问如何在Dart中使用swiffy swf javascript库和JsObject Interrop来运行SWF动画？

EN

    var DOMElement = document. getElementById("#Html5logo")
    var JSonString = {/*JSon swiffy annimation*/}

    Swiffy.Stage(DOMElement,JSonString)
    Swiffy.Start();

  //Grab the DOMElement with querySelector('#ID') or $['ID']
  Element html5DivContainer = $['html5logo'];

  //Put JSon Swiffy Logo into a MAP
  Map html5logoJSon = {/*Valid JSonObject*/}

  //Load swiffy Javascript library by using context JsObject Interrop from Dart
  JsObject swiffy = context['swiffy'];

  //This test is ok in my case.
  if(swiffy.hasProperty('Stage')){
    print('Swiffy well loaded and Stage methods is found.');
  }

  //TRY 01 : Try to load Stage Methods by parsing my DOMElement and my jsify Swiffy JSon Object.
  //
  // Result as an Exception :
  //    TypeError: Object #<Object> has no method 'Xe'
  //    CtrlHeader.CtrlHeader.created (http://127.0.0.1:3030/MySwiffyExample/web/ctrlheader.dart:19:24)
  swiffy.callMethod('Stage', [html5DivContainer,new JsObject.jsify(html5logoJSon)]);

  //TRY 02 : Try to load Stage Methods by parsing my jsify DOMElement and my jsify Swiffy JSon Object.
  //
  // Result as an Exception :
  //    Exception: Illegal argument(s): object must be a Map or Iterable
  //    CtrlHeader.CtrlHeader.created (http://127.0.0.1:3030/MySwiffyExample/web/ctrlheader.dart:33:39)
  swiffy.callMethod('Stage', [new JsObject.jsify(html5DivContainer),new JsObject.jsify(html5logoJSon)]);

  //Any idea??

  http://www.gstatic.com/swiffy/v5.4/runtime.js