我有三个基于页面上的路径点淡入的 div。我试图错开这些 div。我遇到的问题是因为我从不透明度淡出它们:0,一旦添加了“动画”类,所有 div 都会显示(然后延迟的 div 将从不透明度播放它们的动画:1)。这可能是一个愚蠢的问题,但我想不出一种方法来延迟第二个和第三个 div 的不透明度,而不必为它们提供单独的动画类。任何帮助将不胜感激!
.project {
opacity: 0;
}
.project.animated {
opacity: 1;
animation-name: fadeInDown;
animation-duration: 1s;
&:nth-child(2) {
animation-delay: .3s;
}
&:nth-child(3) {
animation-delay: .6s;
}
}
@keyframes fadeInDown {
from {
opacity: 0;
transform: translate3d(0, -40%, 0);
}
to {
opacity: 1;
transform: none;
}
}
编译后的 CSS:
.project {
opacity: 0;
}
.project.animated {
opacity: 1;
animation-name: fadeInDown;
animation-duration: 1s;
}
.project.animated:nth-child(2) {
animation-delay: .3s;
}
.project.animated:nth-child(3) {
animation-delay: .6s;
}
@keyframes fadeInDown {
from {
opacity: 0;
transform: translate3d(0, -40%, 0);
}
to {
opacity: 1;
transform: none;
}
}
最佳答案
选项 1:
从 .animated
类中删除 opacity: 1
并添加 animation-fill-mode: forwards
。此设置意味着动画元素将保持其最后一个关键帧(具有 opacity: 1
)的状态,因此不需要额外的属性设置。
window.onload = function() {
setTimeout(function() {
var els = document.querySelectorAll('.project');
for (var i = 0; i < els.length; i++) {
els[i].classList.add('animated');
}
}, 100);
}
.project {
opacity: 0;
}
.project.animated {
/*opacity: 1;*/
animation-name: fadeInDown;
animation-duration: 1s;
animation-fill-mode: forwards;
}
.project.animated:nth-child(2) {
animation-delay: .3s;
}
.project.animated:nth-child(3) {
animation-delay: .6s;
}
@keyframes fadeInDown {
from {
opacity: 0;
transform: translate3d(0, -40%, 0);
}
to {
opacity: 1;
transform: none;
}
}
/* just for demo */
.project {
height: 100px;
width: 100px;
background: red;
<div class='project'>First</div>
<div class='project'>Second</div>
<div class='project'>Third</div>
选项 2:
如果出于某种原因你不想从 .animated
类中删除 opacity: 1
然后设置 animation-fill-mode: backwards
到元素。这将使动画元素在 animation-delay
期间保持其第一个关键帧 (opacity: 0
) 中提到的状态,因此该元素不会立即显示。
window.onload = function() {
setTimeout(function() {
var els = document.querySelectorAll('.project');
for (var i = 0; i < els.length; i++) {
els[i].classList.add('animated');
}
}, 100);
}
.project {
opacity: 0;
}
.project.animated {
opacity: 1;
animation-name: fadeInDown;
animation-duration: 1s;
animation-fill-mode: backwards;
}
.project.animated:nth-child(2) {
animation-delay: .3s;
}
.project.animated:nth-child(3) {
animation-delay: .6s;
}
@keyframes fadeInDown {
from {
opacity: 0;
transform: translate3d(0, -40%, 0);
}
to {
opacity: 1;
transform: none;
}
}
/* just for demo */
.project {
height: 100px;
width: 100px;
background: red;
<div class='project'>First</div>
<div class='project'>Second</div>
<div class='project'>Third</div>
关于css - 从 0 不透明度交错淡入 div,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/37488440/