code: function() {
      this._latlngs = [];
      this._resultsModel = null;
      this._measureVertexes.clearLayers();
      if (this._measureDrag) {
        this._layer.removeLayer(this._measureDrag);
      }
      if (this._measureArea) {
        this._layer.removeLayer(this._measureArea);
      }
      if (this._measureBoundary) {
        this._layer.removeLayer(this._measureBoundary);
      }
      this._measureDrag = null;
      this._measureArea = null;
      this._measureBoundary = null;
    }
docs: clear all running measure data