code: function (element) {
              var self = this;
              var $el = self.$el;    // 隐藏当然不包含了
              // 隐藏当然不包含了
              if (!self.get('visible') || !$el) {
                  return false;
              }
              if ($el && ($el[0] === element || $el.contains(element))) {
                  return true;
              }
              var children = self.get('children');
              for (var i = 0, count = children.length; i < count; i++) {
                  var child = children[i];
                  if (child.containsElement && child.containsElement(element)) {
                      return true;
                  }
              }
              return false;
          }
docs: Whether this menu contains specified html element.
  @param {KISSY.Node} element html Element to be tested.
  @return {Boolean}
  @protected