code: function matchDatum(node, datum, ignored) {
      var subFilter;
      for (var i in datum) {
        if (ignored !== i && (subFilter = filters[i]) && !subFilter(node, datum[i])) {
          return false;
        }
      }
      return true;
    }
docs: 这里主要是整合之前的ExpandsFilter中的mathch, 单层数据