用陷阱重写ES6类行为

经过一番修修补补,我已经或多或少地实现了我所希望的目标

const EventEmitter = require( 'events' );

class SyncedObject extends EventEmitter { 
  constructor( obj ) {
    super();
    this._object = obj;

    return new Proxy( this, {
      set: ( object, key, value, proxy ) => {
        if( this._object[key] === value )
          return false;

        this._object[key] = value;
        if( key[0] === '_') {
            var eventArgs = {
              propertyName: key,
              oldValue: object[key],
              newValue: value
            };
            this.emit( 'propertyChanged', eventArgs );
        }

        return true;
      },
      get: ( object, key ) => {
        return this._object[key] || object[key];
      }
    });
  }

  silentUpdate( data ) {
    for(var i = 0, keys = Object.keys(data); i < keys.length; i++)
      this._object[keys[i]] = data[keys[i]];
  }

}

不是最防弹的解决方案(EventEmitter属性引发事件),但对于我需要的,它可能会起作用。如果有人有改进建议,请发帖子。我暂时不回答这个问题。