<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<script>
function chooseMonth(){
document.form.month.options.length = 0;
var newOption;
for(var i = 1 ;i <= 12;i++){
newOption = new Option(i,i);
document.form.month.options.add(newOption);
}
}
function chooseDay(){
document.form.day.options.length = 0;
var month = document.form.month.value;
var year = document.form.year.value;
var newOption;
switch (month)
{
case "4":
case "6":
case "9":
case "11":
for(var i = 1;i<=30;i++){
newOption = new Option(i,i);
document.form.day.options.add(newOption);
}
break;
case "2":
if(year%400 == 0 ||(year%4 == 0&& year%100 != 0)){
for(var i = 1; i <= 29;i++){
newOption = new Option(i,i);
document.form.day.options.add(newOption);
}
}
else{
for(var i = 1; i <= 28;i++){
newOption = new Option(i,i);
document.form.day.options.add(newOption);
}
}
break;
default:
for(var i = 1; i <= 31;i++){
newOption = new Option(i,i);
document.form.day.options.add(newOption);
}
break;
}
}
</script>
</HEAD>
<BODY>
<form name="form">
<select name="year" onChange="chooseMonth()">
<option>--请选择年--</option>
<script>
for(var i = 1970;i<=2020;i++ ){
document.write("<option value='"+i+"'>"+i+"</option>");
}
</script>
</select>年
<select name="month" onChange="chooseDay()">
<option>--请选择月--</option>
</select>月
<select name="day">
<option>--请选择日--</option>
</select>日
</form>
</BODY>
</HTML>
常用的javascript的特效
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2008-09-24
08:59:12
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