node.js - iframe 中的 comet 服务器数据只是累积吗？

Question

我使用分块数据将 [script]dosomething()[/script] 标签推送到我的 comet 服务器的 iframe 中，但脚本标签只是继续永远累积。如何在每个脚本标记后删除它？

Answer 1

删除脚本标签

P.S:当你想删除脚本标签时，可能会遵循 Does comet server data in the iframe just accumulate?

我相信你应该close the connection after sometime (不好，请参阅 Does comet server data in the iframe just accumulate? )它会自动释放与该请求关联的内存。然后您当然需要重新连接。 This page甚至还说了些什么:

"Page Streaming" means the browser discovers server changes almost immediately. This opens up the possibility of real-time updates in the browser, and allows for bi-directional information flow. However, it's quite a departure from standard HTTP usage, which leads to several problems. First, there are unfortunate memory implications, because the Javascript keep accumulating, and the browser must retain all of that in its page model. In a rich application with lots of updates, that model is going to grow quickly, and at some point a page refresh will be necessary in order to avoid hard drive swapping, or a worse fate.

这建议重新加载页面，这也是一个选项。但我认为关闭该连接(iframe)并重新连接也可能有效。

Comet 有很多问题需要解决:

• 正如您可以从 this WIKI page 中读到的那样它还存在“可靠的错误处理方法，以及无法跟踪请求调用过程的状态”的问题。
• 此外，Internet Explorer 还需要发送一些垃圾才能启动该进程(请参阅 http://cometdaily.com/2007/11/05/the-forever-frame-technique/ )

这就是为什么我再次建议您使用 socket.io(见下文)，它可以解决所有这些废话。

Socket.io

我建议您使用socket.io相反，这是非常好的产品。是supported by all major browsers 。正如您所看到的，它支持多种传输(XHR、Websockets 等)，并选择浏览器上可用的最佳传输以获得最佳性能。