此练习作品是为学习HTML5+CSS3而设计的（如有不好请大家批评指教~~~）。
操作：当页面加载时，点击网页中的绿色块（一层），则有其他几块（二层）从其中央出现并向外延伸并旋转，点击这几块中任意一个颜色模块，则被点击的颜色模块将“逐渐”取代原先一层绿色模块，其余模块将渐变消失！
采用了CSS3的动画@keyframes规则设计div块的移动、伸缩、旋转和渐变：
动画定义：animation:animationName;
div块的移动：
@keyframes keyframeName{
from{divInitialLocation:value}
to{divEndLocation:value}
}
div块的伸缩:
@keyframes keyframeName{
from{transform:scale(multipleValue,multipleValue)}
to{transform:scale(multipleValue,multipleValue)}
}
div块的旋转:
@keyframes keyframeName{
from{transform:rotateY(angleValue)}
to{transform:rotateY(angleValue)}
}
div块的渐变（也是利用动画规则@keyframes和标签元素属性opacity来实现的）:
@keyframes keyframeName{
from{opacity:InitialValue}
to{opacity:Endvalue}
}
具体代码实现如下：
body部分代码：
<body> <div id="one"></div> <div id="two"></div> <div id="three"></div> <div id="four"></div> <div id="five"></div> </body>
script部分代码:
<script> window.onload=function(){ var one=document.getElementById('one'); var two=document.getElementById('two'); var three=document.getElementById('three'); var four=document.getElementById('four'); var five=document.getElementById('five'); var twotwo=document.getElementById('twotwo'); one.onclick=function(){ two.style.animation="two 5s"; two.style.display="block"; three.style.animation="three 5s"; three.style.display="block"; four.style.animation="four 5s"; four.style.display="block"; five.style.animation="five 5s"; five.style.display="block"; } two.onclick=function(){ one.style.opacity="0"; three.style.opacity="0"; four.style.opacity="0"; five.style.opacity="0"; one.style.animation="opacity 5s"; three.style.animation="opacity 5s"; four.style.animation="opacity 5s"; five.style.animation="opacity 5s"; two.style.top="50%"; two.style.transform="scale(2,2)"; two.style.animation="twotwo 5s"; } three.onclick=function(){ one.style.opacity="0"; two.style.opacity="0"; four.style.opacity="0"; five.style.opacity="0"; one.style.animation="opacity 5s"; two.style.animation="opacity 5s"; four.style.animation="opacity 5s"; five.style.animation="opacity 5s"; three.style.left="50%"; three.style.transform="scale(2,2)"; three.style.animation="threethree 5s"; } four.onclick=function(){ one.style.opacity="0"; two.style.opacity="0"; three.style.opacity="0"; five.style.opacity="0"; one.style.animation="opacity 5s"; two.style.animation="opacity 5s"; three.style.animation="opacity 5s"; five.style.animation="opacity 5s"; four.style.left="50%"; four.style.transform="scale(2,2)"; four.style.animation="fourfour 5s"; } five.onclick=function(){ one.style.opacity="0"; two.style.opacity="0"; three.style.opacity="0"; four.style.opacity="0"; one.style.animation="opacity 5s"; two.style.animation="opacity 5s"; three.style.animation="opacity 5s"; four.style.animation="opacity 5s"; five.style.top="50%"; five.style.transform="scale(2,2)"; five.style.animation="fivefive 5s"; } } </script>
style部分代码：
<style> html,div,body,canvas{ margin:0; padding:0; } div{ //border:1px solid; border-radius:50px; } #one{ position:absolute; height:100px; width:100px; top:50%; left:50%; margin:-50px 0 0 -50px; animation:one 5s; border-radius:50px; transform:scale(2,2); background:#1d953f; } #two{ position:absolute; height:100px; width:100px; top:25%; left:50%; margin:-50px 0 0 -50px; //z-index:1; //animation:two 5s; display:none; background:#ea66a6; } #three{ position:absolute; height:100px; width:100px; top:50%; left:25%; margin:-50px 0 0 -50px; //z-index:2; //animation:three 5s; display:none; background:#e0861a; } #four{ position:absolute; height:100px; width:100px; top:50%; left:75%; margin:-50px 0 0 -50px; //z-index:3; //animation:four 5s; display:none; background:#00ae9d; } #five{ position:absolute; height:100px; width:100px; top:75%; left:50%; margin:-50px 0 0 -50px; //z-index:4; //animation:five 5s; display:none; background:#ed1941; } @keyframes one{ from{transform:scale(1,1);} to{transform:scale(2,2);} } @keyframes two{ 0%{top:50%} 50%{top:25%;transform:rotateY(0deg);} 100%{transform:rotateY(360deg);} } @keyframes twotwo{ 0%{top:25%;transform:scale(1,1);} 50%{top:50%;transform:scale(1,1);} 100%{transform:scale(2,2);} } @keyframes three{ 0%{left:50%} 50%{left:25%;transform:rotateY(0deg);} 100%{transform:rotateY(360deg);} } @keyframes threethree{ 0%{left:25%;transform:scale(1,1);} 50%{left:50%;transform:scale(1,1);} 100%{transform:scale(2,2);} } @keyframes four{ 0%{left:50%} 50%{left:75%;transform:rotateY(0deg);} 100%{transform:rotateY(360deg);} } @keyframes fourfour{ 0%{left:75%;transform:scale(1,1);} 50%{left:50%;transform:scale(1,1);} 100%{transform:scale(2,2);} } @keyframes five{ 0%{top:50%} 50%{top:75%;transform:rotateY(0deg);} 100%{transform:rotateY(360deg);} } @keyframes fivefive{ 0%{top:75%;transform:scale(1,1);} 50%{top:50%;transform:scale(1,1);} 100%{transform:scale(2,2);} } @keyframes opacity{ from{opacity:1} to{opacity:0} } </style>
效果图如下：
第一幅图：
第二幅图：
第三幅图：
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