需求:gift图片的小动画每隔2s执行一次。javascript
需求就一句话,咱们看一下实现过程。css
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <style> a { display: inline-block; background-color: #cc2222; text-decoration: none; color: #fff; font-size: 14px; padding: 10px 12px; width: 100px; position: relative; } .ico { position: absolute; width: 14px; height: 16px; background: url(images/ico.png) no-repeat center; background-size: 100%; position: absolute; top: 4px; right: 27px; } </style> </head> <body> <nav> <a href="javascript:;" class="box"> 一元夺宝 <div class="ico"></div> </a> </nav> </body> </html>
原始动画效果为:鼠标hover上去出现动画。html
动画样式以下:java
/*动画*/ .ico:hover{ -webkit-animation: Tada 1s both; -moz-animation: Tada 1s both; -ms-animation: Tada 1s both; animation: Tada 1s both } /*浏览器兼容性部分略过*/ @keyframes Tada { 0% { transform: scale(1); transform: scale(1) } 10%,20% { transform: scale(0.9) rotate(-3deg); transform: scale(0.9) rotate(-3deg) } 30%,50%,70%,90% { transform: scale(1.1) rotate(3deg); transform: scale(1.1) rotate(3deg) } 40%,60%,80% { transform: scale(1.1) rotate(-3deg); transform: scale(1.1) rotate(-3deg) } 100% { transform: scale(1) rotate(0); transform: scale(1) rotate(0) } }
效果:鼠标hover上去gift图片会动一动。css3
需求变更,要求再也不是hover上去展现动画,而是每隔2s展现一次动画。web
思路:不须要hover上去出现动画,就把hover去掉,每隔2s显示一次动画,很容易想到延迟2s,而后动画一直执行。浏览器
此时相关样式变成:ide
.ico{ -webkit-animation: Tada 1s 2s both infinite; -moz-animation: Tada 1s 2s both infinite; -ms-animation: Tada 1s 2s both infinite; animation: Tada 1s 2s both infinite; }
可是显示的效果是:页面加载第一次出现动画会延迟2s,后面的动画将再也不有延迟。以下,这是不符合需求的。学习
为了看出效果,下图为延迟6s的效果。动画
此时换种思路,不要延迟执行动画,而是动画的效果自己就是前2s元素不动,后1s是元素动,而后一直循环执行。 这样在视觉上就会看起来是延迟2s执行1s动画。
计算一下,原来的百分比节点变成了多少。
将动画总时长变成3s,用计算出的百分比替换原来的百分比,代码以下:
.ico{ -webkit-animation: Tada 3s both infinite; -moz-animation: Tada 3s both infinite; -ms-animation: Tada 3s both infinite; animation: Tada 3s both infinite; } @keyframes Tada { 0% { transform: scale(1); transform: scale(1) } 70%,73%{ transform: scale(0.9) rotate(-3deg); transform: scale(0.9) rotate(-3deg) } 77%,83%,90%,97% { transform: scale(1.1) rotate(3deg); transform: scale(1.1) rotate(3deg) } 80%,87%,93%{ transform: scale(1.1) rotate(-3deg); transform: scale(1.1) rotate(-3deg) } 100% { transform: scale(1) rotate(0); transform: scale(1) rotate(0) } }
效果就是咱们指望的了。
完整代码以下:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>demo of starof</title> <style> a { display: inline-block; background-color: #cc2222; text-decoration: none; color: #fff; font-size: 14px; padding: 10px 12px; width: 100px; position: relative; } .ico { position: absolute; width: 14px; height: 16px; background: url(images/ico.png) no-repeat center; background-size: 100%; position: absolute; top: 4px; right: 27px; } /*动画*/ .ico{ -webkit-animation: Tada 3s both infinite; -moz-animation: Tada 3s both infinite; -ms-animation: Tada 3s both infinite; animation: Tada 3s both infinite; } @-webkit-keyframes Tada { 0% { -webkit-transform: scale(1); transform: scale(1) } 70%,73% { -webkit-transform: scale(0.9) rotate(-3deg); transform: scale(0.9) rotate(-3deg) } 77%,83%,90%,97% { -webkit-transform: scale(1.1) rotate(3deg); transform: scale(1.1) rotate(3deg) } 80%,87%,93% { -webkit-transform: scale(1.1) rotate(-3deg); transform: scale(1.1) rotate(-3deg) } 100% { -webkit-transform: scale(1) rotate(0); transform: scale(1) rotate(0) } } @-moz-keyframes Tada { 0% { -moz-transform: scale(1); transform: scale(1) } 70%,73% { -moz-transform: scale(0.9) rotate(-3deg); transform: scale(0.9) rotate(-3deg) } 77%,83%,90%,97% { -moz-transform: scale(1.1) rotate(3deg); transform: scale(1.1) rotate(3deg) } 80%,87%,93%{ -moz-transform: scale(1.1) rotate(-3deg); transform: scale(1.1) rotate(-3deg) } 100% { -moz-transform: scale(1) rotate(0); transform: scale(1) rotate(0) } } @-ms-keyframes Tada { 0% { -ms-transform: scale(1); transform: scale(1) } 70%,73% { -ms-transform: scale(0.9) rotate(-3deg); transform: scale(0.9) rotate(-3deg) } 77%,83%,90%,97% { -ms-transform: scale(1.1) rotate(3deg); transform: scale(1.1) rotate(3deg) } 80%,87%,93% { -ms-transform: scale(1.1) rotate(-3deg); transform: scale(1.1) rotate(-3deg) } 100% { -ms-transform: scale(1) rotate(0); transform: scale(1) rotate(0) } } @keyframes Tada { 0% { transform: scale(1); transform: scale(1) } 70%,73%{ transform: scale(0.9) rotate(-3deg); transform: scale(0.9) rotate(-3deg) } 77%,83%,90%,97% { transform: scale(1.1) rotate(3deg); transform: scale(1.1) rotate(3deg) } 80%,87%,93%{ transform: scale(1.1) rotate(-3deg); transform: scale(1.1) rotate(-3deg) } 100% { transform: scale(1) rotate(0); transform: scale(1) rotate(0) } } </style> </head> <body> <nav> <a href="javascript:;" class="box"> 一元夺宝 <div class="ico"></div> </a> </nav> </body> </html>
本文只是介绍一种思路,关于动画各个参数详情可参考:
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