Connection Manager Of YUI
前些天试用了Yahoo! UI Library的Connection Manager工具，略有些心得，这里丢块板砖出来，能不能引到玉，那是后话。
Connection Manager能干什么
The Connection Manager is a utility that enables you to make in-page HTTP requests through a simplified interface to the XMLHttpRequest object. The Connection Manager handles cross-browser instantiation of XMLHttpRequest, negotiates the server response and uses a callback pattern to process the response data.