选择(年月日)自动计算出当天是星期几?如2008-06-28 星期二
<html>
<head>
<title>作者：factly</title>
</head>
<body>
<form>
<select id="year" onchange="toDate()">
<script>for(i=1980;i<=2020;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>
<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>
</body>
</html>
