如何将scriptlet设置为scriptlet JavaScript变量

Question

<% String email =(String) request.getSession().getAttribute("email"); 
   session.setAttribute("email", email);
%>

<script>
function test() {
var email = ${fn:escapeXml(email)}
}
</script>

以上操作无效 我也尝试过使用引号"${fn:escapeXml(email)}"; or '${fn:escapeXml(email)}'; or "${fn:escapeXml(email)};" ....他们都没有工作。我也尝试过

如果我<span id="email" value="${fn:escapeXml(email)}">${fn:escapeXml(email)}</span>

它说找不到函数fn：escapeXml

我收到的错误消息是：Uncaught SyntaxError: Invalid or unexpected token 如何在JavaScript中将scriptlet设置为变量？