js | 点击触发浏览器全屏显示【 requestFullscreen()】

MDN文档：https://developer.mozilla.org/zh-CN/docs/Web/API/Element/requestFullScreen

        let fullscreen;
        let fsEnter = document.getElementById('fullscr');
        fsEnter.addEventListener('click', function(e) {
            e.preventDefault();
            if (!fullscreen) {
                fullscreen = true;
                document.documentElement.requestFullscreen();
                fsEnter.innerHTML = "Exit Fullscreen";
            } else {
                fullscreen = false;
                document.exitFullscreen();
                fsEnter.innerHTML = "Go Fullscreen";
            }
        });