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。

css3动画属性
Loading动画1:

点.gif
- <!-- 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:

圆环.gif
- <!-- 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:

柱状.gif
- <!--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**

transform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。

小球动画
- <!-- 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。

transform动画
- <!-- 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;
- }
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持w3xue。