/**网页全屏*/
function requestFullScreen(element) {
  var requestMethod = element.requestFullScreen || element.webkitRequestFullScreen || element.mozRequestFullScreen || element.msRequestFullScreen;
  if (requestMethod) {
    requestMethod.call(element);
  } else if (typeof window.ActiveXObject !== "undefined") {
    var wscript = new ActiveXObject("WScript.Shell");
    if (wscript !== null) {
      wscript.SendKeys("{F11}");
    }
  }
}
/**退出全屏 */
function cancelFullScreen() {
  if (document.cancelFullScreen) {
    document.cancelFullScreen();
  } else if (document.mozCancelFullScreen) {
    document.mozCancelFullScreen();
  } else if (document.webkitCancelFullScreen) {
    document.webkitCancelFullScreen();
  }
}