<html>
<body>
<select id="SelectYear"></select>年
<select id="SelectMonth"></select>月
<select id="SelectDay"></select>日
</body>
<script type="text/javascript">
var selectYear = $("SelectYear");
var selectMonth = $("SelectMonth");
var selectDay = $("SelectDay");function $(id) { return document.getElementById(id); }
function appendOption(select, text, value)
{
var result = document.createElement("option");
result.text = text;
result.value = value;
select.options.add(result);
return result;
}
function updateSelectDay()
{
var year = selectYear.options[selectYear.selectedIndex].value;
var month = selectMonth.options[selectMonth.selectedIndex].value;
var date= new Date(year, month, 0);
var day = date.getDate();
for (var i = selectDay.options.length - 1; i >= day; i--)
selectDay.options.remove(i);
for (var i = 1; i <= day; i ++)
if (i > selectDay.options.length)
appendOption(selectDay, i, i);
}//初始化
selectYear.onchange = function()
{
updateSelectDay();
}
selectMonth.onchange = function()
{
updateSelectDay();
}var today = new Date();
for (var i = 1970; i <= 2070; i++)
{
appendOption(selectYear, i, i);
if (i == today.getYear()) selectYear.selectedIndex = selectYear.options.length - 1;
}
for (var i = 1; i <= 12; i++)
{
appendOption(selectMonth, i, i);
if (i == today.getMonth()) selectMonth.selectedIndex = selectMonth.options.length - 1;
}
updateSelectDay()
selectDay.selectedIndex = today.getDate() - 1;
</script>
</html>
<body>
<select id="SelectYear"></select>年
<select id="SelectMonth"></select>月
<select id="SelectDay"></select>日
</body>
<script type="text/javascript">
var selectYear = $("SelectYear");
var selectMonth = $("SelectMonth");
var selectDay = $("SelectDay");function $(id) { return document.getElementById(id); }
function appendOption(select, text, value)
{
var result = document.createElement("option");
result.text = text;
result.value = value;
select.options.add(result);
return result;
}
function updateSelectDay()
{
var year = selectYear.options[selectYear.selectedIndex].value;
var month = selectMonth.options[selectMonth.selectedIndex].value;
var date= new Date(year, month, 0);
var day = date.getDate();
for (var i = selectDay.options.length - 1; i >= day; i--)
selectDay.options.remove(i);
for (var i = 1; i <= day; i ++)
if (i > selectDay.options.length)
appendOption(selectDay, i, i);
}//初始化
selectYear.onchange = function()
{
updateSelectDay();
}
selectMonth.onchange = function()
{
updateSelectDay();
}var today = new Date();
for (var i = 1970; i <= 2070; i++)
{
appendOption(selectYear, i, i);
if (i == today.getYear()) selectYear.selectedIndex = selectYear.options.length - 1;
}
for (var i = 1; i <= 12; i++)
{
appendOption(selectMonth, i, i);
if (i == today.getMonth()) selectMonth.selectedIndex = selectMonth.options.length - 1;
}
updateSelectDay()
selectDay.selectedIndex = today.getDate() - 1;
</script>
</html>
<html>
<body>
<select id="SelectYear"></select>年
<select id="SelectMonth"></select>月
<select id="SelectDay"></select>日
</body>
<script type="text/javascript">
var selectYear = $("SelectYear");
var selectMonth = $("SelectMonth");
var selectDay = $("SelectDay");function $(id) { return document.getElementById(id); }
function appendOption(select, text, value)
{
var result = document.createElement("option");
result.text = text;
result.value = value;
select.options.add(result);
return result;
}
function updateSelectDay()
{
var year = selectYear.options[selectYear.selectedIndex].value;
var month = selectMonth.options[selectMonth.selectedIndex].value;
var date= new Date(year, month, 0);
var day = date.getDate();
for (var i = selectDay.options.length - 1; i >= day; i--)
if (selectDay.remove) selectDay.remove(i)
else selectDay.options.remove(i);
for (var i = 1; i <= day; i ++)
if (i > selectDay.options.length)
appendOption(selectDay, i, i);
}//初始化
selectYear.onchange = function()
{
updateSelectDay();
}
selectMonth.onchange = function()
{
updateSelectDay();
}var today = new Date();
for (var i = 1970; i <= 2070; i++)
{
appendOption(selectYear, i, i);
if (i == today.getFullYear()) selectYear.selectedIndex = selectYear.options.length - 1;
}
for (var i = 1; i <= 12; i++)
{
appendOption(selectMonth, i, i);
if (i == today.getMonth()) selectMonth.selectedIndex = selectMonth.options.length - 1;
}
updateSelectDay()
selectDay.selectedIndex = today.getDate() - 1;
</script>
</html>
<!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>
<title></title>
<script type="text/javascript">
function test(m){
var daysMonth = new Array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);//定义1~12月的天数
document.getElementById("Select2").innerHTML ="";
for(var i=0;i<daysMonth[m-1];i++){
var oOption = document.createElement("option");
document.getElementById("Select2").add(oOption);
oOption.innerText = i+1;
}
}
</script>
</head>
<body>
<select id="Select1" onchange="test(this.options[this.selectedIndex].value)">
<option selected="selected" 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>
<select id="Select2">
</select></body>
</html>