怎么用javascript 判断
[code=HTML]
<select name= "select ">
<option value= " "> 请选择 </option>
<option value= "A "> A </option>
<option value= "B "> B </option>
<option value= "C "> C </option>
<option value= "D "> D </option>
<option value= "E "> E </option>
</select>
[/code]
document.form1.select.value== " "这样接收不到值
假如为空就提示！！
你没有form1,当然没值
document. select .value
HTML code:
<select name= "select" id="select">
<option value= " "> 请选择 </
<form id="form1" runat="server">
<div>
<script type="text/javascript">
function oo(a){
document.getEleme ......
