选择器 优先级 实例
ID选择器 100
类选择器 10
伪类选择器 10 :link :visited :focus :hover :actived :lang
UI元素状态伪类 E:enabled{}匹配所有用户界面(form表单)中处于可用状态的E元素
E:disabled{}匹配所有用户界面(form表单)中处于不可用状态的E元素
E:checked{}匹配所有用户界面(form表单)中处于选中状态的E元素
结构性伪类 E:first-child{}匹配父元素中第一个E元素
E:last-child{}匹配父元素中最后一个E元素
E:nth-child(n){}匹配第n个子元素E
E:nth-last-child(n){}匹配倒数第n个结构子元素E
E:nth-of-type(n){}匹配同类型中的第n个同级兄弟元素E
E:nth-last-of-type(n){}匹配同类型中的倒数第n个同级兄弟元素E
E:first-of-type{}匹配同级兄弟元素中的第一个E元素
E:only-child{}匹配属于父元素中唯一子元素的E
E:only-of-type{}匹配属于同类型中唯一兄弟元素的E
E:root{} 不常用 匹配文档的根元素。在HTML中,根元素永远是HTML
E:empty{} 不常用 匹配没有任何子元素(包括text节点)的元素E
否定伪类 p:not(s){}匹配所有不匹配简单选择符s的元素p
目标伪类 不常用
属性选择器 10
简单属性选择器 h1[foo]{color:red;}
具体属性值选择器 h1[foo="sun"]{color:red;} 选择foo属性值是sun的所有h1元素
子串匹配属性选择器 h1[foo*="sun"]{color:red;} 选择foo属性值中包含sun的所有h1元素
h1[foo^="sun"]{color:red;} 选择foo属性值以sun开头的所有h1元素
h1[foo$="sun"]{color:red;} 选择foo属性值以sun结尾的所有h1元素
元素选择器 1
子元素选择器 h1 > span{color:red;}
相邻兄弟元素选择器 h1 + h1{font-size:20px;}
伪元素选择器 1 p::first-letter{}设置段落p的首字母样式
p::first-line{} 设置段落p的首行样式
p::before{} p::after{}
p::selection{}设置被用户选取部分的样式

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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