绘制geojson

 toLatLng(coords) {
      return L.CRS.EPSG3857.unproject(L.point(coords))
    },
    onEachFeature(feature, layer) {
      layer.on({
         // mouseover: (d) => {
         //   debugger
         // },
         // mouseout: () => {
         //   debugger
         // },
         click: () => {
           if (currentCityLayer) {
             currentCityLayer.setStyle(defaultCityStyle)
           }
           if (currentCityLayer === layer) {
             return
           }
           layer.setStyle(selectCityStyle)
           currentCityLayer = layer
         },
       })
    },
    drawArea(data) {
      const options = {
        onEachFeature: this.onEachFeature,
        style: {
          fillColor: '#ff0000',
          weight: 2,
          opacity: 0.8,
          color: 'white',
          dashArray: '3',
          fillOpacity: 0.8
        },
        coordsToLatLng: this.toLatLng
      }
      let layer = L.geoJson(data, options)
      layer.addTo(map)
    },