Leaflet绘制多边形

this.map = L.map('map').setView([51.505, -0.09], 13);

drawPolygon = () => {
    let points = [];

    const polygon = new L.Polygon(points);
    this.map.addLayer(polygon);

    this.map.on('mousedown', e => {
      points.push([e.latlng.lat, e.latlng.lng]);

      this.map.on('mousemove', event => {
        polygon.setLatLngs([...points,[event.latlng.lat, event.latlng.lng]])
      });
    });

    this.map.on('dblclick', () => {
      if (points.length) {
        this.map.off('mousemove');
        points = [];
      }
    });
  };