实现年月日下拉菜单的javascript代码示例

<script language="JavaScript">
function mydate(dateid,datename){ //Powered by yayap
var dateid,datename,i;
var j=1;
document.write('<select name="'+datename+'" size="1">'+'onChange="'+'alert("ddd");'+'"');
// <select name="select" size="1" onChange="alert(document.all.form1.select[selectedIndex].value)">
if (dateid>2001) j=2002
else i=j
for (i=j ;i<=dateid ;i++)
{
document.write('<option value="'+i+'">'+i+'</option>')
};
document.write('</select>');
}
mydate(2004,'year1');
mydate(12,'month1');
mydate(31,'day1');
//document.write(document.all.form1.year1.options[selectedIndex].value);
</script>