如果用户端上的动态更新产生网页配置的问题，或者您要在进行验证之前执行某些伺服端程式码，这会很有帮助。

This is useful if dynamic updating on the client creates problems with the layout of the page, or if you want to execute some server code before validation takes place.

youdao

如果用户端上的动态更新产生网页配置的问题，或者您要在进行验证之前执行某些伺服端程式码，这会很有帮助。

This is useful if dynamic updating on the client creates problems with the layout of the page, or if you want to execute some server code before validation takes place.

youdao