code: function Switch(switchDom, options) {
      this.main = switchDom;
      this.$main = $(this.main);
  
      var defaultOption = {
          theme: window.bizui.theme
      };
      this.options = $.extend(defaultOption, options || {});
      this.init(this.options);
  }
docs: Switch
  @class
  @param {HTMLElement} switchDom       目标元素
  @param {Object}      [options]       参数
  @param {String}      [options.theme] 主题