如何管理图层的显示顺序

Question

groupLayerMarker始终位于其他图层下，因此用户看不到标记

1. 地图收藏集：[]
2. 我获取数据并创建groupLayerMarker groupLayerMarker：[layerMarker，layerMarker，...] 集合：[groupLayerMarker]，
3. 加载layerOsm
   集合：[groupLayerMarker，layerOsm]，
4. 使用属性layer =“”加载地图layerWMS 集合：[groupLayerMarker，layerOsm]，（layer =“”，因此集合中没有layerWMS。

5. 用户从layerWMS（layer =“ layerName_1”）选择带有layerName_1的复选框
   集合：[groupLayerMarker，layerOsm，layerWms]，

   addAllMarkersLayer() {
   const markersGroup = new LayerGroup({
       layers: [],
       name: 'marker',
       id: 4
   });
   this.map.addLayer(markersGroup);
   markersGroup.setZIndex(markersGroup.get('id'));
   

   }

   addLayers(mLayersComponent: QueryList < MLayersComponent > ) {
   const results = first < any > (mLayersComponent.toArray());
   forEach(results, result => {
       if (result && result.length > 0) {
           result.forEach(map => {
               map.layer$.subscribe(newLayer => {
                   if (newLayer) {
                       this.removeOldLayers(newLayer);
                       this.map.addLayer(newLayer);
                   }
               });
           });
       }
   });
   

   }

   removeOldLayers(newLayer) {
   const newLayerName = newLayer.get('name');
   const allLayers = this.map.getLayers();
   allLayers.forEach(existingLayer => {
       if (existingLayer && existingLayer.get('name') === newLayerName) {
           this.map.removeLayer(existingLayer);
       }
   });
   

   }

我试图添加zIndex将groupLayerMarker移到顶部 集合：[layerOsm，layerWms，groupLayerMarker]。

将来我需要添加另一个图层，例如layerRoads 订单应为： 集合：[layerOsm，layerWms，layerWMTS，groupLayerRoads，groupLayerMarker]

问题：如何管理图层？