code: function() {
  			var self = this;
  			if (self.disposed) return;
  			self.panel.classList.remove($.className('active'));
  			self.mask.close();
  			document.body.classList.remove($.className('poppicker-active-for-page'));
  			//处理物理返回键
  			$.back=self.__back;
  		}
docs: 隐藏