超完整的全屏显示方法

代码如下
<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <title></title>
</head>

<body>
  <button onclick="fullScreen()">现代浏览器全屏</button>
  <button onclick="exitScreen()">现代浏览器退出</button>
  <button onclick="iefull()">低版本ie全屏</button>
</body>
<script type="text/javascript">
  //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);
    };
    return;
  }
  //退出全屏
  function exitScreen() {
    if (document.exitFullscreen) {
      document.exitFullscreen();
    }
    else if (document.mozCancelFullScreen) {
      document.mozCancelFullScreen();
    }
    else if (document.webkitCancelFullScreen) {
      document.webkitCancelFullScreen();
    }
    else if (document.msExitFullscreen) {
      document.msExitFullscreen();
    }
    if (typeof cfs != "undefined" && cfs) {
      cfs.call(el);
    }
  }
  //ie低版本的全屏，退出全屏都这个方法
  function iefull() {
    var el = document.documentElement;
    var rfs = el.msRequestFullScreen;
    if (typeof window.ActiveXObject != "undefined") {
      //这的方法 模拟f11键，使浏览器全屏
      var wscript = new ActiveXObject("WScript.Shell");
      if (wscript != null) {
        wscript.SendKeys("{F11}");
      }
    }
  }
  //注：ie调用ActiveX控件，需要在ie浏览器安全设置里面把 ‘未标记为可安全执行脚本的ActiveX控件初始化并执行脚本’ 设置为启用
</script>

</html>