调整实体渲染顺序：标记便签始终在城市/国家名上层

src/scene/CesiumGlobe.js

@@ -114,6 +114,36 @@ export class CesiumGlobe {
     if (this._created) return;
     this._created = true;
 
+    // 调整实体渲染顺序：先渲染标签（城市/国家名），再渲染 Billboard（标记便签），
+    // 让词条标记始终显示在城市/国家名的上层。
+    Cesium.DataSourceDisplay.defaultVisualizersCallback = function (
+      scene,
+      entityCluster,
+      dataSource,
+    ) {
+      const entities = dataSource.entities;
+      return [
+        new Cesium.LabelVisualizer(entityCluster, entities),
+        new Cesium.BillboardVisualizer(entityCluster, entities),
+        new Cesium.GeometryVisualizer(
+          scene,
+          entities,
+          dataSource._primitives,
+          dataSource._groundPrimitives,
+        ),
+        new Cesium.ModelVisualizer(scene, entities),
+        new Cesium.Cesium3DTilesetVisualizer(scene, entities),
+        new Cesium.PointVisualizer(entityCluster, entities),
+        new Cesium.PathVisualizer(scene, entities),
+        new Cesium.PolylineVisualizer(
+          scene,
+          entities,
+          dataSource._primitives,
+          dataSource._groundPrimitives,
+        ),
+      ];
+    };
+
     const container = document.getElementById('cesium-container');
 
     this.viewer = new Cesium.Viewer(container, {