是否有任何理由在CSS中包含类或ID选择器的标记名称？ [英] Is there any reason for including the tag name with a class or ID selector in CSS?

问题描述

我想知道 div.class 和 .class 是否有CSS选择器的区别只有一个标签（DIV）具有该属性。同样的ID： div＃ID 和 #ID 。

I'm wondering if there is any difference between div.class and .class as CSS selectors if there is only one tag (the DIV) with that attribute. Same thing for IDs: div#ID and #ID.

任何想法什么，如果有什么，是区别？对我来说，我在这些情况下使用类或ID;

Any idea what, if anything, is the difference? For me, I use the class or ID in these situations; but only because it's quicker to type.

推荐答案

1. 它们更具体，如果他们冲突，更短的版本。 div.foo 的特异性为11，而 .foo 的特异性为10.


2. 因为它们更具体，你知道该类应用于哪个nodename，而不是作为所有节点名称的通用规则，如果你有一个巨大的应用程序，吨的元素都具有相同的类名称，它可以减少您在源/文本编辑器中查找元素的时间。

1. They are more specific, so long ones will override the shorter version if they conflict. div.foo will have a specificity of 11 while .foo has a specificity of 10.
2. Since they are more specific, you know exactly which nodename the class applies to instead of being a universal rule for all node names, this can help if you have a huge application with tons of elements that all have the same class names, it can lessen the time for you to find the element in the source/text editor.

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