JS实现全屏和退出全屏

<button id="fullScreenBtn">进入全屏</button>
<button id="exitFullScreenBtn">退出全屏</button>

// 进入全屏
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
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();
    }
}
 
// 按钮点击事件
document.getElementById('fullScreenBtn').addEventListener('click', function() {
    requestFullScreen(document.documentElement);
});
 
document.getElementById('exitFullScreenBtn').addEventListener('click', function() {
    exitFullScreen();
});