js实现浏览器的全屏和退出全屏

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/*** 全屏*/let toFullScreen = () => {let el = document.documentElement;let rfs = el.requestFullScreen || el.webkitRequestFullScreen || el.mozRequestFullScreen || el.msRequestFullScreen;//typeof rfs != "undefined" && rfsif (rfs) {rfs.call(el);} else if (typeof window.ActiveXObject !== "undefined") {//for IE，这里其实就是模拟了按下键盘的F11，使浏览器全屏let wscript = new ActiveXObject("WScript.Shell");if (wscript != null) {wscript.SendKeys("{F11}");}} else {alert("浏览器不支持全屏");}}/*** 退出全屏*/let exitFullscreen = function () {let el = parent.document;let cfs = el.cancelFullScreen || el.webkitCancelFullScreen || el.mozCancelFullScreen || el.exitFullScreen;//typeof cfs != "undefined" && cfsif (cfs) {cfs.call(el);} else if (typeof window.ActiveXObject !== "undefined") {//for IE，这里和fullScreen相同，模拟按下F11键退出全屏let wscript = new ActiveXObject("WScript.Shell");if (wscript != null) {wscript.SendKeys("{F11}");}} else {alert("切换失败,可尝试Esc退出")}}