关于在jsp中执行Java代码的问题

Question

如图所示，

Answer 1

要么就去掉

<script type="text/javascript" charset="utf-8"></script>

只保留

window.location.href="";

或者可以换一种思路

<script type="text/javascript" charset="utf-8">
var code ='<%=code>'
if(code == null || code ==''){
    window.location.href="";
}
</script>'