无法理解CSS选择器在juizy幻灯片样式表中的含义
问题描述：
我试图将juizy slideshow添加到我的网站页面，但我需要完全理解它是如何制作的，以便将其动画（滑动）与我自己的习惯动画我想要添加到页面以及。无法理解CSS选择器在juizy幻灯片样式表中的含义
除了第一个链接中的简要技术说明外，还有更多详细信息（但法语和* 1的可下载代码与讨论的代码略有不同，因为作者对可下载版本做了一些改进） 。
<body>
<span id="sl_play" class="sl_command"> </span>
<span id="sl_pause" class="sl_command"> </span>
<span id="sl_i1" class="sl_command sl_i"> </span>
<span id="sl_i2" class="sl_command sl_i"> </span>
<span id="sl_i3" class="sl_command sl_i"> </span>
<span id="sl_i4" class="sl_command sl_i"> </span>
<section id="slideshow">
<a class="commands prev commands1" href="#sl_i4" title="Go to last slide"><</a>
<a class="commands next commands1" href="#sl_i2" title="Go to 2nd slide">></a>
<a class="commands prev commands2" href="#sl_i1" title="Go to 1rst slide"><</a>
<a class="commands next commands2" href="#sl_i3" title="Go to 3rd slide">></a>
<a class="commands prev commands3" href="#sl_i2" title="Go to 2nd slide"><</a>
<a class="commands next commands3" href="#sl_i4" title="Go to 4th slide">></a>
<a class="commands prev commands4" href="#sl_i3" title="Go to 3rd slide"><</a>
<a class="commands next commands4" href="#sl_i1" title="Go to first slide">></a>
<a class="play_commands pause" href="#sl_pause" title="Maintain paused">Pause</a>
<a class="play_commands play" href="#sl_play" title="Play the animation">Play</a>
<div class="container">
<div class="c_slider"></div>
<div class="slider">
<figure>
<img src="img/dummy-640x310-1.jpg" alt="" width="640" height="310" />
<figcaption>The mirror of soul</figcaption>
</figure><!--
--><figure>
<img src="img/dummy-640x310-2.jpg" alt="" width="640" height="310" />
<figcaption>Let's cross that bridge when we come to it</figcaption>
</figure><!--
--><figure>
<img src="img/dummy-640x310-3.jpg" alt="" width="640" height="310" />
<figcaption>Sushi<em>(do)</em> time</figcaption>
</figure><!--
--><figure>
<img src="img/dummy-640x310-4.jpg" alt="" width="640" height="310" />
<figcaption>Waking Life</figcaption>
</figure>
</div>
</div>
<span id="timeline"></span>
<ul class="dots_commands"><!--
--><li><a title="Show slide 1" href="#sl_i1">Slide 1</a></li><!--
--><li><a title="Show slide 2" href="#sl_i2">Slide 2</a></li><!--
--><li><a title="Show slide 3" href="#sl_i3">Slide 3</a></li><!--
--><li><a title="Show slide 4" href="#sl_i4">Slide 4</a></li>
</ul>
</section>
</body>
这是它的样式代码：
#slideshow {
position: relative;
width: 640px;
height: 310px;
padding: 15px;
border: 1px solid #ddd;
margin: 0 auto 2em;
background: #FFF;
background: -webkit-linear-gradient(#FFF, #FFF 20%, #EEE 80%, #DDD);
background: -moz-linear-gradient(#FFF, #FFF 20%, #EEE 80%, #DDD);
background: -ms-linear-gradient(#FFF, #FFF 20%, #EEE 80%, #DDD);
background: -o-linear-gradient(#FFF, #FFF 20%, #EEE 80%, #DDD);
background: linear-gradient(#FFF, #FFF 20%, #EEE 80%, #DDD);
-webkit-border-radius: 2px 2px 2px 2px;
-moz-border-radius: 2px 2px 2px 2px;
border-radius: 2px 2px 2px 2px;
-webkit-box-shadow: 0 0 3px rgba(0,0,0, 0.2);
-moz-box-shadow: 0 0 3px rgba(0,0,0, 0.2);
box-shadow: 0 0 3px rgba(0,0,0, 0.2);
}
/* Here are some other rules for the #timeline and .dots_commands that i removed to make shorter this code */
