<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
.top {
margin: 15px;
}
.main {
100%;
height: 1000px;
display: flex;
}
.left {
50%;
height: 60%;
background: gray;
padding: 20px;
}
.left-son {
80%;
height: 50%;
margin: 15px;
background: red;
}
.right {
50%;
height: 60%;
background: #dddddd;
}
/* 针对dom的全屏设置 */
.left:-webkit-full-screen {
background: #fff;
}
/* 全屏属性 */
:-webkit-full-screen {}
:-moz-full-screen {}
:-ms-fullscreen {}
/* 全屏伪类 当前chrome:70 不支持 */
:full-screen {}
:fullscreen {
/* IE11支持 */
}
</style>
</head>
<body>
<div class="top">
<button onclick="leftScreen()">左边全屏</button>
<button onclick="rightScreen()">右边全屏</button>
</div>
<div class="main">
<div class="left">
<button onclick="redScreen()">红色全屏</button>
<button onclick="exitScreen()">退出全屏</button>
<div class="left-son">
<button onclick="exitScreen()">红色退出全屏</button>
<span>左边的内容</span>
</div>
</div>
<div class="right">右边的内容</div>
</div>
</body>
<script type="text/javascript">
class fullScreen {
/**
* @description: 全屏初始化
* @param {Function} fn 用户浏览器不支持全屏的回调
*/
constructor(fn) {
this.prefixName = ""; // 浏览器前缀
this.isFullscreenData = true; // 浏览器是否支持全屏
this.isFullscreen(fn);
}
/**
* @description: 将传进来的元素全屏
* @param {String} domName 要全屏的dom名称
*/
Fullscreen(domName) {
const element = document.querySelector(domName);
const methodName =
this.prefixName === "" ?
"requestFullscreen" :
`${this.prefixName}RequestFullScreen`;
element[methodName]();
}
// 退出全屏
exitFullscreen() {
const methodName =
this.prefixName === "" ?
"exitFullscreen" :
`${this.prefixName}ExitFullscreen`;
document[methodName]();
}
/**
* @description: 监听进入/离开全屏
* @param {Function} enter 进入全屏的回调
* @param {Function} quit 离开全屏的回调
*/
screenChange(enter, quit) {
if(!this.isFullscreenData) return;
const methodName = `on${this.prefixName}fullscreenchange`;
document[methodName] = e => {
if(this.isElementFullScreen()) {
enter && enter(e); // 进入全屏回调
} else {
quit && quit(e); // 离开全屏的回调
}
};
}
/**
* @description: 浏览器无法进入全屏时触发,可能是技术原因，也可能是用户拒绝：比如全屏请求不是在事件处理函数中调用,会在这里拦截到错误
* @param {Function} enterErrorFn 回调
*/
screenError(enterErrorFn) {
const methodName = `on${this.prefixName}fullscreenerror`;
document[methodName] = e => {
enterErrorFn && enterErrorFn(e);
};
}
/**
* @description: 是否支持全屏+判断浏览器前缀
* @param {Function} fn 不支持全屏的回调函数 这里设了一个默认值
*/
isFullscreen(fn) {
let fullscreenEnabled;
// 判断浏览器前缀
if(document.fullscreenEnabled) {
fullscreenEnabled = document.fullscreenEnabled;
} else if(document.webkitFullscreenEnabled) {
fullscreenEnabled = document.webkitFullscreenEnabled;
this.prefixName = "webkit";
} else if(document.mozFullScreenEnabled) {
fullscreenEnabled = document.mozFullScreenEnabled;
this.prefixName = "moz";
} else if(document.msFullscreenEnabled) {
fullscreenEnabled = document.msFullscreenEnabled;
this.prefixName = "ms";
}
if(!fullscreenEnabled) {
this.isFullscreenData = false;
fn && fn(); // 执行不支持全屏的回调
}
}
/**
* @description: 检测有没有元素处于全屏状态
* @return 布尔值
*/
isElementFullScreen() {
const fullscreenElement =
document.fullscreenElement ||
document.msFullscreenElement ||
document.mozFullScreenElement ||
document.webkitFullscreenElement;
if(fullscreenElement === null) {
return false; // 当前没有元素在全屏状态
} else {
return true; // 有元素在全屏状态
}
}
}
let full = new fullScreen(() => {
console.log("不支持");
});
full.screenError(e => {
console.log("进去全屏失败:", e);
});
// 全屏请求必须在事件处理函数中调用，否则将会被拒绝。
full.Fullscreen(".left"); // 触发进去全屏失败回调
const obj = {
enter: e => {
// 如果退出全屏 退出的还是全屏状态，将会触发进入全屏的回调，这种情况比较少 注意一下
console.log("进入全屏", e);
},
quit: e => {
console.log("退出全屏", e);
// 通常不会出现嵌套的情况
}
};
full.screenChange(obj.enter, obj.quit);
function leftScreen() {
full.Fullscreen(".left");
}
function rightScreen() {
full.Fullscreen(".right");
}
function redScreen() {
full.Fullscreen(".left-son");
}
// 退出全屏 退出到上次的状态
function exitScreen() {
full.exitFullscreen();
}
</script>
</html>