先贴代码:
css部分:
@-webkit-keyframes fadeIn {
0% {
opacity: 0.2;width:100%; /*初始状态 透明度为0.2大小为100%*/
}
10%{
opacity: 0.3;width:105%; /*补间动画10% 透明度0.3 大小105%*/
}
20%{
opacity: 0.4;width:110%;
}
30% {
opacity: 0.5;width:115%;
}
40%{
opacity: 0.6;width:125%;
}
50%{
opacity: 0.7;width:130%;
}
60%{
opacity: 0.8;width:135%;
}
70%{
opacity: 0.7;width:140%;
}
80%{
opacity: 0.6;width:145%;
}
90%{
opacity: 0.4;width:150%;
}
100% {
opacity: 0.3;width:155%; /*结尾状态 透明度为0.3,大小放大为155%*/
}
}
.sae{
-webkit-animation-name: fadeIn; /*动画名称*/
-webkit-animation-duration: 2s; /*动画持续时间*/
-webkit-animation-iteration-count: infinite; /*动画次数*/
-webkit-animation-delay: 0s; /*延迟时间*/
}
.sae1{
-webkit-animation-name: fadeIn; /*动画名称*/
-webkit-animation-duration: 2s; /*动画持续时间*/
-webkit-animation-iteration-count: infinite; /*动画次数*/
-webkit-animation-delay: 3s; /*延迟时间*/
}
.sae2{
-webkit-animation-name: fadeIn; /*动画名称*/
-webkit-animation-duration: 2s; /*动画持续时间*/
-webkit-animation-iteration-count: infinite; /*动画次数*/
-webkit-animation-delay: 5s; /*延迟时间*/
}
.sae3{
-webkit-animation-name: fadeIn; /*动画名称*/
-webkit-animation-duration: 2s; /*动画持续时间*/
-webkit-animation-iteration-count: infinite; /*动画次数*/
-webkit-animation-delay: 2s; /*延迟时间*/
}
html部分:





效果:
用PC截图 看起来云被放的太大 不明显 手机端更清晰
解释下:
首先是css部分
@-webkit-keyframes fadeIn 这部分为CSS动画
通过百分比控制 补间动画
我这做的是一个云从后面飘上来的一个效果。
所以我的补间动画
云从 透明 小 --》明显 大 --》透明 更大
如果觉得画面漂浮动画卡顿,可以创建更多补间时间,以及调整动画时长来让它更流畅。
.sae{
-webkit-animation-name: fadeIn; /*动画名称*/
-webkit-animation-duration: 2s; /*动画持续时间*/
-webkit-animation-iteration-count: infinite; /*动画次数:无限循环*/
-webkit-animation-delay: 0s; /*延迟时间*/
}
引用动画,并设置动画参数。
因为有多朵云,所以要设置不同的参数,这样云才能有快有慢,
延迟让云朵出现错开
html 部分即使 设置云的位置已经 云图片
因为我们要有云不停飘动的效果,所以添加了多张云图,同时位置错开。
下面附上一张云朵的png图
云在上面哟。右击保存

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