jfinal二级联动

<select id="s1"  onChange="move()">

 <option value="">请选择所在省份 </option> 

<c:forEach items="${area }" var="ele">

  <option value="${ele.area_name }">${ele.area_name }</option>

 </c:forEach>

</select>
<select id="s2" name="information.user_school">
   <option value="">--请选择学校--</option>

</select>

<script>
     function move()
     {
         var s1=document.getElementById("s1");
         var s2=document.getElementById("s2");
         s2.length=0;
         <c:forEach items="${school }" var="ele"> 
       if(s1.value == "${ele.area_name}") {
        var ss = new Option();
        ss.text = "${ele.school_name}"
        ss.value = "${ele.school_name}"
        s2.add(ss);
       }
         </c:forEach>




     }
</script>