update：天空盒案例代码结构的修改

src/examples/sceneSet/skyBox/skyBox-function.js

-export function addSkyBox() {
-    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,
-        });
-
-        // 定义图片的URL
-        const imageUrls = {
-            positiveX: 'https://raw.githubusercontent.com/jinlinchao123/Cesium-assets/main/tycho2t3_80_px.jpg',
-            negativeX: 'https://raw.githubusercontent.com/jinlinchao123/Cesium-assets/main/tycho2t3_80_mx.jpg',
-            positiveY: 'https://raw.githubusercontent.com/jinlinchao123/Cesium-assets/main/tycho2t3_80_py.jpg',
-            negativeY: 'https://raw.githubusercontent.com/jinlinchao123/Cesium-assets/main/tycho2t3_80_my.jpg',
-            positiveZ: 'https://raw.githubusercontent.com/jinlinchao123/Cesium-assets/main/tycho2t3_80_pz.jpg',
-            negativeZ: 'https://raw.githubusercontent.com/jinlinchao123/Cesium-assets/main/tycho2t3_80_mz.jpg',
-        };
+export function addSkyBox(viewer) {
+    // 定义图片的URL
+    const imageUrls = {
+        positiveX: 'https://raw.githubusercontent.com/jinlinchao123/Cesium-assets/main/tycho2t3_80_px.jpg',
+        negativeX: 'https://raw.githubusercontent.com/jinlinchao123/Cesium-assets/main/tycho2t3_80_mx.jpg',
+        positiveY: 'https://raw.githubusercontent.com/jinlinchao123/Cesium-assets/main/tycho2t3_80_py.jpg',
+        negativeY: 'https://raw.githubusercontent.com/jinlinchao123/Cesium-assets/main/tycho2t3_80_my.jpg',
+        positiveZ: 'https://raw.githubusercontent.com/jinlinchao123/Cesium-assets/main/tycho2t3_80_pz.jpg',
+        negativeZ: 'https://raw.githubusercontent.com/jinlinchao123/Cesium-assets/main/tycho2t3_80_mz.jpg',
+    };
 
-        // 异步加载图片
-        async function loadImages() {
-            const sources = {};
-            for (const [key, url] of Object.entries(imageUrls)) {
-                const response = await fetch(url);
-                const blob = await response.blob();
-                const imageUrl = URL.createObjectURL(blob);
-                sources[key] = imageUrl;
-            }
-            return sources;
+    // 异步加载图片
+    async function loadImages() {
+        const sources = {};
+        for (const [key, url] of Object.entries(imageUrls)) {
+            const response = await fetch(url);
+            const blob = await response.blob();
+            const imageUrl = URL.createObjectURL(blob);
+            sources[key] = imageUrl;
         }
+        return sources;
+    }
 
-        // 设置SkyBox
-        loadImages().then(sources => {
-            viewer.scene.skyBox = new Cesium.SkyBox({
-                sources: sources
-            });
+    // 设置SkyBox
+    loadImages().then(sources => {
+        viewer.scene.skyBox = new Cesium.SkyBox({
+            sources: sources
         });
-        
-    };
-    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);
+    });
 }

src/examples/sceneSet/skyBox/skyBox.vue

 <template>
     <div id="cesiumContainer" class="cesium-container"></div>
 </template>
+
 <script setup>
 import { onMounted } from 'vue';
 import { addSkyBox } from './function';
+
+let viewer;
+
 onMounted(() => {
-    addSkyBox()
+    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,
+        });
+
+        addSkyBox(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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