


[attribute] 用于选取带有指定属性的元素。 [attribute=value] 用于选取带有指定属性和值的元素。 [attribute~=value] 用于选取属性值中包含指定词汇的元素。 [attribute|=value] 用于选取带有以指定值开头的属性值的元素,该值必须是整个单词。 [attribute^=value] 匹配属性值以指定值开头的每个元素。 [attribute$=value] 匹配属性值以指定值结尾的每个元素。 [attribute*=value] 匹配属性值中包含指定值的每个元素。
下面的例子为包含指定值的 title 属性的所有元素设置样式。适用于由空格分隔的属性值:[title~=hello] { color:red; }下面的例子为带有包含指定值的 lang 属性的所有元素设置样式。适用于由连字符分隔的属性值:[lang|=en] { color:red; }
~= where value must be one Independent words, such as [title~=test], test a can be selected, testa cannot be selected.
*=The value only needs to be a substring of the value. For example, test-a, test a and testa can all be selected.
|= has the same characteristics as ~=, ^= has the same characteristics as *=. Therefore, it is usually better to use ^= and *=.

The official account web page update cache, this thing is simple and simple, and it is complicated enough to drink a pot of it. You worked hard to update the official account article, but the user still opened the old version. Who can bear the taste? In this article, let’s take a look at the twists and turns behind this and how to solve this problem gracefully. After reading it, you can easily deal with various caching problems, allowing your users to always experience the freshest content. Let’s talk about the basics first. To put it bluntly, in order to improve access speed, the browser or server stores some static resources (such as pictures, CSS, JS) or page content. Next time you access it, you can directly retrieve it from the cache without having to download it again, and it is naturally fast. But this thing is also a double-edged sword. The new version is online,

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