你可以通过配置CSS中链接的active伪类来添加一个按下的按钮状态。
You can add a pressed button state with CSS by styling the active pseudo-class of the link in question.
伪类的表示方法是在名称前面加一个冒号。伪类与特定元素无关，而是根据文档中发生的情况应用样式。
Designated by a colon preceding the name, pseudo-classes are independent of particular elements and instead look at what's happening within the document.
一个简单选择符或者是一个类型选择符，或者是一个全局选择符，紧跟在后的是零个或多个属性选择符，ID选择符或伪类，次序任意。
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.
样式规则包含冒号而不包含伪类。
使用伪类选择器来改变内容？
开头，冒号后面是伪类的名称和包含在圆括号中的可选参数。
A pseudo-class always consists of a "colon" (:) followed by the name of the pseudo-class and optionally by a value between parentheses.
并不是真正的编程语言,好比某种“伪英语“，或“类C语言“,你现在在语法中看到的就是所谓的伪代码，非常随意。
It's just some bogus language we made up that's kind of English-like, kind of look C-like now that you've seen this syntax, but it was just an arbitrary language.
构造一类具有伪随机序列性质的循环码，并利用良好的伪随机序列的相关特性，对循环码进行相关译码。
The cyclic code based on pseudorandom sequence, and its decoding can take advantage of the nice characteristic of pseudorandom sequence's correlation.
利用不动点理论，给出了一类半线性微分方程有界的调和伪概周期解存在的充分条件。
Using fixed point theorems, in this paper we give sufficient conditions of the existence of bounded mild pseudo almost periodic solution for some semilinear differential equations.
目的：寻找鹿线粒体DNA上区别于常见伪充鹿类药材来源动物的种属特异性片段。
OBJECTIVE: to find the species distinctive segment of mtDNA which can be used to distinguish the deer from those animals always used to make false medicine of deer.
基于交错方法构造出了一类新的伪随机序列，称为GMW相控序列。
Based on the interleave method, a new class of binary pseudorandom sequences is constructed, which is called GMW Phase Controlled sequence (or GMW PC sequence).
本文应用分子动力学模拟方法，研究了丁二酰亚胺类分散剂模型分子在伪烟炱表面的吸附行为。
Molecular Dynamics simulation was used in this paper to study the adsorption behaviors of various succinimide dispersants on pseudo-soot surface.
广义自缩序列是基于LFSR的一类非常规钟控的序列，具有良好的伪随机性，可以用作加密时的密钥流。
Generalized self -shrinking sequences is a class of sequence, which is based on LFSR, with irregularly clocked, and it has good pseudo-randomness.
归纳三类多传感器量测融合算法，即扩维滤波法、伪序贯滤波法和复合量测滤波法。
Currently there exist three multisensor measurement fusion methods, namely, augmented method, pseudo-sequential filtering method, and combined measurement filtering method.
为解决这个问题，提出了一类可以抑制探测器响应不一致性，从而能消除环状伪影的扫描采样方式；
In order to mitigate this situation, a class of scan sampling patterns was proposed, which could suppress the non_uniform response and consequently decrease the ring artifacts.
本文讨论了一类具有较强应用背景的二维半线性伪抛物方程，设计了求解此类方程对应的初边值问题的隐式差分格式。
A type of 2D semi-linear pseudo-parabolic equation is cousidered, which has wide application areas. An implicit difference scheme corresponding to the IBVP of this equation is designed.
文章讨论了一类二维伪抛物型湿气迁移模型。
In this paper, some two-dimensional moisture transferring model is considered.
在一定条件下，证明一类拟线性伪双曲方程的第一初边值问题古典解的存在性。
The present paper provides a class of quasilinear pseudohyperbolic equation of the existence of classical solutions of the first boundary value problem under some suitable structure conditions.
在第二章提出了一类新的广义自缩序列，研究表明该类序列具有较好的伪随机性质；
In chapter two, a new q-ary generalized self-shrinking sequence is introduced. The sequences generated have good pseudo-randomness.
在第二章提出了一类新的广义自缩序列，研究表明该类序列具有较好的伪随机性质；
In chapter two, a new q-ary generalized self-shrinking sequence is introduced. The sequences generated have good pseudo-randomness.
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