1. Features of jQuery jQuery eliminates browser compatibility issues Traversing the DOM tree and selecting elements A large plugin library A utility function library, such as $.type(), $.extent(), and so on The core function of jQuery usually refers to a factory object, that is, the jQuery() function, or its more commonly used alias, the $() function.

English title: Professional jQuery Author: [US] Otero, [US] Lawrence Publisher: Tsinghua University Press Translator: Shi Hongbin Publication year: 2013-04 ISBN: 9787302317845

English title: Professional JavaScript for Web Author: [US] Nicholas C. Zakas Publisher: Turing Programming Series Publication year: 2012-3-29 ISBN: 9787115275790

1. Event Handling Models: Bubbling and Capturing 1 2 3 <div id="outer"> <p id="inner">Click!</p> </div> In the code above, a div element contains a p child element. If both elements have a click handler, how do we know which one will be triggered first? To solve this problem, Microsoft and Netscape proposed two almost completely opposite concepts.