/* play/pause commands */
.play_commands {
position: absolute;
width: 22px; height: 22px;
top: 25px; right: 25px;
z-index: 10;
text-indent: -9999px;
border:0 none;
opacity: 0;
-webkit-transition: opacity 1s, right 1s;
-moz-transition: opacity 1s, right 1s;
transition: opacity 1s, right 1s;
}
.play { right: 55px; cursor: default; }
.pause:hover { border:0 none; }
.play_commands:focus { outline:0; }
#slideshow:hover .pause,
#sl_play:target ~ #slideshow:hover .pause,
.play_commands:focus {
opacity: 1;
}
.sl_command:target ~ #slideshow:hover .pause,
#sl_pause:target ~ #slideshow:hover .pause {
opacity: 0;
}
.pause:after,
.pause:before {
position: absolute;
display: block;
content: " ";
top:0;
width:38%;
height: 22px;
background: #fff;
background: rgba(255,255,255,0.5);
}
.pause:after {
right:0;
}
.pause:before {
left:0;
}
.play {
width: 1px;
height: 1px;
border-top: 10px solid transparent;
border-left: 20px solid #fff;
border-left: 20px solid rgba(255,255,255,0.5);
border-bottom: 10px solid transparent;
opacity: 0;
}
.play:hover,
.play:focus {
border-bottom: 10px solid transparent;
}
#slideshow .container {
position:relative;
width: 640px;
height: 310px;
overflow: hidden;
}
/* timeline base */
#slideshow .container:after {
position:absolute;
bottom: 0; left:0;
content: " ";
background: #999;
width: 100%;
height: 1px;
}
@-webkit-keyframes slider {
0%, 20%, 100% { left: 0 }
25%, 45% { left: -100% }
50%, 70% { left: -200% }
75%, 95% { left: -300% }
}
@-moz-keyframes slider {
0%, 20%, 100% { left: 0 }
25%, 45% { left: -100% }
50%, 70% { left: -200% }
75%, 95% { left: -300% }
}
@keyframes slider {
0%, 20%, 100% { left: 0 }
25%, 45% { left: -100% }
50%, 70% { left: -200% }
75%, 95% { left: -300% }
}
#slideshow .slider {
position: absolute;
left:0; top:0;
width: 400%;
height: 310px;
-webkit-animation: slider 32s infinite;
-moz-animation: slider 32s infinite;
animation: slider 32s infinite;
}
.sl_i:target ~ #slideshow .slider {
-webkit-transition: left 1s;
-moz-transition: left 1s;
transition: left 1s;
}
.sl_command:target ~ #slideshow .slider {
-webkit-transition: opacity 1s;
-moz-transition: opacity 1s;
transition: opacity 1s;
}
#slideshow .c_slider {
position: absolute;
left:0; top:0;
width: 400%;
height: 310px;
background: url(img/dummy-640x310-1.jpg) 0 0 no-repeat, url(img/dummy-640x310-2.jpg) 640px 0 no-repeat, url(img/dummy-640x310-3.jpg) 1280px 0 no-repeat, url(img/dummy-640x310-4.jpg) 1920px 0 no-repeat;
}
.sl_i:target ~ #slideshow .c_slider {
-webkit-transition: background 1s;
-moz-transition: background 1s;
transition: background 1s;
}
/* need a stop ! */
/* actions when target ! */
.sl_command { display: none; }
.sl_command:target ~ #slideshow .slider,
.sl_command:target ~ #slideshow figure:after,
.sl_command:target ~ #slideshow figcaption,
.sl_command:target ~ #slideshow #timeline,
.sl_command:target ~ #slideshow .dots_commands li:first-child a:after {
-webkit-animation-play-state: paused;
-moz-animation-play-state: paused;
animation-play-state: paused;
}
#sl_play:target ~ #slideshow .slider,
#sl_play:target ~ #slideshow figure:after,
#sl_play:target ~ #slideshow figcaption,
