CSS：悬停后转换 [英] CSS :after hover Transition

问题描述

HTML结构

<div id="small_gal">
    <div><img src="images1.jpg" /></div>
    <div><img src="images1.jpg" /></div>
    <div><img src="images1.jpg" /></div>
    <div><img src="images1.jpg" /></div>
    <div><img src="images1.jpg" /></div>
    <div><img src="images1.jpg" /></div>
    <div><img src="images1.jpg" /></div>
    <div><img src="images1.jpg" /></div>
</div>

图片有阴影效果，因此 border 不是解决方案，因为它会在图像之外

The images are having dropshadows so border is not a solution, as it will be outside the image

这是我使用的代码

#small_gal div:hover{cursor: pointer;}
#small_gal div:after {
    content: '';
    position: absolute;
    width: 112px;
    height: 81px;
    border: 3px solid #e27501;
    left: 9px; top: 9px;
    z-index: 9;

    opacity: 0;
    -webkit-transition: opacity 0.5s ease-in-out;
    -moz-transition: opacity 0.5s ease-in-out;
    -o-transition: opacity 0.5s ease-in-out;
    -ms-transition: opacity 0.5s ease-in-out;
    transition: opacity 0.5s ease-in-out;
}
#small_gal div:hover:after {
    opacity: 1;
}

注意：

#small_gal

容器
每个图像包装在一个div中，因此我们可以实现：

is only the container each image is wrapped in a div so we can implement :after

推荐答案

Firefox 4+浏览器支持伪元素的转换，例如：之前和：之后。

Firefox 4+ is the only browser that supports the transitioning of pseudo-elements such as :before and :after.

资料来源： http：// css-tricks .com / 13555-transitions-and-animations-on-css-generated-content /

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