css - 在 CSS 中更改图像的不透明度
问题描述
如何将图像的不透明度从 0.5 设置为 1?我正在制作一个启动画面,我希望我的网站在图像的不透明度达到 1 时进行更改。这是我的代码:
.preload{
width: 100%;
height: 100%;
background: black;
position: fixed;
top: 0;
left: 0;
}
.logo {
display: block;
width: 500px;
height: 300px;
position: absolute;
top: 0; bottom: 0; left: 0; right: 0;
margin: auto;
opacity: 0.5;
}
<div class = "preload" id="preload">
<div class ="logo">
<img src = "https://www.gstatic.com/webp/gallery/5.sm.jpg" class = "logo">
</div>
</div>
解决方案
您可以使用 CSSanimation
属性。尝试这个:
.preload{
width: 100%;
height: 100%;
background: black;
position: fixed;
top: 0;
left: 0;
}
.logo {
display: block;
width: 500px;
height: 300px;
position: absolute;
top: 0; bottom: 0; left: 0; right: 0;
margin: auto;
animation: example 3s linear infinite;
}
@keyframes example {
0% {opacity: 0.0;}
25% {opacity: 0.25;}
50% {opacity: 0.50;}
75% {opacity: 0.75;}
100% {opacity: 1;}
}
<div class = "preload" id="preload">
<div class ="logo">
<img src = "https://www.gstatic.com/webp/gallery/5.sm.jpg" class = "logo">
</div>
</div>