首先要知道什么是CSS3动画?然后才能做出自己想要的动画效果。下面会通过3个简单的Loading动画效果来对CSS3 animation动画做一个简单介绍,希望对你有用。
动画是使元素从一种样式逐渐变化为另一种样式的效果。
您可以改变任意多的样式任意多的次数。
使用百分比来规定变化发生的时间,或用关键词 "from" 和 "to",等同于 0% 和 100%。
0% 是动画的开始,100% 是动画的完成。
要创建CSS3动画,那么首先就要了解@keyframes规则。@keyframes规则是创建动画。 @keyframes规则内指定一个CSS样式和动画将逐步从目前的样式更改为新的样式。
当在 @keyframes 创建动画,把它绑定到一个选择器,否则动画不会有任何效果。
指定至少这两个CSS3的动画属性绑定向一个选择器:规定动画的名称;规定动画的时长。
Loading动画1:
<!-- html代码 总共8个点 -->
<div class="point-loading">
<span class="point"></span>
<span class="point"></span>
<span class="point"></span>
<span class="point"></span>
<span class="point"></span>
<span class="point"></span>
<span class="point"></span>
<span class="point"></span>
</div>
/*css样式代码*/
/*定义动画*/
@keyframes pointLoading {
0% {
transform: scale(1);
opacity: 1;
}
100% {
transform: scale(.3);
opacity: 0.5;
}
}
/*定义样式*/
.point-loading {
width: 100px;
height: 100px;
position: relative;
margin: 0 auto;
margin-top: 150px;
margin-bottom: 100px;
}
.point-loading .point {
width: 20px;
height: 20px;
border-radius: 50%;
background: lightgreen;
position: absolute;
animation-name:pointLoading; /*绑定动画*/
animation-duration:1s; /*绑定动画完成一个周期所用时间*/
animation-iteration-count:infinite; /*动画播放次数 默认是1,infinite无限次播放*/
}
/*nth-child:选择器匹配属于其父元素的第 N 个子元素;animation-delay:动画延迟播放*/
.point-loading .point:nth-child(1) {
left: 0;
top: 50%;
margin-top: -10px;
animation-delay: 0.13s;
}
.point-loading .point:nth-child(2) {
left: 14px;
top: 14px;
animation-delay: 0.26s;
}
.point-loading .point:nth-child(3) {
left: 50%;
top: 0;
margin-left: -10px;
animation-delay: 0.39s;
}
.point-loading .point:nth-child(4) {
top: 14px;
right: 14px;
animation-delay: 0.52s;
}
.point-loading .point:nth-child(5) {
right: 0;
top: 50%;
margin-top: -10px;
animation-delay: 0.65s;
}
.point-loading .point:nth-child(6) {
right: 14px;
bottom: 14px;
animation-delay: 0.78s;
}
.point-loading .point:nth-child(7) {
bottom: 0;
left: 50%;
margin-left: -10px;
animation-delay: 0.91s;
}
.point-loading .point:nth-child(8) {
bottom: 14px;
left: 14px;
animation-delay: 1.04s;
}
Loading动画2:
<!-- html代码 -->
<div class="loading"></div>
/*css代码*/
/*首先是定义动画效果*/
@keyframes rotateLoading {
from {
transform:rotate(0deg);
}
100% {
transform: rotate(360deg);
}
}
/*定义基本样式,绑定动画,定义动画属性*/
.loading {
margin: 50px auto;
width: 100px;
height: 100px;
border-radius: 50%;
border: 10px solid rgba(0, 0, 0, 0.2);
border-top-color: #000;
position: relative;
animation-name: rotateLoading;
animation-timing-function: linear;
animation-duration: 1.1s;
animation-iteration-count: infinite;
}
Loading动画3:
<!--html代码 共5个柱状 -->
<div class="pillar-loading">
<span class="pillar"></span>
<span class="pillar"></span>
<span class="pillar"></span>
<span class="pillar"></span>
<span class="pillar"></span>
</div>
/*css代码*/
@keyframes pillarLoading {
0%,
100% {
background: lightgreen;
}
50% {
transform: scaleY(1.75);
background: lightblue;
