12.2. jQuery Overview
jQuery is a lightweight (18KB at time of writing) JavaScript library that was first released in 2006 by John Resig. jQuery provides the following:
Numerous ways to select, traverse, and manipulate elements on the page
"Chainability" of functions, which allows the results of one function to be fed into another
Functionality to separate code from design
Utilities for performing common tasks such as Ajax calls and browser capability checks
Special effects, such as fades and glides, and easy manipulation of CSS
Easy-to-extend plug-ins
Figure 12-1 shows a high-level view of the jQuery architecture. Antonio Lupetti has produced a much more detailed diagram that I would encourage you to take a look at here: wwww.box.net/shared/as4xkezd6a ...
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