浏览器全屏事件(Html5)

        <button onclick="launchFullscreen(document.documentElement);"></button>
        function launchFullscreen(element) {
            if (element.requestFullscreen) {
                element.requestFullscreen();
            } else if (element.mozRequestFullScreen) {
                element.mozRequestFullScreen();
            } else if (element.webkitRequestFullscreen) {
                element.webkitRequestFullscreen();
            } else if (element.msRequestFullscreen) {
                element.msRequestFullscreen();
            }
        }