fireguestures手势发送快捷键ALT+F1的脚本怎么写

var evt = document.createEvent("KeyEvents");
evt.initKeyEvent(
  "keypress",
  true,
  true,
  null,
  false,  // holds Ctrl key
  true,  // holds Alt key
  false,  // holds Shift key
  false,  // holds Meta key
  evt.DOM_VK_F1,  // presses a special key, @see http://mxr.mozilla.org/mozilla/source/dom/public/idl/events/nsIDOMKeyEvent.idl
  0  // presses a normal key, e.g. "A".charCodeAt(0),
);
document.documentElement.dispatchEvent(evt);