update：矩形空间网格案例代码的修改

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

-export function addRectangularSpaceGrid() {
-    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'
+export function addRectangularSpaceGrid(viewer) {
+    // 定义矩形的中心位置和尺寸
+    const center = Cesium.Cartesian3.fromDegrees(120, 30);
+    const width = 200000; // 矩形的宽度，单位为米
+    const height = 200000; // 矩形的高度，单位为米
 
-        const viewer = new window.Cesium.Viewer('cesiumContainer', {
-            infoBox: false,
-        });
-
-        // 定义矩形的中心位置和尺寸
-        const center = Cesium.Cartesian3.fromDegrees(120, 30);
-        const width = 200000; // 矩形的宽度，单位为米
-        const height = 200000; // 矩形的高度，单位为米
-
-        // 定义网格参数
-        const numHorizontalLines = 10; // 水平线数量
-        const numVerticalLines = 10; // 垂直线数量
+    // 定义网格参数
+    const numHorizontalLines = 10; // 水平线数量
+    const numVerticalLines = 10; // 垂直线数量
 
-        // 计算每个网格单元的大小
-        const horizontalSpacing = width / numHorizontalLines;
-        const verticalSpacing = height / numVerticalLines;
-
-        // 创建水平线
-        for (let i = 0; i <= numHorizontalLines; i++) {
-            const yOffset = (i - numHorizontalLines / 2) * horizontalSpacing;
-            const startPoint = Cesium.Cartesian3.add(
-                center,
-                new Cesium.Cartesian3(-width / 2, yOffset, 0),
-                new Cesium.Cartesian3()
-            );
-            const endPoint = Cesium.Cartesian3.add(
-                center,
-                new Cesium.Cartesian3(width / 2, yOffset, 0),
-                new Cesium.Cartesian3()
-            );
-            viewer.entities.add({
-                name: `Horizontal Line ${i}`,
-                polyline: {
-                    positions: [startPoint, endPoint],
-                    width: 1,
-                    material: Cesium.Color.WHITE
-                }
-            });
-        }
+    // 计算每个网格单元的大小
+    const horizontalSpacing = width / numHorizontalLines;
+    const verticalSpacing = height / numVerticalLines;
 
-        // 创建垂直线
-        for (let i = 0; i <= numVerticalLines; i++) {
-            const xOffset = (i - numVerticalLines / 2) * verticalSpacing;
-            const startPoint = Cesium.Cartesian3.add(
-                center,
-                new Cesium.Cartesian3(xOffset, -height / 2, 0),
-                new Cesium.Cartesian3()
-            );
-            const endPoint = Cesium.Cartesian3.add(
-                center,
-                new Cesium.Cartesian3(xOffset, height / 2, 0),
-                new Cesium.Cartesian3()
-            );
-            viewer.entities.add({
-                name: `Vertical Line ${i}`,
-                polyline: {
-                    positions: [startPoint, endPoint],
-                    width: 1,
-                    material: Cesium.Color.WHITE
-                }
-            });
-        }
+    // 创建水平线
+    for (let i = 0; i <= numHorizontalLines; i++) {
+        const yOffset = (i - numHorizontalLines / 2) * horizontalSpacing;
+        const startPoint = Cesium.Cartesian3.add(
+            center,
+            new Cesium.Cartesian3(-width / 2, yOffset, 0),
+            new Cesium.Cartesian3()
+        );
+        const endPoint = Cesium.Cartesian3.add(
+            center,
+            new Cesium.Cartesian3(width / 2, yOffset, 0),
+            new Cesium.Cartesian3()
+        );
+        viewer.entities.add({
+            name: `Horizontal Line ${i}`,
+            polyline: {
+                positions: [startPoint, endPoint],
+                width: 1,
+                material: Cesium.Color.WHITE
+            }
+        });
+    }
 
-        viewer.camera.flyTo({
-            destination: Cesium.Cartesian3.fromDegrees(120, 30, 300000),
-            orientation: {
-                heading: Cesium.Math.toRadians(0),
-                pitch: Cesium.Math.toRadians(-90),
-                roll: 0.0
+    // 创建垂直线
+    for (let i = 0; i <= numVerticalLines; i++) {
+        const xOffset = (i - numVerticalLines / 2) * verticalSpacing;
+        const startPoint = Cesium.Cartesian3.add(
+            center,
+            new Cesium.Cartesian3(xOffset, -height / 2, 0),
+            new Cesium.Cartesian3()
+        );
+        const endPoint = Cesium.Cartesian3.add(
+            center,
+            new Cesium.Cartesian3(xOffset, height / 2, 0),
+            new Cesium.Cartesian3()
+        );
+        viewer.entities.add({
+            name: `Vertical Line ${i}`,
+            polyline: {
+                positions: [startPoint, endPoint],
+                width: 1,
+                material: Cesium.Color.WHITE
             }
         });
-    };
-    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.flyTo({
+        destination: Cesium.Cartesian3.fromDegrees(120, 30, 300000),
+        orientation: {
+            heading: Cesium.Math.toRadians(0),
+            pitch: Cesium.Math.toRadians(-90),
+            roll: 0.0
+        }
+    });
 }

src/examples/sceneSet/rectangularSpaceGrid/rectangularSpaceGrid.vue

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