code: function() {
              W.lockScreen('Loading...');
              console.log('pre-caching...');
              W.preCache([
                  // Precache some pages for demonstration.
                  'languageSelection.html',
                  'quiz.html',
                  'questionnaire.html'
              ], function() {
                  console.log('Precache done.');
                  // Pre-Caching done; proceed to the next stage.
                  node.done();
              });
          }
docs: //////////////////////////////////////////// nodeGame hint:  Pages can be preloaded with this method: W.preCache()  The content of a URI is cached in an array, and loaded again from there when needed. Pages that embed JS code should be cached with caution. ///////////////////////////////////////////