求告知如何创建一个地图

import { MapComponent, mapCommon, map } from '@kit.MapKit';
import { AsyncCallback } from '@kit.BasicServicesKit';

@Entry
@Component
struct BasicMapDemo {
  private mapOptions?: mapCommon.MapOptions;
  private callback?: AsyncCallback<map.MapComponentController>;
  private mapController?: map.MapComponentController;

  aboutToAppear(): void {
     // 地图初始化参数，设置地图中心点坐标及层级
     let target: mapCommon.LatLng = {
        latitude: 39.9181,
        longitude: 116.3970193
     }
     let cameraPosition: mapCommon.CameraPosition = {
        target: target,
        zoom: 15
      }
     this.mapOptions = {
        position: cameraPosition
     }

     // 地图初始化的回调
     this.callback = async (err, mapController) => {
        if (!err) {
          this.mapController = mapController;
          // 初始化marker（标记）参数
          let markerOptions: mapCommon.MarkerOptions = {
            position: {
              latitude: 39.9181,
              longitude: 116.3970193
            }
          };
          // 新建一个默认的marker图标
          await this.mapController?.addMarker(markerOptions);
        }
     }
  }

  build() {
    Stack() {
        // 调用MapComponent组件初始化地图
        MapComponent({ mapOptions: this.mapOptions, mapCallback: this.callback }).width('100%').height('100%');
    }.height('100%')
  }
}
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