css3动画效果，如何设置呢？

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要创建 CSS3 动画，你需要了解 @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。 参考技术A 可以通过过度或animation

如何利用CSS3动画实现弹跳效果

HTML代码

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>用CSS3动画给一个小球创建跳跃的动画效果</title>
<link rel="stylesheet" type="text/css" href="index.css" />
</head>
<body>
<section class="main">
<div id="ballWrapper">
<div id="ball"></div>
<div id="ballShadow"></div>
</div>
</section>
</body>
</html>

CSS代码（创建一个与html同目录的index.css文件）

#ballWrapperposition:fixed;top:35%;left:50%;z-index:100;margin-left:-70px;width:140px;height:300px;cursor:pointer;-webkit-transition:all 5s linear 0s;-moz-transition:all 5s linear 0s;transition:all 5s linear 0s;-webkit-transform:scale(1);-moz-transform:scale(1);-o-transform:scale(1);transform:scale(1);-ms-transform:scale(1)
#ballWrapper:activecursor:pointer;-webkit-transform:scale(0);-moz-transform:scale(0);-o-transform:scale(0);transform:scale(0);-ms-transform:scale(0)
#ballposition:absolute;top:0;z-index:11;width:140px;height:140px;border-radius:70px;background:#bbb;background:url(data:image/svg+xml; background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(187,187,187,1)), color-stop(99%,rgba(119,119,119,1))); background: -webkit-linear-gradient(top, rgba(187,187,187,1) 0%,rgba(119,119,119,1) 99%); background: -o-linear-gradient(top, rgba(187,187,187,1) 0%,rgba(119,119,119,1) 99%); background: -ms-linear-gradient(top, rgba(187,187,187,1) 0%,rgba(119,119,119,1) 99%); background: linear-gradient(top, rgba(187,187,187,1) 0%,rgba(119,119,119,1) 99%); box-shadow: inset 0 -5px 15px rgba(255,255,255,0.4), inset -2px -1px 40px rgba(0,0,0,0.4), 0 0 1px #000; cursor: pointer; base64,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);background:-moz-linear-gradient(top,rgba(187,187,187,1) 0,rgba(119,119,119,1) 99%);filter:progid:DXImageTransform.Microsoft.gradient( startColorstr='#bbbbbb', endColorstr='#777777', GradientType=0 );-webkit-animation:jump 1s infinite;-moz-animation:jump 1s infinite;-o-animation:jump 1s infinite;-ms-animation:jump 1s infinite;animation:jump 1s infinite
#ball::afterposition:absolute;top:10px;left:30px;z-index:10;width:80px;height:40px;border-radius:40px/20px;background:url(data:image/svg+xml; background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(232,232,232,1)), color-stop(1%,rgba(232,232,232,1)), color-stop(100%,rgba(255,255,255,0))); background: -webkit-linear-gradient(top, rgba(232,232,232,1) 0%,rgba(232,232,232,1) 1%,rgba(255,255,255,0) 100%); background: -o-linear-gradient(top, rgba(232,232,232,1) 0%,rgba(232,232,232,1) 1%,rgba(255,255,255,0) 100%); background: -ms-linear-gradient(top, rgba(232,232,232,1) 0%,rgba(232,232,232,1) 1%,rgba(255,255,255,0) 100%); background: linear-gradient(top, rgba(232,232,232,1) 0%,rgba(232,232,232,1) 1%,rgba(255,255,255,0) 100%); content: ""; base64,PD94bWwgdmVyc2lvbj0iMS4wIiA/Pgo8c3ZnIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgd2lkdGg9IjEwMCUiIGhlaWdodD0iMTAwJSIgdmlld0JveD0iMCAwIDEgMSIgcHJlc2VydmVBc3BlY3RSYXRpbz0ibm9uZSI+CiAgPGxpbmVhckdyYWRpZW50IGlkPSJncmFkLXVjZ2ctZ2VuZXJhdGVkIiBncmFkaWVudFVuaXRzPSJ1c2VyU3BhY2VPblVzZSIgeDE9IjAlIiB5MT0iMCUiIHgyPSIwJSIgeTI9IjEwMCUiPgogICAgPHN0b3Agb2Zmc2V0PSIwJSIgc3RvcC1jb2xvcj0iI2U4ZThlOCIgc3RvcC1vcGFjaXR5PSIxIi8+CiAgICA8c3RvcCBvZmZzZXQ9IjElIiBzdG9wLWNvbG9yPSIjZThlOGU4IiBzdG9wLW9wYWNpdHk9IjEiLz4KICAgIDxzdG9wIG9mZnNldD0iMTAwJSIgc3RvcC1jb2xvcj0iI2ZmZmZmZiIgc3RvcC1vcGFjaXR5PSIwIi8+CiAgPC9saW5lYXJHcmFkaWVudD4KICA8cmVjdCB4PSIwIiB5PSIwIiB3aWR0aD0iMSIgaGVpZ2h0PSIxIiBmaWxsPSJ1cmwoI2dyYWQtdWNnZy1nZW5lcmF0ZWQpIiAvPgo8L3N2Zz4=);background:-moz-linear-gradient(top,rgba(232,232,232,1) 0,rgba(232,232,232,1) 1%,rgba(255,255,255,0) 100%);filter:progid:DXImageTransform.Microsoft.gradient( startColorstr='#e8e8e8', endColorstr='#00ffffff', GradientType=0 )
#ballShadowposition:absolute;bottom:0;left:50%;z-index:10;margin-left:-30px;width:60px;height:75px;border-radius:30px/40px;background:rgba(20,20,20,.1);box-shadow:0 0 20px 35px rgba(20,20,20,.1);-webkit-transform:scaleY(.3);-moz-transform:scaleY(.3);-o-transform:scaleY(.3);transform:scaleY(.3);-ms-transform:scaleY(.3);-webkit-animation:shrink 1s infinite;-moz-animation:shrink 1s infinite;-o-animation:shrink 1s infinite;-ms-animation:shrink 1s infinite;animation:shrink 1s infinite
@-webkit-keyframes jump0%top:0;-webkit-animation-timing-function:ease-in
50%top:140px;height:140px;-webkit-animation-timing-function:ease-out
55%top:160px;height:120px;border-radius:70px/60px;-webkit-animation-timing-function:ease-in
65%top:120px;height:140px;border-radius:70px;-webkit-animation-timing-function:ease-out
95%top:0;-webkit-animation-timing-function:ease-in
100%top:0;-webkit-animation-timing-function:ease-in

