
{
    day[startDay+j-1].innerText=j;
}

    if(a.style.visibility=='visible')
    {
     a.style.visibility='hidden';
    }
else
{
    a.style.visibility='visible';
}

}
function addyear()
   {
   var obj_year=document.getElementById("year");
   var obj_month=document.getElementById("month");

var num_year=obj_year.innerText;

   obj_year.innerText=parseInt(num_year)+1; file://年数增加

   displayCalendar(obj_month.innerText-1,obj_year.innerText);
}
function plusyear()
   {

   var obj_year=document.getElementById("year");
   var obj_month=document.getElementById("month");

   var num_year=obj_year.innerText;
   obj_year.innerText=parseInt(num_year)-1; file://年数减少

   displayCalendar(obj_month.innerText-1,obj_year.innerText);
}
function addmonth()
{

     var obj_month=document.getElementById("month");
     var obj_year=document.getElementById("year");

     if(parseInt(obj_month.innerText)>=12)        file://月数增加到12时，年数相应增加1，月数从1开始
     {
      obj_month.innerText="0";
      obj_year=document.getElementById("year");
      var num_year=obj_year.innerText;
      obj_year.innerText=parseInt(num_year)+1;
     }

       var num_month=obj_month.innerText;
      obj_month.innerText=parseInt(num_month)+1; file://月数增加

     displayCalendar(obj_month.innerText-1,obj_year.innerText);
    }
    function plusmonth()
    {

     var obj_month=document.getElementById("month");
     var obj_year=document.getElementById("year");

    if(parseInt(obj_month.innerText)<=1)    file://月数减少到1时，年数相应减少1，月数从12开始
   {
      obj_month.innerText="13";
      obj_year=document.getElementById("year");
      var num_year=obj_year.innerText;
      obj_year.innerText=parseInt(num_year)-1;
     }

     var num_month=obj_month.innerText;
   obj_month.innerText=parseInt(num_month)-1; file://月数减少

displayCalendar(obj_month.innerText-1,obj_year.innerText);
}

function numberOfDays(month,year) file://取得每月天数，判断平年闰年
{
    var numDays=new Array(31,28,31,30,31,30,31,31,30,31,30,31);
    n=numDays[month];
    if(month==1&&year%4==0) ++n;
    return n;
}

function displayCalendar(month,year)
{

function add_day(year,month,day)
{
bd.birthdate.value=year+"-"+month+"-"+day;
}
</script>
</HEAD>

    < td colspan="3">   <input type="button" value="<<">
      <input type="button" value="<"> <font>
      </font>年<font></font>月
      <input type="button" value=">">
      <input type="button" value=">>" ></td>
    </tr>
     <tr>
      <td colspan="3" valign="top">
     <table cellpadding="0" cellspacing="0" bordercolor="#111111">
        <tr>
        <td><b><font color="#FF0000">日</font></b></td>
        <td><b>一</b></td>
        <td><b>二</b></td>
        <td><b>三</b></td>
        <td><b>四</b></td>
        <td><b>五</b></td>
        <td><b><font color="#FF0000">六</font></b></td>
      </tr>
      <tr>
        <td ></td>
        <td >　</td>
        <td >　</td>
        <td >　</td>
        <td >　</td>
        <td >　</td>
        <td >　</td>
        </tr>
        <tr>
          <td >　</td>
        <td >　</td>
        <td >　</td>
        <td >　</td>
        <td >　</td>
        <td >　</td>
        <td >　</td>

</tr>
      <tr>
        <td >　</td>
        <td >　</td>
        <td >　</td>
        <td >　</td>
        <td >　</td>
        <td >　</td>
        <td >　</td>
      </tr>
      <tr>
        <td >　</td>
        <td >　</td>
        <td >　</td>
        <td >　</td>
        <td >　</td>
        <td >　</td>
        <td >　</td>
      </tr>
      <tr>
        <td >　</td>
        <td >　</td>
        <td >　</td>
        <td >　</td>
        <td >　</td>
        <td >　</td>

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