html - 悬停时的字幕叠加

Question

我正在尝试实现一个简单的标题，该标题在悬停时显示在我的缩略图上。目的是让图片单独显示，然后在悬停时，图片淡出一点，标题淡入上方。

我遇到的问题是悬停效果很好，直到鼠标越过标题本身，然后将图像返回到 100% 不透明度

<a href="#" class="thumbnail">

  <img src="img/placeholder1.jpg" alt="...">
  <span>caption</span>
</a>

CSS

a.thumbnail {
border:none;
border-radius: none;
padding:0;
margin:0;
position: relative;
background: #222;
}

a.thumbnail img {
-webkit-transition: opacity 0.5s ease;
-moz-transition: opacity 0.5s ease;
-o-transition: opacity 0.5s ease;
transition: opacity 0.5s ease;
opacity: 1; 
}


a.thumbnail img:hover {

opacity: 0.7;
}


a.thumbnail span {
color: #FFF;
position: absolute;
bottom: 40%;
width: 100%;
height: 20%;
padding: 10px;
opacity: 0; 
-webkit-transition: opacity 0.5s ease;
-moz-transition: opacity 0.5s ease;
-o-transition: opacity 0.5s ease;
transition: opacity 0.5s ease;
}

a.thumbnail:hover span {
opacity: 1; 
}

Answer 1

将图像悬停到父 div。这样，当鼠标悬停在标题上时，不透明度将保持不变，因为您仍将鼠标悬停在父级上。

   a.thumbnail:hover img {
      opacity: 0.7;
    }

* {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}
a.thumbnail {
  border: none;
  border-radius: none;
  padding: 0;
  margin: 0;
  position: relative;
  background: #222;
}
a.thumbnail img {
  -webkit-transition: opacity 0.5s ease;
  -moz-transition: opacity 0.5s ease;
  -o-transition: opacity 0.5s ease;
  transition: opacity 0.5s ease;
  opacity: 1;
}
a.thumbnail:hover img {
  opacity: 0.7;
}
a.thumbnail span {
  color: #FFF;
  position: absolute;
  bottom: 40%;
  left: 0;
  width: 100%;
  padding: 10px;
  background: red;
  opacity: 0;
  -webkit-transition: opacity 0.5s ease;
  -moz-transition: opacity 0.5s ease;
  -o-transition: opacity 0.5s ease;
  transition: opacity 0.5s ease;
}
a.thumbnail:hover span {
  opacity: 1;
}

<a href="#" class="thumbnail">

  <img src="http://lorempixel.com/output/city-q-c-200-200-4.jpg" alt="..." />
  <span>caption</span>
</a>