fix：修复车船gps运动错误的问题

src/hooks/map.js

@@ -2,6 +2,7 @@ import { ref } from 'vue'
 
 export function useMap() {
   let map = ref(null)
+  let marker = ref(null)
   // 初始化地图
   const initMap = (id, lat, lng, scale = 15, satellite) => {
     map.value = new BMapGL.Map(id)
@@ -24,13 +25,13 @@ export function useMap() {
     })
     var point = new BMapGL.Point(...position)
     // 创建标注对象并添加到地图
-    var marker = new BMapGL.Marker(point, { icon: iconPath })
-    map.value.addOverlay(marker)
+    marker.value = new BMapGL.Marker(point, { icon: iconPath })
+    map.value.addOverlay(marker.value)
   }
   // 清除覆盖物
   const clearOverlays = () => {
     map.value.clearOverlays()
   }
 
-  return { map, initMap, addMarker, clearOverlays }
+  return { map, marker, initMap, addMarker, clearOverlays }
 }