update：水面案例代码的修改

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

-export function addWaterSurface() {
-    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.primitives.add(
-            new Cesium.Primitive({
-                geometryInstances: new Cesium.GeometryInstance({
-                    geometry: new Cesium.RectangleGeometry({
-                        rectangle: Cesium.Rectangle.fromDegrees(
-                            100,
-                            30,
-                            101,
-                            31
-                        ),
-                        vertexFormat: Cesium.EllipsoidSurfaceAppearance.VERTEX_FORMAT,
-                        height: 0,
-                    }),
+export function addWaterSurface(viewer) {
+    viewer.scene.primitives.add(
+        new Cesium.Primitive({
+            geometryInstances: new Cesium.GeometryInstance({
+                geometry: new Cesium.RectangleGeometry({
+                    rectangle: Cesium.Rectangle.fromDegrees(
+                        100,
+                        30,
+                        101,
+                        31
+                    ),
+                    vertexFormat: Cesium.EllipsoidSurfaceAppearance.VERTEX_FORMAT,
+                    height: 0,
                 }),
-                appearance: new Cesium.EllipsoidSurfaceAppearance({
-                    material: new Cesium.Material({
-                        fabric: {
-                            type: "Water",
-                            uniforms: {
-                                baseWaterColor: new Cesium.Color(
-                                    64 / 255.0,
-                                    157 / 255.0,
-                                    253 / 255.0,
-                                    0.6
-                                ),
-                                normalMap: "https://webgishome-pic.oss-cn-chengdu.aliyuncs.com/cesium/waterMaterial.jpg",
-                                frequency: 1000.0,
-                                animationSpeed: 0.1,
-                                amplitude: 10,
-                                specularIntensity: 8,
-                            },
+            }),
+            appearance: new Cesium.EllipsoidSurfaceAppearance({
+                material: new Cesium.Material({
+                    fabric: {
+                        type: "Water",
+                        uniforms: {
+                            baseWaterColor: new Cesium.Color(
+                                64 / 255.0,
+                                157 / 255.0,
+                                253 / 255.0,
+                                0.6
+                            ),
+                            normalMap: "https://webgishome-pic.oss-cn-chengdu.aliyuncs.com/cesium/waterMaterial.jpg",
+                            frequency: 1000.0,
+                            animationSpeed: 0.1,
+                            amplitude: 10,
+                            specularIntensity: 8,
                         },
-                    }),
+                    },
                 }),
-            })
-        );
-
-        viewer.camera.setView({
-            destination: Cesium.Cartesian3.fromDegrees(100.5, 30.5, 150000),
-            orientation: {
-                heading: 6.283185, //相机绕z轴旋转。左右摇头。
-                pitch: 30, //相机绕y轴旋转。上下点头。
-                roll: 0.0, //相机绕x轴旋转。左右歪头。
-            },
-        });
-    };
-    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);
+    viewer.camera.setView({
+        destination: Cesium.Cartesian3.fromDegrees(100.5, 30.5, 150000),
+        orientation: {
+            heading: 6.283185, //相机绕z轴旋转。左右摇头。
+            pitch: 30, //相机绕y轴旋转。上下点头。
+            roll: 0.0, //相机绕x轴旋转。左右歪头。
+        },
+    });
 }

src/examples/weather/waterSurface/waterSurface.vue

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