When login fails
resp.sendRedirect("/car2/login.jsp?error=yes");
login.jsp
<script type="text/javascript">
var errori ='<%=request.getParameter("error")%>';
if(errori=='yes'){
alert("账号或密码错误!");
}
</script>
When login fails
resp.sendRedirect("/car2/login.jsp?error=yes");
login.jsp
<script type="text/javascript">
var errori ='<%=request.getParameter("error")%>';
if(errori=='yes'){
alert("账号或密码错误!");
}
</script>