blocks|key|891095|text|既然您说您不关心彗星，这显然不是一件容易的事情，所以setInterval会做到这一点。不过，你想聪明点。你应该从30秒的间隔开始。如果用户开始聊天，您的时间间隔应该降到5。当您注意到越来越少的动作时，您的计时器应该再次下降到30秒，以此类推。它不会在可伸缩性会议上赢得任何奖项，但它会为你的中等规模网站赢得任何奖项。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|891096|有关此技术的更多信息，请参见看看这个相关的问题。|891097|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Comet_(programming))|1|https://stackoverflow.com/questions/676098/server-polling-intervals-for-a-javascript-chat-client^0|8|2|0|0|E|9|1|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]]|C|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]]]

Since you said you don't care for <a href="http://en.wikipedia.org/wiki/Comet_(programming)" rel="nofollow noreferrer">Comet</a>, which is admittedly not very easy to get going, setInterval will do the trick. You want to be smart about it, though. You should probably start with an interval of 30 seconds. If the user starts chatting, your interval should drop down to 5. As you notice less and less action, your timer should decay down to 30 seconds again, and so on. It's not going to win any awards at a scalability convention, but it will get it done for your average mid-size website. 

For more on this technique, <a href="https://stackoverflow.com/questions/676098/server-polling-intervals-for-a-javascript-chat-client">check out this related question</a>.

blocks|key|891108|text|利用绕轨道。乍一看，你的眼睛很容易发呆，开始抱怨太复杂了，但一旦你通过了它，你就会明白什么是“最佳实践”，以及为什么它既快速又可伸缩。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|891109|您还会发现自己意识到这是一种出色的技术，并且可以用于许多动态网页行为。|891110|entityMap|0|LINK|mutability|MUTABLE|url|http://www.orbited.org/^0|2|3|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

Take advantage of <a href="http://www.orbited.org/" rel="nofollow noreferrer">Orbited</a>. At first glance it's easy for your eyes to glaze over, start mumbling about being too complicated, but once you get passed it you'll understand what the "best practice" is, and why it is both fast and scalable.

You'll also find yourself realizing that this is an outstanding technique, and can be used for lots of dynamic web page behavior.

blocks|key|890923|text|另一个让你半途而废的选择是WebSync点播+(或者任何其他托管的彗星service...not，如果还有其他的)。它将允许您实现服务器推送功能，但是工作起来非常简单，因为您只需要包括javascript客户端。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|890924|entityMap|0|LINK|mutability|MUTABLE|url|http://www.frozenmountain.com/websync^0|D|9|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

One other option that kinda meets you halfway is <a href="http://www.frozenmountain.com/websync" rel="nofollow noreferrer">WebSync On-Demand</a> (or any other hosted comet service...not sure if there are others). It'll let you implement the server-push capabilities, but is nice and simple to get working, since all you need to do is include the javascript client.

I'm attempting to make a very simple 2-person chatroom for my Django site. I'm learning AJAX to do this. I need parts of the web page to update without user interaction:

<ul>
<li>When User 1 sends a message, it should appear on User 2's screen</li>
<li>When User 1 logs off, his status should change to "offline" on User 2's screen</li>
</ul>

What is the simplest way to implement this? Is it just to use JavaScript to poll the server at regular intervals? If so, what is the best practice for doing this? I found a few solutions about using setInterval or setTimeout, but wasn't sure if this was the best way.

(I've read about reverse AJAX, but from what I've read this is more complex to implement. I don't need my solution to be fast or scalable; I just need it to work.)

What is the simplest way to implement "server push"-like behavior for a web page?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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问为网页实现“服务器推送”-like行为的最简单方法是什么？EN