我不确定尝试在悬停时在图像上显示透明叠加层时做错了什么。最初，我尝试了一种 javascript 方法，但这不起作用，所以我想我会尝试一种更轻量级的 css 方法。
有谁明白为什么这不起作用？
.section2-box {
display: inline-block;
width: 50%;
height: 50%;
border-bottom: 4px solid #FFF;
border-right: 4px solid #FFF;
box-sizing: border-box;
position: relative;
}
.fadeHover {
transition: all .35s ease;
-webkit-transition: all .35s ease;
transition-delay: 0.10s;
-webkit-transition-delay: 0.10s;
height: 100%;
width: 100%;
top: 0;
left: 0;
right: 0;
}
.fadeHover:hover .overlay {
background-color: rgba(0, 0, 0, 0.6);
z-index: 1;
height: 100%;
width: 100%;
top: 0;
left: 0;
right: 0;
position: absolute;
cursor: pointer;
}
.fadeHover-title {
font-family: 'Raleway', sans-serif;
font-weight: 600;
font-size: 1.3rem;
color: #FFF;
display: none;
}
.fadeHover-title.activeHover {
opacity: 1;
}
.fadeHover-description {
font-size: 1.1rem;
color: #FFF;
font-family: 'Open Sans', sans-serif;
display: none;
}
.fadeHover-description.activeHover {
opacity: 1;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div class="section2-box fadehover" id="section2box3">
<img src="https://upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Ash_Tree_-_geograph.org.uk_-_590710.jpg/220px-Ash_Tree_-_geograph.org.uk_-_590710.jpg">
<div class="overlay">
<h2 class="fadeHover-title">Option 1</h2>
<h3 class="fadeHover-description">Description</h3>
</div>
</div>
关于评论中的问题：将元素的文本颜色从 0 alpha 的 rgba 更改为 1 alpha：
.section2-box {
display: inline-block;
width: 50%;
height: 50%;
border-bottom: 4px solid #FFF;
border-right: 4px solid #FFF;
box-sizing: border-box;
position: relative;
}
.fadeHover {
transition: all .35s ease;
-webkit-transition: all .35s ease;
transition-delay: 0.10s;
-webkit-transition-delay: 0.10s;
height: 100%;
width: 100%;
top: 0;
left: 0;
right: 0;
}
.fadeHover .overlay {
z-index: 1;
height: 100%;
width: 100%;
top: 0;
left: 0;
right: 0;
position: absolute;
cursor: pointer;
}
.fadeHover-title {
font-family: 'Raleway', sans-serif;
font-weight: 600;
font-size: 1.3rem;
color: rgba(255,255,255,0);
transition: color 0.5s;
}
.fadeHover:hover .fadeHover-title {
color: rgba(255,255,255,1);
}
.fadeHover-description {
font-size: 1.1rem;
color: rgba(255,0,0,0);
transition: color 0.5s;
}
.fadeHover:hover .fadeHover-description {
color: rgba(255,0,0,1);
}
<div class="section2-box fadeHover" id="section2box3">
<img src="https://upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Ash_Tree_-_geograph.org.uk_-_590710.jpg/220px-Ash_Tree_-_geograph.org.uk_-_590710.jpg">
<div class="overlay">
<h2 class="fadeHover-title">Option 1</h2>
<h3 class="fadeHover-description">Description</h3>
</div>
</div>
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