js实现全屏和退出全屏

//全屏
function fullScreen(){
    var el = document.documentElement;
    var rfs = el.requestFullScreen || el.webkitRequestFullScreen || el.mozRequestFullScreen || el.msRequestFullScreen;

    //typeof rfs != "undefined" && rfs
    if (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
        var wscript = new ActiveXObject("WScript.Shell");
        if (wscript != null) {
            wscript.SendKeys("{F11}");
        }
    }
}

//退出全屏
function exitScreen(){
    var el = document;
    var cfs = el.cancelFullScreen || el.webkitCancelFullScreen ||     
    el.mozCancelFullScreen || el.exitFullScreen;

    //typeof cfs != "undefined" && cfs
    if (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
        var wscript = new ActiveXObject("WScript.Shell");
        if (wscript != null) {
            wscript.SendKeys("{F11}");
        }
    }

　　转载自：https://blog.csdn.net/qq_27870421/article/details/89890459