code: function _getInterPath(points) {
    var path = [];
    Util.each(points, function (point, index) {
      var subPath = index === 0 ? ['M', point.x, point.y] : ['L', point.x, point.y];
      path.push(subPath);
    });
    return path;
  }
docs: 插值的图形path，不考虑null