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code/container-ocr/ocr-uniapp/src/utils/tdl-loader.ts

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+import { toast } from './toast'
+
+let tdtLoaded = false
+let tdtLoadCallbacks: ((T: typeof window.T) => void)[] = []
+
+const mapKey = import.meta.env.VITE_TIANDITU_MAP_KEY
+
+export function loadTianDiTu(onLoadedCallback?: (T: typeof window.T) => void) {
+  if (tdtLoaded && window.T) {
+    onLoadedCallback?.(window.T)
+    return
+  }
+
+  if (onLoadedCallback)
+    tdtLoadCallbacks.push(onLoadedCallback)
+
+  if (document.querySelector(`script[src*="tianditu.gov.cn/api"]`))
+    return
+
+  const script = document.createElement('script')
+  script.src = `https://api.tianditu.gov.cn/api?v=4.0&tk=${mapKey}`
+  script.onload = () => {
+    if (!window.T) {
+      console.error('天地图脚本加载成功，但 T 不存在')
+      return
+    }
+
+    tdtLoaded = true
+    tdtLoadCallbacks.forEach(cb => cb(window.T!))
+    tdtLoadCallbacks = []
+  }
+  script.onerror = () => {
+    console.error('天地图脚本加载失败')
+    tdtLoadCallbacks = []
+  }
+
+  document.head.appendChild(script)
+}
+
+export async function getAddressByPoint(lon: number, lat: number): Promise<string> {
+  return new Promise((resolve, reject) => {
+    loadTianDiTu((T) => {
+      try {
+        const geocoder = new T.Geocoder()
+
+        geocoder.getLocation(new T.LngLat(lon, lat), (res: any) => {
+          try {
+            const addr = res.formatted_address
+            const comp = res.addressComponent || {}
+
+            if (!addr) {
+              const parts = [
+                comp.nation,
+                comp.province,
+                comp.city,
+                comp.county,
+                comp.road,
+                comp.poi || comp.address,
+              ].filter(Boolean)
+
+              resolve(parts.join(' '))
+            }
+            else {
+              resolve(addr)
+            }
+          }
+          catch (err) {
+            reject(err)
+          }
+        })
+      }
+      catch (err) {
+        reject(err)
+      }
+    })
+  })
+}
+
+export async function getPoint(): Promise<{ lon: number, lat: number } | null> {
+  return new Promise((resolve, reject) => {
+    uni.getLocation({
+      type: 'wgs84',
+      success(res) {
+        console.log(res)
+
+        const lon = res.longitude
+        const lat = res.latitude
+
+        if (!lon || !lat || (lon === 0 && lat === 0)) {
+          resolve(null) // 无效坐标返回 null
+        }
+        else {
+          resolve({ lon, lat })
+        }
+      },
+      fail(err) {
+        console.error('获取定位失败', err)
+        resolve(null) // 定位失败也返回 null，调用方可以判断
+      },
+    })
+  })
+}
+
+export interface CurrentLocation {
+  lon: number
+  lat: number
+  address: string
+}
+
+/**
+ * 获取当前位置及对应地址（自动处理错误和提示）
+ * @returns 如果成功返回位置信息，否则返回 null（已自动 toast 提示）
+ */
+export function getCurrentLocation(): Promise<CurrentLocation | null> {
+  return getPoint()
+    .then((point) => {
+      if (!point) {
+        return null
+      }
+
+      return getAddressByPoint(point.lon, point.lat).then(address => ({
+        lon: point.lon,
+        lat: point.lat,
+        address,
+      }))
+    })
+    .catch((err) => {
+      console.error('[getCurrentLocation] 获取位置失败:', err)
+      return null
+    })
+    .finally(() => {
+      console.log('[getCurrentLocation] 操作完成')
+    })
+}
+
+export async function getDrive(points: number[][], style: string = '0') {
+  loadTianDiTu((T) => {
+    const drivingRoute = new T.DrivingRoute(null)
+  })
+}