<!doctype html>
<html>
<head>
<title>全屏显示</title>
<meta charset="utf-8" />
<style>
div {
width: 200px;
height:200px;
background:pink;
margin:100px auto;
}
button {
margin-left: 650px;
}
h1 {
margin-left: 400px;
}
</style>
</head>
<body>
<h1>js控制页面的全屏展示和退出全屏显示</h1>
<div id="div1"></div>
<button type="button" id="btn">全屏</button>
</body>
</html>
<!doctype html>
<html>
<head>
<title>全屏