#sl_play:target ~ #slideshow #timeline,
#sl_play:target ~ #slideshow .dots_commands li:first-child a:after {
-webkit-animation-play-state: running;
-moz-animation-play-state: running;
animation-play-state: running;
}
.sl_command:target ~ #slideshow .pause { opacity:0; }
.sl_command:target ~ #slideshow .play { opacity:1; right: 25px; cursor: pointer; }
#sl_play:target ~ #slideshow .pause { opacity:0; }
#sl_play:target ~ #slideshow .play { opacity:0; right: 55px; cursor: default;}
.sl_i:target ~ #slideshow .slider { visibility: hidden }
.sl_i:target ~ #slideshow .slider figcaption { visibility: hidden }
.sl_i:target ~ #slideshow .dots_commands li:first-child a:after { display:none; }
.sl_i:target ~ #slideshow .dots_commands li:first-child a:before { display:block; }}
#sl_i1:target ~ #slideshow .commands { display: none; }
#sl_i1:target ~ #slideshow .commands1 { display: block; }
#sl_i1:target ~ #slideshow .c_slider { background-position: 0 0, 640px 0, 1280px 0, 1920px 0; }
#sl_i1:target ~ #slideshow .dots_commands li:first-child a:before { left:0; }
#sl_i2:target ~ #slideshow .commands { display: none; }
#sl_i2:target ~ #slideshow .commands2 { display: block; }
#sl_i2:target ~ #slideshow .c_slider { background-position: -640px 0, 0 0, 640px 0, 1280px 0; }
#sl_i2:target ~ #slideshow .dots_commands li:first-child a:before { left:18px; }
#sl_i3:target ~ #slideshow .commands { display: none; }
#sl_i3:target ~ #slideshow .commands3 { display: block; }
#sl_i3:target ~ #slideshow .c_slider { background-position: -1280px 0, -640px 0, 0 0, 640px 0; }
#sl_i3:target ~ #slideshow .dots_commands li:first-child a:before { left:36px; }
#sl_i4:target ~ #slideshow .commands { display: none; }
#sl_i4:target ~ #slideshow .commands4 { display: block; }
#sl_i4:target ~ #slideshow .c_slider { background-position: -1920px 0, -1280px 0, -640px 0, 0 0; }
#sl_i4:target ~ #slideshow .dots_commands li:first-child a:before { left:54px; }
选择我无法从以前的样式表理解的组合，就在这条规则：
#slideshow:hover .pause,
#sl_play:target ~ #slideshow:hover .pause,
.play_commands:focus {
opacity: 1;
}
第一个组合
#slideshow:hover .pause是否转换为“选择所有类名暂停为de的元素元素的幻灯片ID的元素“？#sl_play:target ~ #slideshow:hover .pause表示什么？
------------------编辑后Brian Stephens answer --------------------- -
对于问题2）我仍然无法理解什么是悬停状态必须由具有:target伪类的ID前面的那个意思，一般在CSS的优先级为约元件配置在代码，但在这种情况下，它看起来像是关于事件而已：是否意味着必须首先激活指定#sl_play的超链接，然后在#slideshow上进行悬停规则可能有效？如果优先级是关于事件的，那么代码中的优先级就不再重要了？
答
问题1：请问第一组合#slideshow:hover .pause翻译成“选择与类名可以暂停该元素的后裔与幻灯片的ID的所有元素”？
答案：是的，它是一个后代选择器，它没有指定它必须是一个孩子;它可能会进一步下降。请记住，它也指定悬停状态。
问题＃2：#sl_play:target ~ #slideshow:hover .pause表示什么？
答案：这使用一个通用的兄弟连接器。 #slideshow:hover之前必须有#sl_play:target，但不一定立即。它必须是后来的兄弟姐妹。
这里有一个很好的文章，解释孩子的一切变化和同胞选择：CSS Tricks
对于问题2我仍然无法理解的是，一个悬停状态的必须由具有一个ID前面的含义：目标伪类，通常在CSS中，precedance是关于代码中的元素处置，但在这种情况下，它看起来像是关于事件：是否意味着必须首先激活针对#sl_play的超链接，然后悬停应该发生在该规则可能会失败的#slideshow？我不这么认为，但为什么不立即使用#sl_play：target？ – Bardelman
@Bardelman：他们是完全独立的。选择器简单地期望一个元素应该匹配'：target'，而另一个元素应该匹配'：hover'。如果这些元素中的任何一个与选择器给出的伪类不匹配，则选择器将不匹配。作为另一个例子，它就像'＃id.class1〜.pause' - 如果元素没有“class1”，那么选择器就不会匹配。 – BoltClock
@Bardelman：你为什么要同时使用？这完全取决于CSS如何工作。也许它只有在这两个条件中的每一个以特定顺序满足时才有效。 – BoltClock