js年月日

最新推荐文章于 2025-04-11 15:47:45 发布

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最新推荐文章于 2025-04-11 15:47:45 发布

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文章标签： javascript html action function

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form name="d_reg_form" id="d_reg_form" action="">
<select   name="year"   size="1"   onChange="return CheckDay();">
                     <script language="javascript">
                        for(i=2020;i>=1940;i--)
                            {
                                document.write('<option   value="'+i+'">'+i+'</option>')
                            }
                     </script>
</select>年
<select name="month"   size="1"   onChange="return CheckDay();">
                        <option   value="1">1</option>
                        <option   value="2">2</option>
                        <option   value="3">3</option>
                        <option   value="4">4</option>
                        <option   value="5">5</option>
                        <option   value="6">6</option>
                        <option   value="7">7</option>
                        <option   value="8">8</option>
                        <option   value="9">9</option>
                        <option   value="10">10</option>
                        <option   value="11">11</option>
                        <option   value="12">12</option>
</select>月
<select   name="day"   size="1"></select>日
<script>
function CheckDay(){

    var   YearNo,MonthNo,DayNo;
    YearNo   =   document.d_reg_form.year.value;
    MonthNo   =   document.d_reg_form.month.value;

    var   i,j,DayCount;

    if(MonthNo==1 || MonthNo==3 || MonthNo==5 || MonthNo==7 || MonthNo==8 || MonthNo==10 || MonthNo==12)
    {DayCount = 31;}

    if(MonthNo==4 || MonthNo==6 || MonthNo==9 || MonthNo==11 )
    {DayCount = 30;}

    if(MonthNo==2){
           if(IsRunY(YearNo)){
               DayCount = 29;
           }else{
               DayCount = 28;
           }
    }

    document.d_reg_form.day.length=DayCount;
    for (i=0;i<=DayCount-1;i++)
    {
       document.d_reg_form.day[i]=new Option(i+1);
       document.d_reg_form.day[i].value=i+1;
    }
}

function IsRunY(YearNo)
{
    // 能被4整除却不能被100整除或能被400整除的年份
    // 则是闰年
    if ((YearNo % 4 == 0 && YearNo % 100 != 0) || YearNo % 400 == 0){
        return true;
    }else{
        return false;
    }

}
CheckDay();
</script>
</form>
</body>
</html>