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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>js缓冲效果原理</title>
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<script type="text/javascript">
var k=0;
function change(){
h=Math.ceil(0.1*(100-k));
k=k+h;
document.getElementById("num").innerHTML=k;
document.getElementById("ad").style.top=k+"px";
}
setInterval(change,100);
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