docs: function Tab(tab, options) {
      this.main = tab;
      this.$main = $(this.main);
  
      var defaultOption = {
          action: 'click',
          customClass: '',
          selectedIndex: 0,
          theme: window.bizui.theme
      };
      this.options = $.extend(defaultOption, options || {});
      this.init(this.options);
  }