code: function(buttonOption) {
          buttonOption = buttonOption || [];
          var bottom = this.$container.find('.biz-panel-bottom'),
              self = this;
          bottom.find('button').bizButton('destroy').off().remove();
          $.each(buttonOption, function(index, buttonOption) {
              var button = $('<button></button>').appendTo(bottom).bizButton(buttonOption);
              if (buttonOption.onClick) {
                  button.click(function(e) {
                      buttonOption.onClick.call(self, e);
                  });
              }
          });
      }
docs: 更新按钮
  @param {Array} buttonOption 底部按钮的 option 数组