问题很简单.是否有任何“正确”的方式来订购jQuery / CSS选择器的部分？例如,假设我有一个具有以下属性的元素：
<div class="red green blue" id="someDiv" anAttr="something">
为了更好地衡量,我们也会在它被徘徊时瞄准它.
以下选择器之间有什么区别吗？：
div.red.green.blue#someDiv[anAttr='something']:hover div#someDiv.red.green.blue[anAttr='something']:hover div.red#someDiv[anAttr='something']:hover.blue.green div[anAttr='something'].blue:hover#someDiv.red.green
意思是,目标的顺序是否重要,真的吗？或者我可以把它们放在任何 – 我想要的顺序？
根据这个JSFiddle,他们都在技术上工作.
解决方法
5.2 Selector Syntax
A simple selector is either a type selector or universal selector
followed immediately by zero or more attribute selectors,ID
selectors,or pseudo-classes,in any order. The simple selector
matches if all of its components match.Note: the terminology used here in CSS 2.1 is different from what is
used in CSS3. For example,a “simple selector” refers to a smaller
part of a selector in CSS3 than in CSS 2.1. See the CSS3 Selectors
module [CSS3SEL].A selector is a chain of one or more simple selectors separated by
combinators. Combinators are: white space,“>”,and “+”. White space
may appear between a combinator and the simple selectors around it.The elements of the document tree that match a selector are called
subjects of the selector. A selector consisting of a single simple
selector matches any element satisfying its requirements. Prepending a
simple selector and combinator to a chain imposes additional matching
constraints,so the subjects of a selector are always a subset of the
elements matching the last simple selector.One pseudo-element may be appended to the last simple selector in a
chain,in which case the style information applies to a subpart of
each subject.
来自：w3.org
原文地址：https://www.jb51.cc/jquery/177164.html
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