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zdg收录，使用标签：facebook, IM, SNS，时间：2008-4-21 18:55:20 | 相关网摘，我也收藏
SNS和IM的结合是毫无疑问的，而随着web技术的发展，web based的IM会变得越来越有价值和可用，IM client的未来也许只是一个tray icon notifier而已了，而未来的OS很可能会把tray icon, gadget等设计成可以直接从web上装载并驻留的标准小程序 (IE 8的web slice就是这一趋势的体现) . 我想起很久前提起的IM (client) doesn’t matter,实在还是过分超前了些,不过很欣慰地看到这些趋势正在一个个地成为现实.
从facebook推出这个web chat的过程还是可以学习到一些东西的.其实在今天来说web chat/IM已经是一个成熟的技术了,但facebook在推出这个功能还是可以用谨小慎微来形容, 目前看到的这个功能也显得相当朴素和基本.但我相信 facebook在后台所策划的绝不仅仅如此,长远计划,分阶段实施,这才是踏踏实实切实可行的成功之道.
http://robertmao.com/archives/662
zdg收录，使用标签：Comet, google, IM，时间：2006-11-4 23:54:54 | 相关网摘，我也收藏
While the XMLHTTPRequest object works perfectly to request data from the server, being notified by the server requires the client to open a connection with the server, keep it open indefinitely, and have the server send notification to the client over this connection. As the XMLHTTPRequest object cannot be used for this purpose, people have been using an invisible iframe to establish the connection with the server. The idea is that the iframe loads an “infinitely long” page which contains JavaScript. The page is “rendered” as data is received by the browser, so when the server wants to send a notification to the client, it sends some JavaScript over that connection, and the JavaScript is instantly executed by the browser.
http://www.orbeon.com/blog/2006/03/01/kudos-to-google-for-the-google-talk-integration-in-gmail/
zdg收录，使用标签：ajax, IM，时间：2005-9-6 18:50:41 | 相关网摘，我也收藏
ajax im ("asynchronous javascript and xml instant messenger") is a browser-based instant messaging client. It uses the XMLHTTPRequest object in JavaScript to send and receive commands to and from the server. No refreshing of the page is ever needed for this "web application" to work, as everything is updated in real-time via JavaScript.
http://www.unwieldy.net/ajaxim/
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