<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style>
border-radius:10px; background-image:url(1.jpg) }</style>
</head>
<body>
<input type="button" value="展开" onClick="aa()" id="cn">
<div id="cb"></div>
<script>
var cn=document.getElementById("cn");
var h=0;
function a(){
if(h<720)
{ h=h+10;
document.getElementById("cb").style.height=h+"px";
cn.value="收起";
}
else{
return
}
setTimeout(a,10);
//setTimeout(b,5000);
}
function b(){
if(h>20){
h=h-20;
document.getElementById("cb").style.height=h+"px";
cn.value="展开";
}
else{
return
}
setTimeout(b,10)
}
function aa(){
a();
b();
}
</script>
</body>
</html>
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