js实现页面全屏展示

检查浏览器是否支持Fullscreen API

// 检查是否支持全屏模式
function isFullScreen() {return document.fullscreenElement ||document.webkitFullscreenElement ||document.mozFullScreenElement ||document.msFullscreenElement;
}

全屏模式

获取Element节点，然后使用requestFullscreen方法，可以使得这个节点全屏，全屏模式的具体实现可能因浏览器而异，所以要做不同浏览器处理

function requestFullScreen(element) {if (element.requestFullscreen) {element.requestFullscreen();} else if (element.mozRequestFullScreen) {element.mozRequestFullScreen();} else if (element.webkitRequestFullscreen) {element.webkitRequestFullscreen();} else if (element.msRequestFullscreen) {element.msRequestFullscreen();}
}

退出全屏

退出全屏模式可以通过调用document.exitFullscreen()方法实现。这个方法会尝试让当前处于全屏模式的元素退出全屏。用户手动按下ESC键，也可以退出全屏键。

function exitFullScreen() {if (document.exitFullscreen) {document.exitFullscreen();} else if (document.mozCancelFullScreen) {document.mozCancelFullScreen();} else if (document.webkitExitFullscreen) {document.webkitExitFullscreen();} else if (document.msExitFullscreen) {document.msExitFullscreen();}
}

为按钮添加点击事件，实现点击后页面全屏

<button id="fullscreen-btn">切换全屏</button>

document.getElementById('fullscreen-btn').addEventListener('click', function() {var elem = document.documentElement; // 获取html元素if (!isFullScreen()) {requestFullScreen(elem);} else {exitFullScreen();}
});