webOS水平滚动器不起作用

function MainAssistant(argFromPusher) {
}

MainAssistant.prototype = {
   setup: function() {
      Ares.setupSceneAssistant(this);
      Mojo.Event.listen(this.controller.get(\'scrollto\'), Mojo.Event.tap, this.scrolltoTap.bindAsEventListener(this));
      this.controller.setupWidget(\"scrollerId\", {
                   mode: \'horizontal-snap\'
               }, this.model = {
                   snapElements: { x: $$(\'.scrollerItem\') },
                   snapIndex: 0
               }
        );
   },

   cleanup: function() {
      Ares.cleanupSceneAssistant(this);
   }
};

MainAssistant.prototype.scrolltoTap = function(singleTapEvent){
   //this.controller.get(\'scrollerId\').mojo.scrollTo(1024, undefined, false, false);   
   Mojo.Log.info(\'SCROLL POSITION---\');
   var sc = this.controller.get(\'scrollerId\');
   Mojo.Log.info(sc.mojo.getScrollPosition().left);
   sc.mojo.scrollTo(-2048);
   Mojo.Log.info(\'New SCROLL POSITION---\');
   Mojo.Log.info(sc.mojo.getScrollPosition().left);
}

com.example.pptest Info: SCROLL POSITION---, palmInitFramework367:2569
com.example.pptest Info: -1024, palmInitFramework367:2569
com.example.pptest Info: New SCROLL POSITION---, palmInitFramework367:2569
com.example.pptest Info: -2048, palmInitFramework367:2569
com.example.pptest =========> Calling palmInitFramework367, file:///usr/palm/frameworks/mojo/mojo.js:142
com.example.pptest Info: Requested submission : 367, palmInitFramework367:2569
com.example.pptest Info: Current locale is en_us, palmInitFramework367:2569
com.example.pptest Info: About to activate scene  main, palmInitFramework367:2569
com.example.pptest Info: Transition ended., palmInitFramework367:25