js获取下拉列表的值

   <script language="javascript">
         function getSelect(){

/***************第一种方式********/
           var factor=document.getElementById('hi');
           var fa=factor.selectedIndex;
           var username= factor.options[fa].value;

/***************第二种方式********/
           var user=document.getElementById('hi').options[document.getElementById('hi').selectedIndex].text;
           alert(username+'==========='+user);
     }
     </script>

    <select name="hi" onchange="getSelect();" id='hi'>
                <option>一</option>
                <option value="02">二</option>
                <option>三</option>
                <option value="04">四</option>
   </select>