$('#alarm-fullscreen-toggler').on('click', function(e) {
		var element = document.documentElement;
		if (!$('body').hasClass("full-screen")) {
			$('body').addClass("full-screen");
			$('#alarm-fullscreen-toggler').addClass("active");
			if (element.requestFullscreen) {
				element.requestFullscreen();
			} else if (element.mozRequestFullScreen) {
				element.mozRequestFullScreen();
			} else if (element.webkitRequestFullscreen) {
				element.webkitRequestFullscreen();
			} else if (element.msRequestFullscreen) {
				element.msRequestFullscreen();
			}

		} else {
			$('body').removeClass("full-screen");
			$('#alarm-fullscreen-toggler').removeClass("active");
			if (document.exitFullscreen) {
				document.exitFullscreen();
			} else if (document.mozCancelFullScreen) {
				document.mozCancelFullScreen();
			} else if (document.webkitCancelFullScreen) {
				document.webkitCancelFullScreen();
			} else if (document.msExitFullscreen) {
				document.msExitFullscreen();
			}

		}
	});
 

var el = document.documentElement;
    var rfs = el.requestFullScreen || el.webkitRequestFullScreen || el.mozRequestFullScreen || el.msRequestFullScreen;
    if (typeof rfs != "undefined" && rfs) {
        rfs.call(el);
    } else if (typeof window.ActiveXObject != "undefined") {
        var wscript = new ActiveXObject("WScript.Shell");
        if (wscript != null) {
            wscript.SendKeys("{F11}");
        }
    }

全屏方法2：

var docElm = document.documentElement;
    //W3C  
    if (docElm.requestFullscreen) {
        docElm.requestFullscreen();
    }
        //FireFox  
    else if (docElm.mozRequestFullScreen) {
        docElm.mozRequestFullScreen();
    }
        //Chrome等  
    else if (docElm.webkitRequestFullScreen) {
        docElm.webkitRequestFullScreen();
    }
        //IE11
    else if (elem.msRequestFullscreen) {
        elem.msRequestFullscreen();
    }

退出全屏：

    if (document.exitFullscreen) {
        document.exitFullscreen();
    }
    else if (document.mozCancelFullScreen) {
        document.mozCancelFullScreen();
    }
    else if (document.webkitCancelFullScreen) {
        document.webkitCancelFullScreen();
    }
    else if (document.msExitFullscreen) {
        document.msExitFullscreen();
    }