html5中css3新添加的动画效果

字css3中,动画着重要说的就是:transition属性,表示过渡


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如何定义一个动画:

如需在 CSS3 中创建动画,您需要学习 @keyframes 规则。

<!DOCTYPE html>
<html>
<head>
<style> 
div
{
width:100px;
height:100px;
background:red;
position:relative;
animation:myfirst 5s;//为这个div附加一个动画 名字为myfirst
-moz-animation:myfirst 5s; /* Firefox */
-webkit-animation:myfirst 5s; /* Safari and Chrome */
-o-animation:myfirst 5s; /* Opera */
}

@keyframes myfirst//规定动画的执行过程
{
0%   {background:red; left:0px; top:0px;}
25%  {background:yellow; left:200px; top:0px;}
50%  {background:blue; left:200px; top:200px;}
75%  {background:green; left:0px; top:200px;}
100% {background:red; left:0px; top:0px;}
}

@-moz-keyframes myfirst /* Firefox */
{
0%   {background:red; left:0px; top:0px;}
25%  {background:yellow; left:200px; top:0px;}
50%  {background:blue; left:200px; top:200px;}
75%  {background:green; left:0px; top:200px;}
100% {background:red; left:0px; top:0px;}
}

@-webkit-keyframes myfirst /* Safari and Chrome */
{
0%   {background:red; left:0px; top:0px;}
25%  {background:yellow; left:200px; top:0px;}
50%  {background:blue; left:200px; top:200px;}
75%  {background:green; left:0px; top:200px;}
100% {background:red; left:0px; top:0px;}
}

@-o-keyframes myfirst /* Opera */
{
0%   {background:red; left:0px; top:0px;}
25%  {background:yellow; left:200px; top:0px;}
50%  {background:blue; left:200px; top:200px;}
75%  {background:green; left:0px; top:200px;}
100% {background:red; left:0px; top:0px;}
}
</style>
</head>
<body>

<p><b>注释:<div></div></b>本例在 Internet Explorer 中无效。</p>



</body>
</html>
如何创建一个过渡

<!DOCTYPE html>
<html>
<head>
<style> 
div
{
width:100px;
height:100px;
background:yellow;
transition-property:width;
transition-duration:1s;
transition-timing-function:linear;
transition-delay:2s;
/* Firefox 4 */
-moz-transition-property:width;
-moz-transition-duration:1s;
-moz-transition-timing-function:linear;
-moz-transition-delay:2s;
/* Safari and Chrome */
-webkit-transition-property:width;
-webkit-transition-duration:1s;
-webkit-transition-timing-function:linear;
-webkit-transition-delay:2s;
/* Opera */
-o-transition-property:width;
-o-transition-duration:1s;
-o-transition-timing-function:linear;
-o-transition-delay:2s;
}

div:hover
{
width:200px;
}
</style>
</head>
<body>

<div></div>

<p>请把鼠标指针放到黄色的 div 元素上,来查看过渡效果。</p>

<p><b>注释:</b>本例在 Internet Explorer 中无效。</p>

<p><b>注释:</b>这个过渡效果会在开始之前等待两秒。</p>

</body>
</html>

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