}
}
.pillar-loading {
margin: 150px auto;
width: 60px;
display: flex;
justify-content: space-between;
}
.pillar-loading .pillar {
width: 8px;
height: 40px;
border-radius: 4px;
background: lightgreen;
animation-name: pillarLoading;
animation-iteration-count: infinite;
animation-duration: 1s;
animation-timing-function: ease;
}
.pillar-loading .pillar:nth-child(2){
animation-delay: 0.2s;
}
.pillar-loading .pillar:nth-child(3){
animation-delay: 0.4s;
}
.pillar-loading .pillar:nth-child(4){
animation-delay: 0.6s;
}
.pillar-loading .pillar:nth-child(5){
animation-delay: 0.8s;
}
以上3个动画是Animation动画的简单示例。
下面再说一个动画必备属性 transform。
transform 本意是变形,变换之意,在 CSS 中使用该属性可对元素进行移动(translate)、旋转(rotate)、缩放(scale)、倾斜(skew)等效果。因其有着各种特效及优良的性能,所以成为动画的标配。
** 转换方法**
一个简单的小球动画,鼠标移到小球上或者空白框内,小球开始做动画,鼠标移出,动画停止。
<!-- html代码 -->
<div class="box">
<div class="circle"></div>
</div>
.box {
width: 600px;
height: 200px;
border: 1px solid #ccc;
background: #fff;
margin: 50px,auto
}
.circle {
width: 50px;
height: 50px;
background: blue;
border-radius: 50%;
margin: 75px,0;
transition: all 2s /*2s完成*/
}
.box:hover .circle {
background: red;
transform: translate(550px,0) /*沿x轴偏移550px*/
}
再来一个稍微难一点的。
<!-- html代码 -->
<a href="https://y.qq.com/n/yqq/album/002JRl3m16wLPL.html" class="playlist-item">
<div class="item-bd">
<img class="item-img" src="http://coding.imweb.io/img/p3/transition-hover.jpg" alt="">
<i class="icon-play"></i>
</div>
<div class="item-ft">
<h3 class="item-tt">漂洋过海来看你 OST 原声辑</h3>
<p class="item-author">严艺丹</p>
</div>
</a>
/*css样式代码*/
.playlist-item {
display: block;
margin-top: 100px;
width: 300px;
background: rgba(0, 0, 0, .6);
}
.playlist-item:hover {
background: #31c27c;
}
.playlist-item .item-bd {
overflow: hidden;
position: relative;
}
.playlist-item .item-img {
width: 100%;
transition:all 0.75s;
}
.playlist-item .icon-play {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%) scale(.7);
width: 70px;
height: 70px;
background: url(http://coding.imweb.io/img/p3/transition-cover_play.png) no-repeat;
opacity: 0;
}
.playlist-item .item-bd:hover .item-img {
transform:scale(1.1);
}
.playlist-item .item-bd:hover .icon-play {
opacity: 0.8;
transform: translate(-50%, -50%) scale(1);
}
.playlist-item .item-ft {
color: #fff;
padding: 15px 10px;
text-align: center;
}
.playlist-item .item-tt {
font-size: 16px;
position: relative;
display: inline-block;
vertical-align: middle;
}
.playlist-item .item-tt::after {
content: "...";
width: 18px;
height: 18px;
font-size: 12px;
color: #fff;
border-radius: 50%;
border: 2px solid #fff;
position: absolute;
right: -25px;
top: 50%;
transform: translate(0, -50%);
line-height: 0.6;
box-sizing: border-box;
opacity: 0;
transition:all 0.75s;
}
.playlist-item .item-author {
color: #999;
}
.playlist-item:hover .item-author {
color: #c1e9d5;
}
.playlist-item:hover .item-tt::after {
opacity:1;
}