update：面案例代码结构的修改

src/examples/graphicElement/plane/plane-function.js

-export function addPlane() {
-    const script = document.createElement('script');
-    script.src = 'https://cesium.com/downloads/cesiumjs/releases/1.99/Build/Cesium/Cesium.js';
-    script.onload = () => {
-        window.Cesium.Ion.defaultAccessToken = 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJqdGkiOiI3Njg4ZWU5Yi1iZDhiLTRhYmUtOTRiYS04YjM5NmUwNjVmMDMiLCJpZCI6MjI3MzQ3LCJpYXQiOjE3MjA1MjA4Mjh9.E5XW4LnwgfVAaBC-znaYr61m4yK0-j2qEQhi9qwFFPE'
-
-        const viewer = new window.Cesium.Viewer('cesiumContainer', {
-            infoBox: false,
-        });
-
-        const czml = [
-            {
-              id: "document",
-              name: "CZML Colors",
-              version: "1.0",
+export function addPlane(viewer) {
+    const czml = [
+        {
+          id: "document",
+          name: "CZML Colors",
+          version: "1.0",
+        },
+        {
+          id: "rgba",
+          name: "Rectangle with outline using RGBA Colors",
+          rectangle: {
+            coordinates: {
+              wsenDegrees: [-120, 40, -110, 50],
             },
-            {
-              id: "rgba",
-              name: "Rectangle with outline using RGBA Colors",
-              rectangle: {
-                coordinates: {
-                  wsenDegrees: [-120, 40, -110, 50],
-                },
-                fill: true,
-                material: {
-                  solidColor: {
-                    color: {
-                      rgba: [255, 0, 0, 100],
-                    },
-                  },
-                },
-                height: 0, // disables ground clamping, needed for outlines
-                outline: true,
-                outlineColor: {
-                  rgba: [0, 0, 0, 255],
+            fill: true,
+            material: {
+              solidColor: {
+                color: {
+                  rgba: [255, 0, 0, 100],
                 },
               },
             },
-            {
-              id: "rgbaf",
-              name: "Rectangle using RGBAF Colors",
-              rectangle: {
-                coordinates: { wsenDegrees: [-100, 40, -90, 50] },
-                fill: true,
-                material: {
-                  solidColor: {
-                    color: {
-                      rgbaf: [1, 0, 0, 0.39],
-                    },
-                  },
-                },
-                height: 0, // disables ground clamping, needed for outlines
-                outline: true,
-                outlineColor: {
-                  rgba: [0, 0, 0, 255],
+            height: 0, // disables ground clamping, needed for outlines
+            outline: true,
+            outlineColor: {
+              rgba: [0, 0, 0, 255],
+            },
+          },
+        },
+        {
+          id: "rgbaf",
+          name: "Rectangle using RGBAF Colors",
+          rectangle: {
+            coordinates: { wsenDegrees: [-100, 40, -90, 50] },
+            fill: true,
+            material: {
+              solidColor: {
+                color: {
+                  rgbaf: [1, 0, 0, 0.39],
                 },
               },
             },
-          ];
-          
-          const dataSourcePromise = Cesium.CzmlDataSource.load(czml);
-          viewer.dataSources.add(dataSourcePromise);
-          viewer.zoomTo(dataSourcePromise); 
-    };
-    document.head.appendChild(script);
-
-    const link = document.createElement('link');
-    link.rel = 'stylesheet';
-    link.href = 'https://cesium.com/downloads/cesiumjs/releases/1.119/Build/Cesium/Widgets/widgets.css';
-    document.head.appendChild(link);
+            height: 0, // disables ground clamping, needed for outlines
+            outline: true,
+            outlineColor: {
+              rgba: [0, 0, 0, 255],
+            },
+          },
+        },
+      ];
+      
+      const dataSourcePromise = Cesium.CzmlDataSource.load(czml);
+      viewer.dataSources.add(dataSourcePromise);
+      viewer.zoomTo(dataSourcePromise); 
 }

src/examples/graphicElement/plane/plane.vue

 <template>
     <div id="cesiumContainer" class="cesium-container"></div>
 </template>
+
 <script setup>
 import { onMounted } from 'vue';
 import { addPlane } from './function';
+
+let viewer;
+
 onMounted(() => {
-    addPlane()
+    const script = document.createElement('script');
+    script.src = 'https://cesium.com/downloads/cesiumjs/releases/1.99/Build/Cesium/Cesium.js';
+    script.onload = () => {
+        window.Cesium.Ion.defaultAccessToken = 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJqdGkiOiI3Njg4ZWU5Yi1iZDhiLTRhYmUtOTRiYS04YjM5NmUwNjVmMDMiLCJpZCI6MjI3MzQ3LCJpYXQiOjE3MjA1MjA4Mjh9.E5XW4LnwgfVAaBC-znaYr61m4yK0-j2qEQhi9qwFFPE'
+
+        viewer = new window.Cesium.Viewer('cesiumContainer', {
+            infoBox: false,
+        });
+
+        addPlane(viewer)
+
+    };
+    document.head.appendChild(script);
+    const link = document.createElement('link');
+    link.rel = 'stylesheet';
+    link.href = 'https://cesium.com/downloads/cesiumjs/releases/1.119/Build/Cesium/Widgets/widgets.css';
+    document.head.appendChild(link);
 });
 </script>
 
 <style>
 .cesium-container {
-width: 100%;
-height: 100vh;
+    width: 100%;
+    height: 100vh;
 }
 </style>
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