其实css3动画是就是2种实现，一种是transition，另一种就是animation。transition实现的话就是只能定制开始帧，和结束2帧；而animation实现的话可以写很多关键帧。
没有前戏，直进主题。
transition
包含4个值，例如：-webkit-transition:all .5s ease 1s;
分别顺序是(m代表必须)： 变换的属性(m)、变换过渡的时间(m)、变换的速率、变换延时执行的时间。
来个小demo：
<!DOCTYPE html>
<html>
<head>
<title></title>
<meta charset="utf-8">
<style>
.transition {
width:30px;
height: 30px;
line-height: 30px;
border-radius: 50%;
text-align: center;
display: inline-block;
background:lightblue;
-webkit-transition:all .5s ease;
transition:all .5s ease;
color:#fff;
}
.transition:hover {
-webkit-transform:rotate(360deg);
transform:rotate(360deg);
}
</style>
</head>
<body>
<div class="transition">×</div>
</body>
</html>
应用例子：
http://skyweaver213.github.io/slide/widget/slide2/slide.html
http://skyweaver213.github.io/slide/widget/slide3/slide.html
animation：
就是一个动画对应一个keyframes，然后一个keyframes 里可以有N多个关键帧。
例如一个keyframes里我们可以这样写：
@-webkit-keyframes go {
0%, 100% {
-webkit-transform: translateX(0);
}
50% {
-webkit-transform: translateX(500px);
}
}
然后我们需要在应用这个keyframes的元素上写一个animation,
例如：-webkit-animation:go 2.5s ease infinite 0;
参数顺序分别是(m代表必须)：动画名字(m)、执行的时间(m)、过渡的速率、执行多小次、延迟执行的时间
小demo：
<!DOCTYPE html>
<html>
<head>
<title></title>
<style>
.animation {
width: 100px;
height: 100px;
display: block;
background: pink;
-webkit-animation: go 2.5s infinite;
/*-webkit-animation: go 2.5s cubic-bezier(.25, -0.25, .75, 1.25) infinite;*/
} @-webkit-keyframes go {
0%, 100% {
-webkit-transform: translateX(0);
}
50% {
-webkit-transform: translateX(500px);
}
}
</style>
</head>
<body> <div class="animation"></div> </body>
</html>
应用deom：loading状态、三条线变箭头。
http://skyweaver213.github.io/slide/widget/slide1/slide.html
<!DOCTYPE html>
<html>
<head>
<title></title>
<style>
.loading {
position: relative;
width: 40px;
height: 40px;
margin: 40px auto;
-webkit-transform:rotate(165deg);
}
.loading:before, .loading:after {
content: '';
position: absolute;
width: 8px;
height: 8px;
top: 50%;
left: 50%;
display: inline-block;
border-radius: 4px;
-webkit-transform: translate(-50%, -50%);
}
.loading:before {
-webkit-animation:before 2s infinite;
}
.loading:after {
-webkit-animation:after 2s infinite;
} @-webkit-keyframes before {
0% {
width: 8px;
box-shadow: 16px -8px rgba(225, 20, 98, 0.75), -16px 8px rgba(111, 202, 220, 0.75);
} 35% {
width: 40px;
box-shadow: 0 -8px rgba(225, 20, 98, 0.75), 0 8px rgba(111, 202, 220, 0.75);
} 70% {
width: 8px;
box-shadow: -16px -8px rgba(225, 20, 98, 0.75), 16px 8px rgba(111, 202, 220, 0.75);
} 100% {
box-shadow: 16px -8px rgba(225, 20, 98, 0.75), -16px 8px rgba(111, 202, 220, 0.75);
}
} @-webkit-keyframes after {
0% {
height: 8px;
box-shadow: 8px 16px rgba(61, 184, 143, 0.75), -8px -16px rgba(233, 169, 32, 0.75);
} 35% {
height: 40px;
box-shadow:8px 0 rgba(61, 184, 143, 0.75),-8px 0 rgba(233, 169, 32, 0.75);
} 70% {
height: 8px;
box-shadow: 8px -16px rgba(61, 184, 143, 0.75), -8px 16px rgba(233, 169, 32, 0.75);
} 100% {
box-shadow: 8px 16px rgba(61, 184, 143, 0.75), -8px -16px rgba(233, 169, 32, 0.75);
}
} </style>
</head>
<body>
<div class="loading"></div>
</body>
</html>
变换成箭头：
<!DOCTYPE html>
<html>
<head>
<title></title>
<style>
* {
margin:0;
padding:0;
}
.arrow_div {
width: 100px;
height: 100px;
background: #000;
position: relative;
}
.arrow {
width: 33px;
height: 4px;
display: inline-block;
background: #fff;
position: absolute;
left:0;
right:0;
} .arrow_body {
margin: auto;
top:40px;
-webkit-animation: 2s linear body_kf infinite;
} @-webkit-keyframes body_kf {
0% { }
30%, 50% {
-webkit-transform: rotate(180deg);
}
80%, 100% {
-webkit-transform: rotate(360deg);
} } .sleft {
width: 33px;
height: 33px;
border: transparent;
position: absolute;
top: 25px;
margin: 0 auto;
left: 0;
right: 0;
-webkit-animation: 2s linear sleft_kf infinite;
}
.sleft:before {
content: '';
width: 33px;
height: 4px;
display: inline-block;
background: #fff;
top: 0;
position: absolute;
-webkit-animation: 2s linear sleft_before_kf infinite;
}
@-webkit-keyframes sleft_kf {
0% {}
30%, 50% {
-webkit-transform: rotate(222deg);
}
80%,100% {
-webkit-transform: rotate(360deg);
}
}
@-webkit-keyframes sleft_before_kf {
0%, 100%{}
20% {
width: 28px;
top: 1px;
left: 3px;
}
25% {
width: 26px;
top: 2px;
left: 6px;
}
30%, 40%, 50% {
width: 22px;
top: 3px;
left: 8px;
}
80% {
width: 33px;
top:0;
left:0;
}
}
.sright {
width: 33px;
height: 33px;
border: transparent;
position: absolute;
margin: 0 auto;
left: 0;
right: 0;
top: 25px;
position: absolute;
-webkit-animation: 2s linear sright_kf infinite; } .sright:before {
content: '';
width: 33px;
height: 4px;
display: inline-block;
background: #fff;
bottom: 0;
position: absolute;
-webkit-animation: 2s linear sright_before_kf infinite;
}
@-webkit-keyframes sright_kf {
0% {}
30%, 50% {
-webkit-transform: rotate(135deg);
}
80%,100% {
-webkit-transform: rotate(360deg);
}
}
@-webkit-keyframes sright_before_kf {
0%,100% {}
20% {
width: 28px;
bottom: 1px;
right: 1px;
}
25% {
width: 25px;
bottom: 2px;
right: 2px;
}
30%, 40%, 50% {
width: 22px;
bottom: 3px;
right: 3px;
} 80% {
width: 33px;
bottom: 0;
right:0;
}
} </style>
</head>
<body>
<div class="arrow_div">
<div class="sleft"></div>
<i class="arrow arrow_body"></i>
<div class="sright"></div>
</div>
</body>
</html>