HTML5CSS3 special effects-ball jumping up and down
(-1)写在前面
我用的是chrome49，这个idea是我在stackoverflow上回答问题时看到了，多谢这位同行，加深了我对很多技术点的理解，最近刚到北京，忙碌了一两天，在后续的日子里，会被安排面试，学习计划只能按工作流走了，做完这个要看一个特别酷的效果，好激动!
(0)效果演示
（1）实现方案
动画效果都是用animation做的
（2）知识点详解
a. border-radius:40px;
当div的长高都是80px的时候，div是一个圆形，其实长高都是60px的时候也是圆型，同理都是40、30也是圆型，当然案例中没有使用这种方式。具体实现在代码中说明
b. position:absolute;
当div使用此属性时，margin：0 auto是无效的，小球使用了这个属性，他的水平居中的实现方式在代码中说明
c. animation:down 1.5s infinite alternate;
I.1.5s 是动画的持续时间，因为延迟时间出现在持续时间的后面，所以只出现一个带s的参数是持续时间。
II.这里的alternate是指反向播放动画，比如说一个动画的帧如下
@keyframes down
{
from
{
…
}
95%
{
…
}
to
{
…
}
}正向播放是from-95-to,反向播放to-95%-from
d. @keyframes down{95%{…}}
如果对应animate：down 1.5s;
动画在执行到95%就到达了最终状态，剩余5%的时间会用在回到初始状态。
(3)代码加解释
<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8>
<link rel="shortcut icon" href="favicon.ico" type="image/x-icon">
<title>为了生活</title>
<style type="text/css">
*
{
margin:0;
padding:0;
}
#lol
{
margin:0px auto;
top:100px;
width:80px;
height:80px;
background-color:red;
border-radius:40px;
position:absolute;
left:160px;
animation:down 1.5s infinite alternate;
}
@keyframes down
{
95%
{
width:15px;
height:15px;
border-radius:7.5px; /*保证div始终是个圆形*/
top:300px;
left:192.5px;/*保证小球始终水平居中*/
background:blue;
}
}
#frame
{
width:400px;
height:315px;
margin:100px auto;
border:1px red solid;
position:relative;
}
#head
{
width:400px;
height:100px;
text-align:center;
font-size:40px;
font-weight:bold;
line-height:100px;
background-image:-webkit-linear-gradient(90deg, #be1e1e, #be9b1e, #1ebe21, #1ebeb5, #1e24be, #ba1ebe, #be1e1e);
/*前面文章有提到*/
-webkit-background-clip: text;/*剪切背景颜色，只在文字上显示*/
-webkit-text-fill-color:transparent;/*文字填充为透明色*/
background-size:100% 700%;
/*前面文章有提到*/
animation:bc 6s infinite;
}
@keyframes bc
{
to
{
background-position:100% 100%;
/*前面文章有提到*/
}
}
</style>
<script type="text/javascript">
</script>
</head
<body>
<div id="frame">
<div id="head">Animatiom</div>
<div id="lol"></div>
</div>
</body>
</html>
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