Javascript查找伪元素 [英] Javascript find pseudo elements

问题描述

所以我一直在一个CSS选择器引擎上工作，我想支持伪元素（:: before，:: after，:: selection，:: first-line等）。我注意到Slick，Sizzle和一些其他流行的引擎似乎支持他们，但是当看看他们的代码，我发现没有代码（现在授予，我没有看起来那么难）。

So I've been work on a CSS selector engine, and I want to support pseudo-elements (::before, ::after, ::selection, ::first-line, etc). I noticed Slick, Sizzle, and some other popular engines seem to support them, but when looking through their code I found no code for it (now granted, I didn't look that hard). Does anyone know how they do it or some way I could do it?

推荐答案

这里有一个简单的方法来找到他们在Webkit使用jQuery，可以很容易地转换为标准的JS：

Here's a simple way to find them in Webkit using jQuery, can fairly easily be converted to standard JS:

$('*').filter(function(){return getComputedStyle(this, ':before').length != 0});

对于基于Gecko的浏览器，你需要一些不同的东西希望这有助于

For Gecko based browsers you need something a little different (haven't tested in IE). Hope this helps

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