docs: function Panel(panel, options) {
      this.main = panel;
      this.$main = $(this.main);
  
      var defaultOption = {
          customClass: '',
          marginLeft: 200,
          speed: 300,
          theme: window.bizui.theme,
          title: '',
          buttons: [],
          destroyOnClose: false
      };
      this.options = $.extend(defaultOption, options || {});
      this.init(this.options);
  }