How to understand the complete functional framework of ajax

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I remember an article about AJAX's "Seven deadly Sins" that AJAX cannot use link collections, that is, the browser's tagging function, let alone browser retreat. Then there is an article that translates a foreigner's AJAX component and implements the history and fallback functions, but the semantics are a little difficult to understand, so after analyzing that component, we find out the essence, then rewrite the AJAX RSS application, and give the method notes for the implementation of all functions.

At present, this application is not available under Firefox, but the problem should be solved soon.

Source code:

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Program code

AJAX Primary applications-RSS no refresh aggregator (RC 060221)

AJAX primary application-RSS no refresh aggregator