观察者TCP通信对接，实时列表优化，观察者模式界面显示逻辑

Assets/Scripts/Apis/MapApi.cs

@@ -145,6 +145,14 @@ namespace Assets.Scripts.Apis
             //CultureInfo.InvariantCulture
             var result = await GetAsync<JsonResult<object>>($"Map/GetEarthData?lat={ lat.ToString(CultureInfo.InvariantCulture) }&lon={ lon.ToString(CultureInfo.InvariantCulture) }");
 
+            return result;
+        }
+        //获取Loading页面路书封面图
+        public async Task<JsonResult<string>> GetMapLoadingCoverageUrl(int routeId)
+        {
+            //CultureInfo.InvariantCulture
+            var result = await GetAsync<JsonResult<string>>($"Map/GetMapLoadingCoverage?id={ routeId }");
+
             return result;
         }
     }