<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>fullscreen</title>
</head>
<body>
<div id="content" style="width:500px;height:500px;">
这是被全屏的元素
<button id=‘btn‘>全屏</button>
<button id="closeBtn">退出全屏</button>
</div>
<script type="text/javascript">
let content = document.getElementById(‘content‘);
let openBtn = document.getElementById(‘btn‘);
let closeBtn = document.getElementById(‘closeBtn‘);
openBtn.onclick = function(){
fullScreen(content);
}
closeBtn.onclick = function(){
closeFullScreen();
}
// 开启全屏
function fullScreen(elem){
let docElm = document.documentElement;
if (docElm.requestFullscreen) {
// console.log(1)
docElm.requestFullscreen();
} else if (docElm.mozRequestFullScreen) {
// console.log(2)
docElm.mozRequestFullScreen(); // firefox
} else if (docElm.webkitRequestFullScreen) {
// console.log(‘webkit内核‘) // chrome、360、QQ、遨游
docElm.webkitRequestFullScreen();
} else if (docElm.msRequestFullscreen) {
// console.log(4)
elem.msRequestFullscreen(); // IE
}
}
// 关闭全屏
function closeFullScreen(){
if (document.exitFullscreen) {
document.exitFullscreen();
}else if (document.mozCancelFullScreen) {
document.mozCancelFullScreen();
}else if (document.webkitCancelFullScreen) {
document.webkitCancelFullScreen();
}else if (document.msExitFullscreen) {
document.msExitFullscreen();
}
}
</script>
</body>
</html>
原文：https://www.cnblogs.com/lgyong/p/10406197.html