code: function Checkbox(checkbox, options) {
      this.main = checkbox;
      this.$main = $(this.main);
      // 同组选项
      this.$group = $('input[name="' + this.$main.attr('name') + '"]');
  
      var defaultOption = {
          theme: window.bizui.theme
      };
      this.options = $.extend(defaultOption, options || {});
      this.init(this.options);
  }
docs: Checkbox
  @class
  @param {HTMLElement} checkbox        目标元素
  @param {Object}      [options]       参数
  @param {String}      [options.theme] 主题