没问题啊!
formname.objname.length!
EG:<form name=form1><select name=aa><option></option></select><select name=aa></select><select name=aa></select><select name=aa></select><select name=aa></select><select name=aa></select></form>
<script>
alert(form1.aa.length)
</script>
formname.objname.length!
EG:<form name=form1><select name=aa><option></option></select><select name=aa></select><select name=aa></select><select name=aa></select><select name=aa></select><select name=aa></select></form>
<script>
alert(form1.aa.length)
</script>
如何判断只有一个Select元素
1)<form name=form1>
<select name=aa>
<option></option>
<option></option>
</select>
</form>form1.aa.length=22)<form name=form1>
<select name=aa><option></option></select>
<select name=aa><option></option></select>
</form>form1.aa.length=2