如何用循环实现下拉框

Question

<select name="year" size="1">
<script language="javascript">
   for(var i = 1900; i < 2500;i++)
    document.write('<option value=\"'+i+'\" selected>'+i+'</option>');   
</script>
</select>

Answer 1

<select name="year" size="1">
<script>
for (var i=1999;i<=new Date().getYear();i++)document.write("<option value="+i+">"+i+"</option>");
</script>
</select>

Answer 2

<script language="JavaScript">
<!--
document.write("<select name=\"year\" size=\"1\">";
for (loop=1999; loop < 2003; loop++)
{
    document.write("<option value=\"" + loop + "\" selected>" + loop + "</option>");
}
document.write("</select>");
//-->
</script>