浏览器全屏切换

/**
 * 全屏切换
 * @returns 
 */
const fullscreen = () => {
    // 是否可以切换到全屏状态
    let enabled = document.fullscreenEnabled || document.mozFullScreenEnabled || document.webkitFullscreenEnabled || document.msFullscreenEnabled;
    if (!!enabled !== true) return ltNotify.danger("此终端不支持全屏");

    // fullscreenElement属性返回正处于全屏状态的Element节点，如果当前没有节点处于全屏状态，则返回null。
    let element = document.fullscreenElement || document.mozFullScreenElement || document.webkitFullscreenElement;

    if (!!element) {
        if (document.exitFullscreen) document.exitFullscreen();
        else if (document.msExitFullscreen) document.msExitFullscreen();
        else if (document.mozCancelFullScreen) document.mozCancelFullScreen();
        else if (document.webkitExitFullscreen) document.webkitExitFullscreen();
        else console.error("此终端不支持全屏");
    } else {
        element = document.documentElement;
        if (element.requestFullscreen) element.requestFullscreen();
        else if (element.mozRequestFullScreen) element.mozRequestFullScreen();
        else if (element.msRequestFullscreen) element.msRequestFullscreen();
        else if (element.webkitRequestFullscreen) element.webkitRequestFullScreen();
        else console.error("此终端不支持全屏");
    };
};