js控制浏览器全屏

function fullScreen() {    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") {        // for Internet Explorer        var wscript = new ActiveXObject("WScript.Shell");        if (wscript != null) {            wscript.SendKeys("{F11}");        }    }}