拜托各位,谢谢.

Question

<select name="CSDN" style="width: 80pt; " >
<option value="EF1EAEC45E01445F9347710F8E757458" >陈是</option>
<option value="FB1B63DA50F2452A9DAD11ABEE57E2A3"  selected >徐先</option>
<option value="B57F8AA7E9CE4746A0C3E055CEF6D1B9"   >袁梅</option>
<option value="4473CBC94FDA4B908CDD6C4A10BDFC7A"   >吴雄</option>
<option value="73DC6A83EAD440C99E653C201C33A192"   >刘庆</option>
<option value="4473CBC94FDA4B908CDD6C4A10BDFC7A"   >国海</option>
<option value="EFF1F2713DD94022A4079256D79F69E4"   >欧阳</option>
<option value="2D2953ACCCA944698606C43E94B31A70"   >少梅</option>
    </select>
<script>
o = document.getElementsByName("CSDN")[0];
for(c=0;c<o.length;c++)
{
if(o.options[c].text=="徐先") alert(o[c].value);
}
</script>

Answer 1

<script language="JavaScript">
<!--
alert(document.all.CSDN.options[document.all.CSDN.selectedIndex].innerText);
//-->
</script>

Answer 2

<select id="CSDN" style="width: 80pt;">
<option value="EF1EAEC45E01445F9347710F8E757458" >陈是</option>
<option value="FB1B63DA50F2452A9DAD11ABEE57E2A3"  selected >徐先</option>
<option value="B57F8AA7E9CE4746A0C3E055CEF6D1B9"   >袁梅</option>
<option value="4473CBC94FDA4B908CDD6C4A10BDFC7A"   >吴雄</option>
<option value="73DC6A83EAD440C99E653C201C33A192"   >刘庆</option>
<option value="4473CBC94FDA4B908CDD6C4A10BDFC7A"   >国海</option>
<option value="EFF1F2713DD94022A4079256D79F69E4"   >欧阳</option>
<option value="2D2953ACCCA944698606C43E94B31A70"   >少梅</option>
</select>
<script type="text/javascript">
obj=document.getElementById("CSDN");
alert(obj.options[obj.selectedIndex].text);
</script>