This gives users instant feedback on validation errors; without the client script, checking for validation errors would require a round trip to the server, which could be slow at times.

• 这为用户提供了有关验证错误的即时反馈;在不使用客户端脚本的情况下,对验证错误的检查将需要执行一个到服务器的往返过程,该过程有时可能会很慢。