<SELECT id="Select1" name="Select1" onchange="alert(this.selectedIndex)">
<OPTION value="a" selected>a</OPTION>
<OPTION value="b" selected>b</OPTION>
<OPTION value="c" selected>c</OPTION>
<OPTION value="d" selected>d</OPTION>
</SELECT>
<OPTION value="a" selected>a</OPTION>
<OPTION value="b" selected>b</OPTION>
<OPTION value="c" selected>c</OPTION>
<OPTION value="d" selected>d</OPTION>
</SELECT>
{
for(iIndex=0;iIndex<ObjectID.length;iIndex++)
{
if(ObjectID.options[iIndex].selected)
{
return ObjectID.options[iIndex].text;//或者ObjectID.options[iIndex].value;
}
}
return null;
}
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>无标题文档</title>
<script language="JavaScript">
function getindex(indexnum)
{
alert(+indexnum);
}</script>
</head><body>
<form name="form1" >
<select name="selectname" onChange="getindex(this.form.selectname.selectedIndex)">
<option value=""></option>
<option value="1">选项一</option>
<option value="2">选项二</option>
<option value="3">选项三</option>
<option value="4">选项四</option>
<option value="5">选项五</option>
</select>
</form>
</body>
</html>