f11 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 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}");
 
    }
 
  }
}
 
function exitFullScreen() {
 
  var el = document;
 
  var cfs = el.cancelFullScreen || el.webkitCancelFullScreen || 
 
      el.mozCancelFullScreen || el.exitFullScreen;
 
  if(typeof cfs != "undefined" && 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}");
 
    }
 
  }
}