How does jQuery find the index of an element in an unordered set

This article will explain in detail how jQuery looks up an element's index in a disordered set. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

Find the index of an element in an unordered set

$("ul > li") .click (function () {var index = $(this). PrevAll () .length;}) Jquery is what jquery is a simple and fast JavaScript library, it has a unique chain syntax and short and clear multi-function interface, efficient and flexible css selector, and can be extended to CSS selector, with convenient plug-in extension mechanism and rich plug-ins, after Prototype is another excellent JavaScript code base, can be used to simplify event processing, HTML document traversal, Ajax interaction and animation, in order to quickly develop the website.

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