JS控制浏览器全屏

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function fullScreen() {
    var el = document.documentElement,
        rfs = el.requestFullScreen || el.webkitRequestFullScreen || el.mozRequestFullScreen || el.msRequestFullScreen,
        wscript;
  
    if(typeof rfs != "undefined" && rfs) {
        rfs.call(el);
        return;
    }
  
    if(typeof window.ActiveXObject != "undefined") {
        wscript = new ActiveXObject("WScript.Shell");
        if(wscript) {
            wscript.SendKeys("{F11}");
        }
    }
}
  
function exitFullScreen() {
    var el = document,
        cfs = el.cancelFullScreen || el.webkitCancelFullScreen || el.mozCancelFullScreen || el.exitFullScreen,
        wscript;
  
    if (typeof cfs != "undefined" && cfs) {
      cfs.call(el);
      return;
    }
  
    if (typeof window.ActiveXObject != "undefined") {
        wscript = new ActiveXObject("WScript.Shell");
        if (wscript != null) {
            wscript.SendKeys("{F11}");
        }
  }
}