全屏方法1：

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();     }