门面（外观）模式

DED.util.Event = {

  getEvent: function(e) {

    return e || window.event;

  },

  getTarget: function(e) {

    return e.target || e.srcElement;

  },

  stopPropagation: function(e) {

    if (e.stopPropagation) {

      e.stopPropagation();

    } 

    else {

      e.cancelBubble = true;

    }

  },

  preventDefault: function(e) {

    if (e.preventDefault) {

      e.preventDefault();

    } 

    else {

      e.returnValue = false;

    }

  },

  stopEvent: function(e) {

    this.stopPropagation(e);

    this.preventDefault(e);

  }

};



addEvent($('example'), 'click', function(e) {

  // Who clicked me.

  console.log(DED.util.Event.getTarget(e));

  // Stop propgating and prevent the default action.

  DED.util.Event.stopEvent(e);

});