使用元素全屏如何做到设置与监听

//全屏设置
 $('#fullScreen').on('click', function () {
 fullScreen();
 });
 //退出全屏
 $('#exitFullScreen').on('click', function () {
 exitFullScreen();
 });
 //进入全屏
function fullScreen() {
 var obj = document.getElementById('editMark');
 if (obj.requestFullScreen) {
 obj.requestFullScreen();
 } else if (obj.webkitRequestFullScreen) {
 obj.webkitRequestFullScreen();
 } else if (obj.msRequestFullScreen) {
 obj.msRequestFullScreen();
 } else if (obj.mozRequestFullScreen) {
 obj.mozRequestFullScreen();
 }
}

function exitFullScreen() {
 var obj = document.getElementById('editMark');
 if (document.exitFullscree) {
 document.exitFullscree();
 } else if (document.webkitExitFullscreen) {
 document.webkitExitFullscreen();
 } else if (document.msExitFullscreen) {
 document.msExitFullscreen();
 } else if (document.mozCancelFullScreen) {
 document.mozCancelFullScreen();
 }
}

//监听全屏
 document.addEventListener('fullscreenchange', function () {
 if (document.fullscreenElement) {
 alert(1);
 } else {
 alert(2);
 }
 }, false);
 document.addEventListener('msfullscreenchange', function () {
 if (document.msFullscreenElement) {
 alert(1);
 } else {
 alert(2);
 }
 }, false);
 document.addEventListener('mozfullscreenchange', function () {
 if (document.mozFullScreen) {
 alert(1);
 } else {
 alert(2);
 }
 }, false);
 document.addEventListener('webkitfullscreenchange', function () {
 if (document.webkitIsFullScreen) {
 alert(1);
 } else {
 alert(2);
 }
 }, false);