update：多颜色线案例代码结构的修改

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

-export function addMultiLine() {
-    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 Geometries: Polyline",
-              version: "1.0",
-            },
-            {
-              id: "redLine",
-              name: "Red line clamped to terain",
-              polyline: {
-                positions: {
-                  cartographicDegrees: [-75, 35, 0, -125, 35, 0],
-                },
-                material: {
-                  solidColor: {
-                    color: {
-                      rgba: [255, 0, 0, 255],
-                    },
-                  },
-                },
-                width: 5,
-                clampToGround: true,
+export function addMultiLine(viewer) {
+  const czml = [
+      {
+        id: "document",
+        name: "CZML Geometries: Polyline",
+        version: "1.0",
+      },
+      {
+        id: "redLine",
+        name: "Red line clamped to terain",
+        polyline: {
+          positions: {
+            cartographicDegrees: [-75, 35, 0, -125, 35, 0],
+          },
+          material: {
+            solidColor: {
+              color: {
+                rgba: [255, 0, 0, 255],
               },
             },
-            {
-              id: "blueLine",
-              name: "Glowing blue line on the surface",
-              polyline: {
-                positions: {
-                  cartographicDegrees: [-75, 37, 0, -125, 37, 0],
-                },
-                material: {
-                  polylineGlow: {
-                    color: {
-                      rgba: [100, 149, 237, 255],
-                    },
-                    glowPower: 0.2,
-                    taperPower: 0.5,
-                  },
-                },
-                width: 10,
+          },
+          width: 5,
+          clampToGround: true,
+        },
+      },
+      {
+        id: "blueLine",
+        name: "Glowing blue line on the surface",
+        polyline: {
+          positions: {
+            cartographicDegrees: [-75, 37, 0, -125, 37, 0],
+          },
+          material: {
+            polylineGlow: {
+              color: {
+                rgba: [100, 149, 237, 255],
               },
+              glowPower: 0.2,
+              taperPower: 0.5,
             },
-            {
-              id: "orangeLine",
-              name:
-                "Orange line with black outline at height and following the surface",
-              polyline: {
-                positions: {
-                  cartographicDegrees: [-75, 39, 250000, -125, 39, 250000],
-                },
-                material: {
-                  polylineOutline: {
-                    color: {
-                      rgba: [255, 165, 0, 255],
-                    },
-                    outlineColor: {
-                      rgba: [0, 0, 0, 255],
-                    },
-                    outlineWidth: 2,
-                  },
-                },
-                width: 5,
+          },
+          width: 10,
+        },
+      },
+      {
+        id: "orangeLine",
+        name:
+          "Orange line with black outline at height and following the surface",
+        polyline: {
+          positions: {
+            cartographicDegrees: [-75, 39, 250000, -125, 39, 250000],
+          },
+          material: {
+            polylineOutline: {
+              color: {
+                rgba: [255, 165, 0, 255],
+              },
+              outlineColor: {
+                rgba: [0, 0, 0, 255],
               },
+              outlineWidth: 2,
             },
-            {
-              id: "dashedLine",
-              name: "Blue dashed line",
-              polyline: {
-                positions: {
-                  cartographicDegrees: [-75, 45, 500000, -125, 45, 500000],
-                },
-                material: {
-                  polylineDash: {
-                    color: {
-                      rgba: [0, 255, 255, 255],
-                    },
-                  },
-                },
-                width: 4,
+          },
+          width: 5,
+        },
+      },
+      {
+        id: "dashedLine",
+        name: "Blue dashed line",
+        polyline: {
+          positions: {
+            cartographicDegrees: [-75, 45, 500000, -125, 45, 500000],
+          },
+          material: {
+            polylineDash: {
+              color: {
+                rgba: [0, 255, 255, 255],
               },
             },
-          ];
-          
-          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);
+          },
+          width: 4,
+        },
+      },
+    ];
+    
+    const dataSourcePromise = Cesium.CzmlDataSource.load(czml);
+    viewer.dataSources.add(dataSourcePromise);
+    viewer.zoomTo(dataSourcePromise);          
 }

src/examples/graphicElement/multiLine/multiLine.vue

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