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效果如下：
代码如下：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<link>
<meta name="page-view-size" content="640*530">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<style>
.wapper{
position:absolute;
left:100px;
top:100px;
box-sizing:border-box;
}
.text{
position:absolute;
left:30px;
top:40px;
font-family:"Microsoft YaHei";
font-weight:bold;
color:indianred;
}
.rect{
position:absolute;
width:50px;
height:100px;
overflow:hidden;
}
.right{
left:50px;
}
.circle{
position:absolute;
width:100px;
height:100px;
border-radius:50%;
box-sizing:border-box;
border:5px solid indianred;
}
.circle_right{
left:-50px;
clip:rect(0px 50px 100px 0px);
animation:roll 5s linear 0s 1 forwards;
}
.circle_left{
clip:rect(0px 100px 100px 50px);
animation:roll 5s linear 5s 1 forwards;
}
@keyframes roll{
0%{transform:rotate(0deg)}
100%{ transform:rotate(180deg)}
}
</style>
<body leftmargin="0" topmargin="0">
<div class="wapper">
<div class="rect right"><div class="circle circle_right"></div></div>
<div class="rect left"><div class="circle circle_left"></div></div>
<div class="text"><span id="num">1</span><span>%</span></div>
</div>
</body>
<script type="text/javascript">
window.onload=function(){
var $num=document.getElementById('num');
(function(){
var i=1,timer;
add();
function add(){
var timer=setTimeout(function(){
add();
},100);
$num.innerHTML=i;
i<100?i++:clearTimeout(timer)
}
})();
}
</script>
</html>
</div>
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</div>