blocks|key|1464078|text|JSP是一种服务器端技术。也就是说，服务器解析/编译所有信息，然后将其发送到客户端(即您的浏览器)。然后..。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1464079|如果接收到的数据包含任何javascript，浏览器就会在自己的javascript虚拟机中对其进行解释，而服务器也早已被遗忘，因为HTTP是无状态协议。|1464080|考虑到“不推荐在web上使用JS”，我不会为此而烦恼。大多数站点广泛使用JS，因此在客户端关闭JS将使它们变得无用。|1464081|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

JSP is a server side technology. That is - Server parses/compiles all the information and then sends it to the client (i.e. your browser). And then..

If received data contains ANY javascript then browser interprets it in its own javascript VM and server is long forgotten by then since HTTP is stateless protocol.

Considering "not recommending JS in web" I wouldn't bother about it. Most of the sites use JS extensively thus turning it off on the client side would render them mostly useless.

blocks|key|1464138|text|我知道这是个老生常谈的问题，但我想不管怎样，我还是要插话。我认为你应该在目前这个时期使用javascript，因为它允许非常丰富的用户体验，并且有了像jQuery+(我个人最喜欢的)，prototype和mootools这样的js库，将javascript集成到你的应用程序中变得非常容易，只需要很少的努力。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1464139|如果您正确地设计了您的应用程序，您可以添加javascript来丰富用户体验(并使他们更容易使用您的站点/应用程序)，而无需额外的服务器开销和极少的工作量。|1464140|然而，你的网站不应该依赖于javascript的功能，因为用户的浏览器可能不支持它。|1464141|Javascript应该不引人注目，并为那些支持它的用户提供更丰富的体验。|1464142|这是一篇关于UI和优雅升级的好文章，而不是为用户浏览器的失败而设计的。http://realtech.burningbird.net/javascript/accessibility/gracefully-upgrading|offset|length|1464143|entityMap|0|LINK|mutability|MUTABLE|url|http://realtech.burningbird.net/javascript/accessibility/gracefully-upgrading^0|0|0|0|0|Z|25|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|V|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|W|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|X|8|@]|9|@$J|Y|K|Z|1|10]]|A|$]]|$1|L|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S]]]]

I know this is a very old question but I thought I would pipe in anyways. I think you should use javascript in this current time period as it allows for a very rich user experience and with js libraries like jQuery (my personal favorite), prototype and mootools it has become very easy to integrate javascript into your application with little effort.

If you design your application right, you can add javascript that enriches the user's experience (and can make it easier for them to use your site/application) without additional server overhead and very little effort.

How ever - your site should not rely on the javascript for function as the user's browser may not support it.

Javascript should be unobtrusive and provide a richer experience to those user's who support it.

Here is a good article about UI and upgrading gracefully instead of designing for the failure of the user's browser. <a href="http://realtech.burningbird.net/javascript/accessibility/gracefully-upgrading" rel="nofollow noreferrer">http://realtech.burningbird.net/javascript/accessibility/gracefully-upgrading</a>

blocks|key|1679437|text|他的意思是“不要使用java+scriptlet”，这是<%25+%25>之间的东西。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1679438|最大的原因必须是可维护性和调试；scriptlet使一切都变得非常困难。|1679439|另一方面，如果你实现了标记库，你可以将任何逻辑提取到一个真正的java类中，这很容易调试，而且你仍然可以在一个可视化的xml/html编辑器中打开东西，因为标记库是一个有效的xml结构。|1679440|现在，在客户端(用javascript)做验证是个坏主意。用户可以禁用javascript，甚至可以直接访问url来绕过验证，这会使您受到攻击。|1679441|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

He's got to mean "don't use java scriptlets", which is the stuff between &lt;% %>.

The biggest reason has got to be maintainability and debugging; scriptlets make everything make both very difficult. 

On the other hand, if you implement taglibs, you can extract any logic to a real java class, which is easily debugged, and you will still be able to open things up in a visual xml/html editor, since taglibs are a valid xml structure.

Now, it is a bad idea to do validation on the client side (in javascript). Users can disable javascript or even access a url directly to get around validation, which opens you up to exploits.

Why is it not advisable to use JavaScript in JSP? One rationale that I can think of is turning off the feature in browser would stop the code from executing. Is there any other reason behind this?

Why is it not advisable to use JavaScript in JSP?

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为什么不建议在JSP中使用JavaScript？我能想到的一个理由是，关闭浏览器中的功能会阻止代码执行。这背后还有其他原因吗？

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