这篇博文写的比较好,收藏下
https://www.cnblogs.com/javaee6/p/3756249.html
全屏有兼容性问题,这里针对谷歌浏览器举例
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<button onclick="fullScreen()">全屏</button>
<button onclick="exitFullScreen()">退出全屏</button>
<div style="background:red;width:200px;height:200px" id="box">111</div>
<script>
function fullScreen () {
document.documentElement.webkitRequestFullScreen()
}
function exitFullScreen () {
document.webkitCancelFullScreen()
}
</script>
</body>
</html>