上代码
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
</head>
<body>
<dl>
<dt>出生日期：</dt>
<dd><select id="year">
<script>
for(var i=1900;i<=2015;i++){
document.write("<option value="+i+">"+i+"</option>");
}
</script>
</select>年
<select id="month">
<script>
for(var i=1;i<=12;i++){
document.write("<option value="+i+">"+i+"</option>");
}
</script>
</select>月
<select id="day">
<script>
for(var i=1;i<=31;i++){
document.write("<option value="+i+">"+i+"</option>");
}
</script>
</select>日</dd>
</dl>
</body>
</html>