code: function getTotalMatrix() {
      var m = this._cfg.totalMatrix;
      if (!m) {
        m = [1, 0, 0, 0, 1, 0, 0, 0, 1];
        var parent = this._cfg.parent;
        if (parent) {
          var pm = parent.getTotalMatrix();
          multiple(m, pm);
        }
  
        multiple(m, this.attr('matrix'));
        this._cfg.totalMatrix = m;
      }
      return m;
    }
docs: 应用到当前元素上的总的矩阵
  @return {Matrix} 矩阵