<%
if("a".equals(request.getParameter("msg").toString())){
out.write("<script>alert('已成功加入书架！')</script>");
}
if("b".equals(request.getParameter("msg").toString())){
out.write("<script>alert('请先登录！')</script>");
}
%>
请大神纠错，谢谢
------解决方案--------------------------------------------------------
有什么问题嘛