<script language="javascript">
var s ="<select><option value=0> </option>"
for(var k=1;k<5;k++){
s+="<option value="+k+">"+k+"</option>"
}
s+="</select>"
it.innerHTML = s
alert( it.innerHTML)
</script>
var s ="<select><option value=0> </option>"
for(var k=1;k<5;k++){
s+="<option value="+k+">"+k+"</option>"
}
s+="</select>"
it.innerHTML = s
alert( it.innerHTML)
</script>
<option value=asdf>asdf</option>
</select>
<input type="button" onclick="test()" value="测试">
<script language="javascript">
function test(){
var sel = document.all['dd'];
var Opt = sel.document.createElement("OPTION");
Opt.text = "aaa";
Opt.value = "aaa";
sel.options.add(Opt);
}
</script>