arcgis的vue2怎么刷新地图

要在Vue2中使用ArcGIS API for JavaScript刷新地图，可以使用以下步骤：

1. 在Vue组件中引入ArcGIS API for JavaScript，并在`mounted`生命周期钩子中初始化地图：

import { loadModules } from 'esri-loader';

export default {
  name: 'MapComponent',
  data() {
    return {
      map: null,
      view: null,
      layer: null,
    }
  },
  mounted() {
    this.initMap();
  },
  methods: {
    async initMap() {
      // Load the ArcGIS API for JavaScript modules
      const [Map, MapView, FeatureLayer] = await loadModules(['esri/Map', 'esri/views/MapView', 'esri/layers/FeatureLayer']);

      // Create the map
      this.map = new Map({
        basemap: 'streets-navigation-vector'
      });

      // Create the view
      this.view = new MapView({
        container: this.$refs.mapContainer,
        map: this.map,
        center: [-118.244, 34.052],
        zoom: 12
      });

      // Create the layer
      this.layer = new FeatureLayer({
        url: 'https://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/LA_County_City_Facilities/FeatureServer/0',
        outFields: ['*'],
        popupTemplate: {
          title: '{NAME}',
          content: [{
            type: 'fields',
            fieldInfos: [{
              fieldName: 'CITY_NAME',
              label: 'City'
            }, {
              fieldName: 'ZIP',
              label: 'ZIP Code'
            }]
          }]
        }
      });

      // Add the layer to the map
      this.map.add(this.layer);
    },
    refreshMap() {
      // Refresh the layer
      this.layer.refresh();
    }
  }
}

2. 在Vue模板中添加地图容器和刷新按钮：

<template>
  <div>
    <div ref="mapContainer" style="height: 500px;"></div>
    <button @click="refreshMap">Refresh Map</button>
  </div>
</template>

3. 在刷新按钮的点击事件中调用刷新方法：

<button @click="refreshMap">Refresh Map</button>

...

methods: {
  refreshMap() {
    // Refresh the layer
    this.layer.refresh();
  }
}

这样就可以在Vue2中使用ArcGIS API for JavaScript刷新地图了。