update：雾案例代码的修改

src/examples/weather/fog/fog-function.js

-export function addFog() {
-    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,
-        });
-
-        viewer.scene.postProcessStages.add(new Cesium.PostProcessStage({
-            fragmentShader: `
-                    uniform sampler2D colorTexture;
-                    uniform sampler2D depthTexture;
-                    uniform float visibility;
-                    uniform vec4 fogColor;
-                    varying vec2 v_textureCoordinates; 
-                    varying vec4 fragColor;
-                    void main(void) 
-                    { 
-                         vec4 origcolor = texture2D(colorTexture, v_textureCoordinates);
-                        float depth = czm_readDepth(depthTexture, v_textureCoordinates); 
-                        vec4 depthcolor = texture2D(depthTexture, v_textureCoordinates);
-                        float f = visibility * (depthcolor.r - 0.3) / 0.2; 
-                        if (f < 0.0) f = 0.0; 
-                        else if (f > 1.0) f = 1.0; 
-                        gl_FragColor = mix(origcolor, fogColor, f);
-                    }
-                `,
-            uniforms: {
-                visibility: 0.1,
-                fogColor: new Cesium.Color(0.8, 0.8, 0.8, 0.8),
-            },
-        }));     
-    };
-    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);
+export function addFog(viewer) {
+    viewer.scene.postProcessStages.add(new Cesium.PostProcessStage({
+        fragmentShader: `
+                uniform sampler2D colorTexture;
+                uniform sampler2D depthTexture;
+                uniform float visibility;
+                uniform vec4 fogColor;
+                varying vec2 v_textureCoordinates; 
+                varying vec4 fragColor;
+                void main(void) 
+                { 
+                        vec4 origcolor = texture2D(colorTexture, v_textureCoordinates);
+                    float depth = czm_readDepth(depthTexture, v_textureCoordinates); 
+                    vec4 depthcolor = texture2D(depthTexture, v_textureCoordinates);
+                    float f = visibility * (depthcolor.r - 0.3) / 0.2; 
+                    if (f < 0.0) f = 0.0; 
+                    else if (f > 1.0) f = 1.0; 
+                    gl_FragColor = mix(origcolor, fogColor, f);
+                }
+            `,
+        uniforms: {
+            visibility: 0.1,
+            fogColor: new Cesium.Color(0.8, 0.8, 0.8, 0.8),
+        },
+    }));     
 }

src/examples/weather/fog/fog.vue

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