sumq=app2(req1,rqe2);这种语法不行吗？
<script type="text/javascript">
function app2(x,y)
{ var sum,x,y;
sum = x * y;
return sum;
}
var req1,req2,sumq;
req1 = app2(5,6);
req2 = app2(2,3);
sumq=app2(req1,rqe2);
document.write("req1的值:"+req1+"<br/>");
document.write("req2的值:"+req2+"<br/>");
document.write(req1+"与"+req2+"和:"+sumq);
</script>