@-moz-keyframes jump0%top:0;-moz-animation-timing-function:ease-in
50%top:140px;height:140px;-moz-animation-timing-function:ease-out
55%top:160px;height:120px;border-radius:70px/60px;-moz-animation-timing-function:ease-in
65%top:120px;height:140px;border-radius:70px;-moz-animation-timing-function:ease-out
95%top:0;-moz-animation-timing-function:ease-in
100%top:0;-moz-animation-timing-function:ease-in

@-o-keyframes jump0%top:0;-o-animation-timing-function:ease-in
50%top:140px;height:140px;-o-animation-timing-function:ease-out
55%top:160px;height:120px;border-radius:70px/60px;-o-animation-timing-function:ease-in
65%top:120px;height:140px;border-radius:70px;-o-animation-timing-function:ease-out
95%top:0;-o-animation-timing-function:ease-in
100%top:0;-o-animation-timing-function:ease-in

@-ms-keyframes jump0%top:0;-ms-animation-timing-function:ease-in
50%top:140px;height:140px;-ms-animation-timing-function:ease-out
55%top:160px;height:120px;border-radius:70px/60px;-ms-animation-timing-function:ease-in
65%top:120px;height:140px;border-radius:70px;-ms-animation-timing-function:ease-out
95%top:0;-ms-animation-timing-function:ease-in
100%top:0;-ms-animation-timing-function:ease-in

@keyframes jump0%top:0;animation-timing-function:ease-in
50%top:140px;height:140px;animation-timing-function:ease-out
55%top:160px;height:120px;border-radius:70px/60px;animation-timing-function:ease-in
65%top:120px;height:140px;border-radius:70px;animation-timing-function:ease-out
95%top:0;animation-timing-function:ease-in
100%top:0;animation-timing-function:ease-in

@-webkit-keyframes shrink0%bottom:0;margin-left:-30px;width:60px;height:75px;border-radius:30px/40px;background:rgba(20,20,20,.1);box-shadow:0 0 20px 35px rgba(20,20,20,.1);-webkit-animation-timing-function:ease-in
50%bottom:30px;margin-left:-10px;width:20px;height:5px;border-radius:20px;background:rgba(20,20,20,.3);box-shadow:0 0 20px 35px rgba(20,20,20,.3);-webkit-animation-timing-function:ease-out
100%bottom:0;margin-left:-30px;width:60px;height:75px;border-radius:30px/40px;background:rgba(20,20,20,.1);box-shadow:0 0 20px 35px rgba(20,20,20,.1);-webkit-animation-timing-function:ease-in

