<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>金字塔</title>
<style type="text/css">
button{
margin: 50px 50px 0px 50px;
background-color: pink;
150px;
height: 50px;
border-color: yellow;
font-size: 25px;
}
div{
margin: 10px 50px 0px 50px;
150px;
text-align: center;
}
div h3{
height: 150px;
150px;
line-height: 150px;
border-radius: 75px;
background-color: pink;
color: red;
}
.circle{
box-shadow:10px 10px 10px gray
outline：none
}
</style>
<script type="text/javascript">
window.onload=function(){
function $ (id) {
return document.getElementById(id);
}
$('btn').onclick=function(){
if ($('btn').innerHTML=="我变") {
$('bordet').innerHTML="<h3>看我变</h3><h3>再看我变</h3><h3>变完了</h3>";
$('btn').innerHTML="返回";
$('btn').style.className= "circle";
$('btn').style.outline = "none";
}else{
$('bordet').innerHTML="<h3>看我72变</h3>";
$('btn').innerHTML="我变";
$('btn').style.borderColor = "red";
$('btn').style.borderWidth = "10px";
$('btn').style.outline = "none";
}
}
}
</script>
</head>
<body>
<button id="btn">我变</button>
<div id="bordet"><h3>看我72变</h3></div>
<button>11</button>
</body>
</html>