获取EXTJS中的FormPanel的所有控件值和属性

BookPanel.items.each(function(item,index,length){                           
                           alert(item.getName());
                           alert(item.initialConfig.name);
                           alert(item.initialConfig.id);
                           alert(item.initialConfig.emptyText);
                           alert(item.getValue());
                           alert(item.getXType());
  });