css – 有没有办法将鼠标悬停在一个元素上并影响不同的元素?

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参见英文答案 > How to affect other elements when a div is hovered5个答案我想要这样简单,但我知道它不是:
img {
  opacity: 0.4;
  filter: alpha(opacity=40);
}

img:hover {
  #thisElement {
    opacity: 0.3;
    filter: alpha(opacity=30);
  }
  opacity:1;
  filter:alpha(opacity=100);
}

因此,当您将鼠标悬停在img上时,它会将#thisElement的不透明度更改为30%,并将图像的不透明度更改为100%。有没有办法实际这样做只使用css?

因此这是HTML

<!DOCTYPE html>
<html>
<head>
<script type="text/javascript" src="C:\Users\Shikamaru\Documents\Contwined Coding\LearningToCode\Learning jQuery\js\jquery-1.6.2.min.js"></script> 
<script type="text/javascript" src="briefcase.js"></script>
<link rel="stylesheet" type="text/css" href="taskbar.css"/>
<link rel="stylesheet" type="text/css" href="briefcase.css" /> 
<title>Briefcase</title> 
<Meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> 
</head> 

<body> 

<div class="mask"></div>
<div class="float">
  <div id="album1">Album Title</div>
  <img class="left" src="bradBeachHeart.JPG" alt="Brad at the Lake" />

  <img class="left" src="mariaNavi.jpg" alt="Making Maria Na'vi" />

  <img class="left" src="mattWaterRun.jpg" alt="Photoshopped Matt" />
</div>

<div class="gradientTop"></div>
<div class="gradientBottom"></div>


</body> 
</html>

这是CSS:

body {
  font: normal small/3em helvetica,sans-serif;
  text-align: left;
  letter-spacing: 2px;
  font-size: 16px;
  margin: 0;
  padding: 0;
}

div.gradientTop {
  position: absolute;
  margin-top: 5px;
  z-index: 2;
  width: 206px;
  height: 30px;
  float: left;
  background: -webkit-linear-gradient(rgba(255,255,2),rgba(255,0))
}

div.gradientBottom {
  position: absolute;
  margin-bottom: 5px;
  z-index: 2;
  width: 206px;
  height: 120px;
  float: left;
  bottom: -210px;
  background: -webkit-linear-gradient(rgba(255,0),1))
}

div.float {
  border-right: 1px solid orange;
  position: absolute;
  z-index: 2;
  margin-left: 5px;
  margin-top: 5px;
  float: left;
  width: 200px;
}

div.mask {
  position: relative;
  z-index: 1;
  margin-top: 5px;
  float: left;
  width: 206px;
  height: 805px;
  background-color: white;
}

img.left {
  z-index: inherit;
  margin-bottom: 3px;
  float: left;
  width: 200px;
  min-height: 200px;
  /* for modern browsers */
  height: auto !important;
  /* for modern browsers */
  height: 200px;
  /* for IE5.x and IE6 */
  opacity: 0.4;
  filter: alpha(opacity=40)
}

img.left:hover + #album1 {
  opacity: .4;
}

img.left:hover {
  opacity: 1.0;
}

#album1 {
  z-index: 2;
  width: 200px;
  color: white;
  text-align: center;
  position: absolute;
  background: orange;
  top: 70px;
}

解决方法

使用CSS的唯一方法是如果要影响的元素是后代或相邻的兄弟。

在后代的情况下:

#parent_element:hover #child_element,/* or */
#parent_element:hover > #child_element {
    opacity: 0.3;
}

这将适用于以下元素:

<div id="parent_element">
    <div id="child_element">Content</div>
</div>

对于相邻兄弟姐妹:

#first_sibling:hover + #second_sibling {
    opacity: 0.3;
}

它适用于标记,如:

<div id="first_sibling">Some content in the first sibling</div> <div id="second_sibling">and now in the second</div>

在这两种情况下,选择器中的后一个元素是所选择的元素。

给定你的伪代码示例,你可能想要像:

img:hover + img {
    opacity: 0.3;
    color: red;
}

JS Fiddle demo

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