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<html>
<body>
<form>
<select id=year onchange=toDate()>
<script>for(i=1970;i<=2010;i++)document.write("<option>"+i+"</option>")</script>
</select>
<select id=month onchange=toDate()>
<script>for(i=1;i<=12;i++)document.write("<option>"+i+"</option>")</script>
</select>
<select id=day onchange=toDay()></select>
<input name=weekday>
</form>
</body>
<script>
var arr="日一二三四五六".split("")
function toDate(){
with(document.all){
vYear=parseInt(year.options[year.selectedIndex].text)
vMonth=parseInt(month.options[month.selectedIndex].text)
day.length=0;
for(i=0;i<(new Date(vYear,vMonth,0)).getDate();i++)
{
day.options[day.length++].value=day.length;day.options[day.length-1].text=day.length;}
}
toDay();
}
function toDay(){
vDay=parseInt(document.all.day.options[document.all.day.selectedIndex].value)
document.all("weekday").value="星期"+arr[new Date(vYear,vMonth-1,vDay).getDay()]
}
window.onload=toDate;
</script>
</html>
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