docs: function(callback) {
                      var fontList = FontManager.getFontList(), count = 0, _self = this;
                      kity.Utils.each(fontList, function(fontInfo) {
                          count++;
                          fontInfo.meta.src = _self.resource + fontInfo.meta.src;
                          _self.createFontStyle(fontInfo);
                          preload(_self.doc, fontInfo, function() {
                              count--;
                              if (count === 0) {
                                  complete(_self.doc, callback);
                              }
                          });
                      });
                  }