我有一种情况需要随意更新网页上的显示。我想这样做是AJAX，但我不知道如何做到这一点除了做

I have a situation where a display on a webpage needs to be updated at random. I am wanting to do this in AJAX but am not sure how to do this other than to do a

while(true) { ajaxFunction(); sleep(1) }

类型的事情。

Type thing.

这里的问题是，网页需要被更新很快就更改了服务器，但这些更改可能发生非常零星，有时从来没有。

The problem with this is that the webpage needs to be updated very quickly on a change to the server, but the changes could happen very sporadically sometimes never.

编辑：这是用一个UIWebView的iPhone应用程序，是有可能使用iPhone的推送通知使用JavaScript接口

This is an Iphone application using a UIWebView, is it possible to use the iPhone's push notification to interface with the javascript?

谢谢！

推荐答案

我觉得你描述什么是的彗星并有一对夫妇插件jQuery的：

I think what you're describing is Comet and there are a couple of plugins for jQuery:

HTTP：//$c$c.google.com/p/jquerycomet/

http://plugins.jquery.com/project/Comet