fireKeyEvent.js

//来源：http://www.cnblogs.com/Random/archive/2013/03/29/2989789.html
function fireKeyEvent(el, evtType, keyCode){
    var evtObj;
    
    if(document.createEvent){
      if( window.KeyEvent ) {
        evtObj = document.createEvent('KeyEvents');
        evtObj.initKeyEvent( evtType, true, true, window, false, false, false, false, keyCode, 0 );
      } else {
        evtObj = document.createEvent('UIEvents');
        evtObj.initUIEvent( evtType, true, true, window, 1 );
        delete evtObj.keyCode;
        
        if(typeof evtObj.keyCode === "undefined"){
          Object.defineProperty(evtObj,"keyCode",{value:keyCode});
        }else{
          evtObj.key=String.fromCharCode(keyCode);
        }
      }
      el.dispatchEvent(evtObj);
      
    }else if(document.createEventObject){
      evtObj = document.createEventObject();
      evtObj.keyCode=keyCode;
      el.fireEvent('on'+evtType, evtObj);
    }
}