@-moz-keyframes shrink0%bottom:0;margin-left:-30px;width:60px;height:75px;border-radius:30px/40px;background:rgba(20,20,20,.1);box-shadow:0 0 20px 35px rgba(20,20,20,.1);-moz-animation-timing-function:ease-in
50%bottom:30px;margin-left:-10px;width:20px;height:5px;border-radius:20px;background:rgba(20,20,20,.3);box-shadow:0 0 20px 35px rgba(20,20,20,.3);-moz-animation-timing-function:ease-out
100%bottom:0;margin-left:-30px;width:60px;height:75px;border-radius:30px/40px;background:rgba(20,20,20,.1);box-shadow:0 0 20px 35px rgba(20,20,20,.1);-moz-animation-timing-function:ease-in

@-o-keyframes shrink0%bottom:0;margin-left:-30px;width:60px;height:75px;border-radius:30px/40px;background:rgba(20,20,20,.1);box-shadow:0 0 20px 35px rgba(20,20,20,.1);-o-animation-timing-function:ease-in
50%bottom:30px;margin-left:-10px;width:20px;height:5px;border-radius:20px;background:rgba(20,20,20,.3);box-shadow:0 0 20px 35px rgba(20,20,20,.3);-o-animation-timing-function:ease-out
100%bottom:0;margin-left:-30px;width:60px;height:75px;border-radius:30px/40px;background:rgba(20,20,20,.1);box-shadow:0 0 20px 35px rgba(20,20,20,.1);-o-animation-timing-function:ease-in

@-ms-keyframes shrink0%bottom:0;margin-left:-30px;width:60px;height:75px;border-radius:30px/40px;background:rgba(20,20,20,.1);box-shadow:0 0 20px 35px rgba(20,20,20,.1);-ms-animation-timing-function:ease-in
50%bottom:30px;margin-left:-10px;width:20px;height:5px;border-radius:20px;background:rgba(20,20,20,.3);box-shadow:0 0 20px 35px rgba(20,20,20,.3);-ms-animation-timing-function:ease-out
100%bottom:0;margin-left:-30px;width:60px;height:75px;border-radius:30px/40px;background:rgba(20,20,20,.1);box-shadow:0 0 20px 35px rgba(20,20,20,.1);-ms-animation-timing-function:ease-in

@keyframes shrink0%bottom:0;margin-left:-30px;width:60px;height:75px;border-radius:30px/40px;background:rgba(20,20,20,.1);box-shadow:0 0 20px 35px rgba(20,20,20,.1);animation-timing-function:ease-in
50%bottom:30px;margin-left:-10px;width:20px;height:5px;border-radius:20px;background:rgba(20,20,20,.3);box-shadow:0 0 20px 35px rgba(20,20,20,.3);animation-timing-function:ease-out
100%bottom:0;margin-left:-30px;width:60px;height:75px;border-radius:30px/40px;background:rgba(20,20,20,.1);box-shadow:0 0 20px 35px rgba(20,20,20,.1);animation-timing-function:ease-in

 参考技术A

    首先给你要弹跳的东西设置好样式

    <!-- 比如我给a标签做个弹跳效果-->
    <!-- 先学样式 -->
    <style>
        #btn
            display:inline-block;
            background: #98CECB;
            color: #fff;
            padding: 10px 20px;
            position:absolute;/*定位好用改变bottom是其动起来*/
        
    </selty>
    <a href="javascript:void(0)" id="btn">按钮</a>

    <!-- 在写一个用关键证做的动画 -->
    <style>
    @keyframes tantiao
    frombox-shadow:0 -5px 20px rgba(0,0,0,0.5);bottom:0;
    tobox-shadow:0 30px 30px rgba(0,0,0,0.1);bottom:30px;

    </style>

    <!-- 最后在给这个元素加上动画 -->
    #btn
    animation:tantiao 0.5s cubic-bezier(0.1,0.25,0.1,1) 0s infinite alternate both;


 参考技术B 利用css3.0的新属性animate 就可以实现，具体怎么实现，百度一下会有很多教程的

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