<%     String username = (String)session.getAttribute("username");     UserService userService=new UserServiceImpl();     System.out.println("username=============>"+username);     int role = userService.getRoleByUsername(username);     System.out.println("role=============>"+role);     if(role==0){  %>  <script type="text/javascript">          function add(){              window.location="<%=request.getContextPath() %>/jsp/billAdd.jsp";          }  </script>    <%}else{ %>      <script type="text/javascript">          function add(){              alert("你不是管理员，没有新增的权限！");  }  </script>  <%} %><em><input value="添加账单" class="input-button" onclick="add();" type="button">