我试图在成功预订车辆后显示一条提醒消息以及预订 ID，但它不起作用。预订后未显示提醒消息。
out.println("<html>");
out.println("<head>");
out.println("<script>");
out.println("<alert('Booking Added Successfully.\nYour Booking Reference Number Is" + booking.getBookingID() + "')>");
out.println("</script>");
out.println("<META HTTP-EQUIV= Refresh CONTENT=0;URL=BookNewVehicle.jsp>");
out.println("</head>");
out.println("</html>");
最佳答案
您添加了小括号<>内部警报:
out.println("<html>");
out.println("<head>");
out.println("<script>");
out.println("alert('Booking Added Successfully.\nYour Booking Reference Number Is" + booking.getBookingID() + "')"); //You should remove the brackets
out.println("</script>");
out.println("<META HTTP-EQUIV= Refresh CONTENT=0;URL=BookNewVehicle.jsp>");
out.println("</head>");
out.println("</html>");
关于无法从数据库检索数据的 JavaScript 警报消息，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/30121502/