code: function (path) {
          if (!(path instanceof Array)) {
              path = [path];
          }
          var len = path.length;
          var appendSize = 0;
          var offset = this._len;
          for (var i = 0; i < len; i++) {
              appendSize += path[i].len();
          }
          if (hasTypedArray && (this.data instanceof Float32Array)) {
              this.data = new Float32Array(offset + appendSize);
          }
          for (var i = 0; i < len; i++) {
              var appendPathData = path[i].data;
              for (var k = 0; k < appendPathData.length; k++) {
                  this.data[offset++] = appendPathData[k];
              }
          }
          this._len = offset;
      }
docs: 添加子路径
  @param {module:zrender/core/PathProxy|Array.<module:zrender/core/PathProxy>} path