放大缩小按钮层级调整

src/components/Viewer/smViewer.scss

@@ -36,7 +36,7 @@
     font-size: 20px;
     z-index: 98;
     cursor: pointer;
-    z-index: 9999;
+    z-index: 101;
 }
 
 .cesium-viewer-timelineContainer {