script language="javascript">
!--
var str="123";
%
String aa;
%>
-->
/script>

script language="javascript">
function returnValue(){
var myform=document.form1;
var str=myform.text1.value;
%
String aa;
//怎么讓這個aa 等于js中的str???
%>
}
/script>
form name="form1">
input type="text" name="text1" onchange="returnValue();">
/form>

form name="form1">
input type="hidden" name="hide">
/form>
script中定義var str=“123”;
document.form1.hide.value=str;